Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?

(a)

\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS₂ and H₂S

(b)

\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide

(c)

Roasting of the sulphide to its oxide is thermodynamically feasible

(d)

Carbon and hydrogen are suitable reducing agents for metal sulphides

Match items in column - I with the items of column – II and assign the correct code.

Column-I		Column-II
A.	Cyanide process	(i)	Ultrapure Ge
B	Froth floatation process	(ii)	Dressing of ZnS
C	Electrolytic reduction	(iii)	Extraction of Al
D	Zone refining	(iv)	Extraction of Au
		(v)	Purification of Ni

(a)

A	B	C	D
(i)	(ii)	(iii)	(iv)

(b)

A	B	C	D
(iii)	(iv)	(v)	(i)

(c)

A	B	C	D
(iv)	(ii)	(iii)	(i)

(d)

A	B	C	D
(ii)	(iii)	(i)	(v)

Magnesite is_______.

(a)

Magnesium oxide

(b)

Magnesium carbonate

(c)

Magnesium sulphate

(d)

Magnesium chloride

The percentage of carbon in high carbon steel is_________.

(a)

0.5 - 1%

(b)

0.15 - 1.5%

(c)

0.15 - 1.5%

(d)

0.15 - 0.3%

In Hall-Heroult process ___________act as an anode.

(a)

Carbon blocks

(b)

hydrogen

(c)

copper rods

(d)

Zinc rods

Duralumin is an alloy of ______.

(a)

Cu, Mn

(b)

Cu, Al, Mg

(c)

Al, Mn

(d)

Al, Cu, Mn, Mg

Thermodynamically the most stable form of carbon is________.

(a)

Diamond

(b)

graphite

(c)

Fullerene

(d)

none of these

Identify the electron - deficient species

(a)

(BH₃)₂

(b)

(SiH₃)₂

(c)

PH₃

(d)

(CH₃)₂

Boron compounds behave as Lewis acid, because of their _______.

(a)

ionisation property

(b)

acidic nature

(c)

covalent nature

(d)

electron deficient nature

Borax is _______.

(a)

Na₂[B₄O₅(OH)₄).8H₂O

(b)

Na₂[B₄O₅(OH)₆).7H₂O

(c)

Na₂[B₄O₃(OH)₈].6H₂O

(d)

Na₂[B₄O₂(OH)₁₀).5H₂O

In the brown ring test, brown colour of the ring is due to _______.

(a)

a mixture of No and NO₂

(b)

Nitroso ferrous sulphate

(c)

Ferrous nitrate

(d)

Ferric nitrate

The correct order of the thermal stability of hydrogen halide is_______.

(a)

HI > HBr > HCl > HF

(b)

HF > HCl > HBr > HI

(c)

HCl > HF > HBr > HI

(d)

HI > HCl > HF > HBr

Allotrope of sulphur which shows paramagnetic behaviour _______.

(a)

S₈- Rhombic

(b)

S₈- Monoclinic

(c)

S₂- In vapour phase

(d)

Not possible

Which one of the following orders is not in accordance with the property stated against it?

(a)

F₂ > CI₂ > Br₂ > I₂: Bond dissociation energy

(b)

HI > HBr > HCI > HF: Acidic property in water

(c)

F₂ > Cl₂ > Br₂ > l₂: Oxidising power

(d)

F₂ > Cl₂ > Br₂ > l₂: Electronegativity

Strong reducing behaviour of H₃PO₂ is due to______.

(a)

High oxidation state of phosphorus

(b)

High electro gain enthalpy of phosphorus

(c)

Presence of two-OH groups and one P-H bond

(d)

Presence of one-OH groups and two P-H bonds

Permanganate ion changes to ________ in acidic medium.

(a)

MnO₄²⁻

(b)

Mn²⁺

(c)

Mn³⁺

(d)

MnO₂

Which one of the following statements related to lanthanons is incorrect?

(a)

Europium shows +2 oxidation state

(b)

The basicity decreases as the ionic radius decreases from Pr to Lu.

(c)

All the lanthanons are much more reactive than aluminium

(d)

Ce⁴⁺ solutions are widely used as oxidising agents in volumetric analysis.

CrO₃ is coloured due to_______.

(a)

Low L.E

(b)

Crystal defects

(c)

Charge transfer spectra

(d)

Unpaired electrons

On oxidation with KMnO₄ in acidic medium, SO₂ is oxidised to _______.

(a)

SO₂

(b)

H₂SO₄

(c)

SO₃^2-

(d)

H₂S

In black and white photography, the developed film is fixed by washing with ______.

(a)

Hypo solution

(b)

AgBr solution

(c)

Na₂S₄O₆ solution

(d)

FeC₂O₄ solution

Oxidation state of Iron and the charge on the ligand NO in [Fe(H₂O)₅NO]SO₄ are_______.

(a)

+2 and 0 respectively

(b)

+3 and 0 respectively

(c)

+3 and -1 respectively

(d)

+1 and +1 respectively

Which kind of isomerism is possible for a complex [Co(NH₃)₄Br₂]CI?

(a)

geometrical and ionization

(b)

geometrical and optical

(c)

optical and ionization

(d)

geometrical only

Which is a double salt?

(a)

K₂SO₄AI₂(SO₄)₃24H₂O

(b)

NaCI

(c)

K₄[Fe(CN)₆]

(d)

KCl

Pick out the central metal ion in the complex K₃[AI(C₂O₄)₃].

(a)

3K⁺

(b)

Al³⁺

(c)

C₂O₄^2-

(d)

both (a) and (b)

[Ni(Co)₄] is a________ complex.

(a)

anionic

(b)

cationic

(c)

neutral

(d)

ambidentate

The radius of an atom is 300pm, if it crystallizes in a face centered cubic lattice, the length of the edge of the unit cell is ________.

(a)

488.5pm

(b)

848.5pm

(c)

884.5pm

(d)

484.5pm

The fraction of total volume occupied by the atoms in a simple cubic is ________.

(a)

\(\left( \frac { \pi }{ 4\sqrt { 2 } } \right) \)

(b)

\(\left( \frac { \pi }{ 6 } \right) \)

(c)

\(\left( \frac { \pi }{ 4 } \right) \)

(d)

\(\left( \frac { \pi }{ 3\sqrt { 2 } } \right) \)

Graphite is a good conductor of electricity due to the presence of_______.

(a)

Lone pair of electrons

(b)

Free valence electrons

(c)

Cations

(d)

Anions

Iodine crystals are ________.

(a)

covalent

(b)

ionic

(c)

metallic

(d)

molecular

A cubic crystal has _______ faces.

(a)

2

(b)

4

(c)

6

(d)

8

The decomposition of phosphine (PH₃) on tungsten at low pressure is a first order reaction. It is because the _____.

(a)

rate is proportional to the surface coverage

(b)

rate is inversely proportional to the surface coverage

(c)

rate is independent of the surface coverage

(d)

rate of decomposition is slow

In a homogeneous reaction A⟶B+C+D, the initial pressure was P₀ and after time t it was P expression for rate constant in terms of P₀, P and t will be _____.

(a)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 2{ P }_{ 0 } }{ { 3P }_{ 0 }-P } \right) \)

(b)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { { 2P }_{ 0 } }{ { P }_{ 0 }-P } \right) \)

(c)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 3{ P }_{ 0 }-P }{ 2P_{ 0 } } \right) \)

(d)

\(k=\left( \frac { 2.303 }{ t } \right) \log\left( \frac { 2{ P }_{ 0 } }{ { 3P }_{ 0 }-2P } \right) \)

Which of the following statement is not correct?

(a)

Molecularity of a reaction cannot be fractional

(b)

Molecularity of a reaction cannot be more than three

(c)

Molecularity of a reaction can be zero

(d)

Molecularity is assigned for each elementary step of mechanism.

Compound A reacts by first order kineties. At 25^oC, the rate constant of the reaction is 0.60 sec. What is the half life of A?

(a)

1.15 sec

(b)

0.4158 sec

(c)

0.093 sec

(d)

1.29 sec

The oxidation of potassium iodide by potassium persulphate as per the rate law, rate k[K₂S₂O₈] [K1]. The order with respect to potassium iodide is, _______.

(a)

two

(b)

one

(c)

three

(d)

four

What is the pH of the resulting solution when equal volumes of 0.1M NaOH and 0.01M HCl are mixed?

(a)

2.0

(b)

3

(c)

7.0

(d)

12.65

Which of the following can act as Lowery – Bronsted acid well as base?

(a)

HCl

(b)

SO₄²⁻

(c)

HPO₄²⁻

(d)

Br^-

The relationship between degree of dissociation of a weak acid and its dissociation constant in a very dilute solution is _______.

(a)

K_a = α²C

(b)

K_a = \(\frac{α^2C}{(1+α)}\)

(c)

K_a = \(\frac{α^2}{(1+α)C}\)

(d)

K_a = \(\frac{α}{C(1+α)}\)

pH of buffer depends upon concentration of _______.

(a)

acid (H⁺)

(b)

Conjugate base (OH^-)

(c)

Salt

(d)

acid (H⁺) and Conjugate base (OH^-)

NH₄OH is a weak base because _______.

(a)

it has low vapour pressure

(b)

it is only partially ionised

(c)

it is completely ionised

(d)

it has low density

Among the following cells
I) Leclanche cell
II) Nickel – Cadmium cell
III) Lead storage battery
IV) Mercury cell
Primary cells are ____.

(a)

I and IV

(b)

I and III

(c)

III and IV

(d)

II and III

In H₂-O₂ fuel cell the reaction occur at cathode is _______.

(a)

O_2(g) + 2H₂O_(l) + 4e^- ⟶ 4OH⁻ _(aq)

(b)

H⁺(aq) + OH⁻ (aq) ⟶ H₂O (l)

(c)

2H₂ (g) + O₂ (g) ⟶ 2H₂O (g)

(d)

H⁺ + e^- ⟶ 1/2 H₂

Faraday's laws of electrolysis are related to ______.

(a)

atomic number of the cation

(b)

atomic number of the anion

(c)

equivalent weight of the electrolyte

(d)

speed of the cation

The feasibility of a redox reaction can be predicted with the help of ______.

(a)

Electronegativity

(b)

Electrochemical series

(c)

Electron affinity

(d)

Equivalent conductance

1 F equals to _____.

(a)

96500 moles

(b)

96500 C

(c)

1.6 x 10^-19 C

(d)

1.6 x 10^-19 moles

Which of the following is incorrect for physisorption?

(a)

reversible

(b)

increases with increase in temperature

(c)

low heat of adsorption

(d)

increases with increase in surface area

On which of the following properties does the coagulating power of an ion depend?

(a)

Both magnitude and sign of the charge on the ion.

(b)

Size of the ion alone

(c)

the magnitude of the charge on the ion alone

(d)

the sign of charge on the ion alone.

The phenomenon of Tyndall's effect is not observed in _______.

(a)

emulsion

(b)

colloidal solution

(c)

true solution

(d)

none

A substance that enhances the catalytic activity of the catalyst is _______.

(a)

gel

(b)

sol

(c)

promoter

(d)

poison

The decomposition of hydrogen peroxide in the presence of colloidal platinum is a/an _______.

(a)

positive analysis

(b)

negative catalysis

(c)

auto-catalysis

(d)

induced catalysis

on treatment with Con H₂SO₄, predominately gives______.

(a)

(b)

(c)

(d)

Carbolic acid is _____.

(a)

Phenol

(b)

Picri cacid

(c)

benzoic acid

(d)

phenylacetic acid

Which is optically active?

(a)

n-butyl alcohol

(b)

isobutyl alcohol

(c)

2-butanol

(d)

t-butyl alcohol

The compound that acts as a solvent for Grignard reagent is ______.

(a)

Ethyl alcohol

(b)

Diethyl ether

(c)

Acetone

(d)

Benzene

In swern method of oxidation of alcohols to aldhedye/ ketones _______ is used as an oxidising agent.

(a)

dimethyl sulfoxide

(b)

pyridimium chloro chromate

(c)

CrO₃ in anhydrousmedium

(d)

Na₂Cr₂O₇ |H⁺

Ethanoic acid \(\overset { P/{ Br }_{ 2 } }{ \longrightarrow } \) 2-bromoethanoic acid. This reaction is called _______.

(a)

Finkelstein reaction

(b)

Haloform reaction

(c)

Hell – Volhard – Zelinsky reaction

(d)

none of these

An alkene “A” on reaction with O₃ and Zn - H₂O gives propanone and ethanol in equimolar ratio. Addition of HCl to alkene “A” gives “B” as the major product. The structure of product “B” is ______.

(a)

\(Cl-{ CH }_{ 2 }-CH_{ 2 }-\overset { \overset { CH_{ 3 } }{ | } }{ \underset { \underset { CH_{ 3 } }{ | } }{ CH } } \)

(b)

\({ H }_{ 3 }C-{ CH }_{ 2 }-\overset { \overset { CH_{ 2 }Cl }{ | } }{ CH } -{ CH }_{ 3 }\)

(c)

\(\\ { H }_{ 3 }C-{ CH }_{ 2 }-\overset { \overset { CH_{ 3 } }{ | } }{ \underset { \underset { CL{ } }{ | } }{ C } } -{ CH }_{ 3 }\)

(d)

\({ H }_{ 3 }C-{ CH }-\overset { \overset { CH_{ 3 } }{ | } }{ \underset { \underset { Cl }{ | } }{ C } } \)

Which of the following acids do not exhibit optical isomerism?

(a)

lactic acid

(b)

tartaric acid

(c)

maleic acid

(d)

both (a) and (b)

Which of the following does not give iodoform test?

(a)

aceto phenone

(b)

benzophenone

(c)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CHOH } \)

(d)

\({ CH }_{ 3 }-\underset { \overset { | }{ OH } }{ CH } -{ { CH }_{ 2 }{ CH }_{ 2 }-CH }_{ 3 }\)

Bakelite is a product of reaction between _______.

(a)

formaldehyde and NaOH

(b)

phenol and methanal

(c)

aniline and NaOH

(d)

aniline and NaOH

Which type of ores can be concentrated by froth floatation method? Give two examples for such ores.

Out of coke and CO, which is better reducing agent for the reduction of ZnO? Why?

The reaction \({ Cr }_{ 2 }{ O }_{ 3 }+2{ Al }_{ (s) }\longrightarrow { Al }_{ 2 }O_{ 3 }+2Cr\) \(\Delta { G }^{ 0 }=-421KJ\) is thermodynamically feasible why does it not take place at room temperature?

Define roasting.

Write a short note on anomalous properties of the first element of p-block.

What is catenation ? describe briefly the catenation property of carbon.

Give the uses of alum.

Which one is more soluble in diethyl ether, anhydrous Alcl₃ or hydrated Alcl₃? Explain in terms of bonding.

What is inert pair effect?

Give the uses of helium.

What is the reaction of Phosphorous with alkali?

Elements of group 16 show lower value of first ionization enthalpy compared to group 15, why?

What are inner transition elements?

Why Gd³⁺ is colourless?

Silver atom has completely filled d-orbitals (4d¹⁰) in its ground state. How can you say that it is a transition element?

Draw the structure of permanganate ion.

Arrange the following in order of increasing molar conductivity
(i) Mg[Cr(NH₃)(Cl)₅]
(ii) Cr(NH₃)₅Cl]₃[CoF₆]₂
(iii) [Cr(NH₃)₃Cl₃]

Based on VB theory explain why [Cr(NH₃)₆]³⁺ is paramagnetic, while [Ni(CN)₄]^2- is diamagnetic.

Give the geometry and magnetic character of [NiCI₄]^2-

What are structural isomers?

Why do solids have a definite volume?

Write a note on the assignment of atoms per unit cell in body centred cubic lattice or CsCl.

Define half life of a reaction. Show that for a first order reaction half life is independent of initial concentration.

Rate of chemical reaction is not uniform throughout. Justify you answer:

For a chemical reaction, Variation in the concentration In[A] Vs time in seconds is given as

(i) What is the order of the reaction?
(ii) What is the unit of rate constant K?
(iii) Give the relationship between k and \({ t }_{ \frac { 1 }{ 2 } }\)

The rate of the reaction X + 2y→ product is 4 x 10^-3 mol L^-1S^-1, if [X] = [Y] = 0.2M and rate constant at 400K is 2 x 10^-2s^-1, What is the overall order of the reaction.

A lab assistant prepared a solution by adding a calculated quantity of HCl gas 25⁰C to get a solution with [H₃O⁺] = 4\(\times\)10^-5M. Is the solution neutral (or) acidic (or) basic.

Calculate the pH of 0.001M HCl solution

Write down the conjugate acid and base of the following
(i) NH₃
(ii) HSO^-₄

BF₃ is termed as an acid though it does not contain H⁺ ions. Explain.

State Kohlrausch Law. How is it useful to determine the molar conductivity of weak electrolyte at infinite dilution.

Calculate the molar conductance of 0.025M aqueous solution of calcium chloride at 25°C. The specific conductance of calcium chloride is 12.04 x 10^-2 Sm^-1.

On dilution of 0.1 M of Na₂SO₄, what will happen to its
(a) Conductance (C)
(b) Conductivity K
(c) Molar conductance \({ \Lambda }_{ m }\)
(d) Equivalent conductance \({ \Lambda }\)

What is corrosion?

What is a dispersed phase and a dispersion I medium in a colloid?

What is electrophoresis? (or) Write a note on Electrophoresis.

Identify the product A and B.

Write the IUPAC names of
(i) CH₃OCH₂CH₂O
(ii) CH₃OCH₂OCH₃ and
(iii) 

What is urotropine? Give its use.

Identify (B), (C) and (D)
\({ CH }_{ 3 }-\overset { \underset { || }{ O } }{ C } -{ CH }_{ 3 }-(A)\overset { LIAIH_{ 4 } }{ \longrightarrow } (B)\overset { { SOCl }_{ 2 } }{ \longrightarrow } (C)\overset { alc.KOH }{ \longrightarrow } (D)\)

Using the Ellingham diagram,
(A) Predict the conditions under which
(i) Aluminium might be expected to reduce magnesia.
(ii) Magnesium could reduce alumina.
(B) it is possible to reduce Fe₂O₃ by coke at a temperature around 1200K

Mention the uses of copper.

Write a short note on hydroboration.

How is boron trifluoride obtained from boron trioxide?

Write the molecular formula and structural formula for the following molecules.
a) Nitric acid
b) Dinitrogen pentoxide
c) phosphoric acid (PTA)
d) phosphine

Explain the structure of ammonia.

What are interstitial compounds?

Discuss the general characteristic of the 3d series of the transition elements with special reference to their
(i) Atomic size
(ii) Enthalpies of atomisation

[Ni(CN)₄]^2- is diamagnetic, while [NiCl₄]^2- is paramagnetic, explain using crystal field theory. 

Explain optical isomerism.

How do the spacings of the three planes (100), (101) and (111) of simple cubic lattice vary?

The decomposition of NH₃ on platinum surface is zero order reaction what are the rates of production of N₂ and H₂ if k = 2.5 x10^-4 mol + L S^-1.

Show that in case of first order reaction, the time required for 99.9% completion is nearly ten times the time required for half completion of the reaction.

The K_a value for HCN is 10^-9. What is the pH of 0.4M HCN solution?

Based on Arrhenius concept, defame acid and bases and give an example for each.

A solution of silver nitrate is electrolysed for 20 minutes with a current of 2 amperes. Calculate the mass of silver deposited at the cathode.

Explain the process of recharging of lead storage battery.

Why are lyophillic colloidal sols are more stable than lyophobic colloidal sol.

Give any three application of adsorption.

How do primary, secondary and tertiary alcohols differ in terms of their oxidation?

When tertiary butyl alcohol and 1-butanol are separately treated with a few drops of KMnO₄, in one case only the purple colour disappears and a brown precipitate is formed. Which of the two alcohols gives the above reaction and what is that brown precipitate?

Explain Stephen's reaction.

How can you separate alumina from silica in a bauxite ore.

Distinguish between diamond and graphite.

An element A occupies group number 15 and period number 3, exhibits allotropy and it is tetra atomic. A reacts with caustic soda to give B which is having rotten fish odour. A reacts with chlorine to give C which has a pungent odour Identify A, B and C. Write the reactions.

Why is there a variation of atomic and ionic size as we move from Sc to Zn?

Give the IUPAC name for the following compounds.
(i) [Ag(NH₃)₂]CI
(ii) K₃[Fe(CN)₅NO]
(ill) [Cr(PPh₃)(CO)₃]
(iv) [Ag(NH₃)₂]⁺
(v) [FeF₆]^4-

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example.

A first order reaction laws on rate constant 1.15 x 10^-3 S^-1. How long will 5 g of this reactant take to reduce to 3g?

Calculate the pH of solution with HO⁺ concentrations in mol dm^-3.
(i) 10^-4
(ii) 10^-7
(iii) 6.8 x 10^-3
(iv) 3.2 x 10^-5
(v) 0.035
(vi) 0.25
(vii) 5.4 x 10^-9
(viii) 7.1 x 10^-7

Calculate the emf of the cell having the cell reaction 2Ag⁺ + Zn ⇌ 2Ag + Zn²⁺ and E^o_cell = 1.56 V at 25°C when concentration of Zn²⁺ = 0.1 M and Ag⁺ = 10 M in the solution.
\([{ E }_{ cell }={ E }_{ cell }^{ o }-\frac { RT }{ nF } In\frac { [{ Zn }^{ 2+ }] }{ [{ Ag] }^{ 2 } } ]\)

Write a note on Freundlich adsorption isotherm.

Distinguish between (a) Ethanol and phenol (b) Phenol and acetic acid (c) Phenol and aniline (d) Phenol and anisole.

An organic compound A (C₇H₆O) forms a bisulphite. A when treated with alcoholic KCN forms B (C₁₄H₁₂O₂) and A on refluxing with sodium acetate and acetic anhydride forms an add C (C₉H_sO₂). Identify A, B and C. Explain the conversion of A to B and C.