Which of the metal is extracted by Hall-Heroult process?

(a)

Al

(b)

Ni

(c)

Cu

(d)

Zn

Which of the following is not true with respect to Ellingham diagram?

(a)

Free energy changes follow a straight line. Deviation occurs when there is a phase change.

(b)

The graph for the formation of CO₂ is a straight line almost parallel to free energy axis.

(c)

Negative slope of CO shows that it becomes more stable with increase in temperature.

(d)

Positive slope of metal oxides shows that their stabilities decrease with increase in temperature.

Concentration of copper glance is done by________.

(a)

leaching

(b)

magnetic separation

(c)

froth flotation

(d)

hydraulic washing

Steel is an alloy of___________

(a)

iron and carbon

(b)

iron and calcium

(c)

copper and carbon

(d)

copper and iron

Which of these is not a monomer for a high molecular mass silicone polymer?

(a)

Me₃SiCl

(b)

PhSiCl₃

(c)

MeSiCl₃

(d)

Me₂SiCl₂

Which of the following is not sp² hybridised?

(a)

Graphite

(b)

graphene

(c)

Fullerene

(d)

dry ice

Lewis acid character of boron trihalides is as a follows _______.

(a)

BF₃ > BCl₃ > BBr₃ > BI₃

(b)

BCI₃ > BF₃ > BBr₃ > BI₃

(c)

BI₃ > BBr₃ > BCl₃ > BF₃

(d)

BI₃ > BF₃ > BCl₃ > BBr₃

Chemical formula of phosgene is_______.

(a)

COCl₂

(b)

CaOCl₂

(c)

CaCO₃

(d)

COCI

Assertion: Bond dissociation energy of fluorine is greater than chlorine gas
Reason: Chlorine has more electronic repulsion than fluorine.
Codes:
a) Both assertion and reason are true and reason is the correct explanation of assertion.
b) Both assertion and reason are true but reason is not the correct explanation of assertion
c) Assertion is true but reason is false
d) Both assertion and reason are false

(a)

Both assertion and reason are true and reason is the correct explanation of assertion.

(b)

Both assertion and reason are true but reason is not the correct explanation of assertion

(c)

Assertion is true but reason is false

(d)

Both assertion and reason are false

Which of the following is strongest acid among all?

(a)

HI

(b)

HF

(c)

HBr

(d)

HCl

Which reaction is not feasible.

(a)

\({ 2H }_{ 2 }O+{ 2F }_{ 2 }\longrightarrow 4HF+{ O }_{ 2 }\)

(b)

\(2 \mathrm{KBr}+\mathrm{I}_{2} \longrightarrow 2 \mathrm{KI}+\mathrm{Br}_{2}\)

(c)

\(2KBr+{ Cl }_{ 2 }\longrightarrow 2KCl+{ Br }_{ 2 }\)

(d)

\(2 \mathrm{KI}+\mathrm{Br}_{2} \longrightarrow 2 \mathrm{KBr}+\mathrm{I}_{2}\)

The high reactivity of fluorine is due to________.

(a)

high ionisation energy

(b)

low bond dissociation energy

(c)

low electron affinity

(d)

high electro negativity

Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.

(a)

both Sc³⁺ and Zn²⁺ ions are colourless and form white compounds

(b)

In case of Sc, 3d orbital are partially filled but in Zn these are completely filled

(c)

last electron as assumed to be added to 4s level in case of zinc

(d)

both Sc and Zn do not exhibit variable oxidation states

The catalytic behaviour of transition metals and their compounds is ascribed mainly due to _______.

(a)

their magnetic behaviour

(b)

their unfilled d orbitals

(c)

their ability to adopt variable oxidation states

(d)

their chemical reactivity

Identify the paramagnetic species.

(a)

Cu⁺

(b)

Cr⁺

(c)

MnO₄

(d)

Zn²⁺

_________ is known as Bayer's reagent.

(a)

Hot dilute alkaline KMnO₄

(b)

Cold dilute alkaline KMnO₄

(c)

Hot Conc. acidic KMnO₄

(d)

Cold Conc. acidic KMnO₄

Which one of the following will give a pair of enantiomorphs?

(a)

[Cr(NH₃)₆][Co(CN)₆]

(b)

[Co(en)₂Cl₂]Cl

(c)

[Pt(NH₃)₄][PtCl₄]

(d)

[Co(NH₃)₄Cl₂]NO₂

Formula of tris(ethane-1, 2-diamine)iron(II)phosphate _______.

(a)

[Fe(CH₃-CH(NH₂)₂)₃](PO₄)₃

(b)

[Fe(H₂N-CH₂-CH₂-NH₂)₃](PO₄)

(c)

[Fe(H₂N-CH₂-CH₂-NH₂)₃](PO₄)₂

(d)

[Fe(H₂N-CH₂-CH₂-NH₂)₃]₃(PO₄)₂

The hypothetical complex triamminediaqua chloridocobalt (III)chloride can be represented as _______.

(a)

[Co(NH₃)₃(H₂O)₂Cl]Cl₂

(b)

[Co(NH)₃(H₂O)Cl₃]

(c)

[Co(NH₂)₃(H₂O)₂Cl]

(d)

[Co(NH₃)₃(H₂O)₃]Cl₃

In an octahedral complex, the (n-1) d orbital are involved in hybridization. The complex is called ________ complex.

(a)

inner orbital

(b)

low spin

(c)

spin paired

(d)

all the above

In a solid atom M occupies ccp lattice and \(\left( \frac { 1 }{ 3 } \right) \) of tetrahedral voids are occupied by atom N. Find the formula of solid formed by M and N ________.

(a)

MN

(b)

M₃N

(c)

MN₃

(d)

M₃N₂

The ionic radii of A⁺ and B⁻ are 0.98 x 10^-10 m and 1.81 x 10^-10 m. the coordination number of each ion in AB is ________.

(a)

8

(b)

2

(c)

6

(d)

4

In a face centred cubic cell, an atom at the face contributes to the unit cell_______.

(a)

\(\frac{1}{4}\)Part

(b)

1Part

(c)

\(\frac{1}{2}\)Part

(d)

\(\frac{1}{8}\)Part

ABAB type of packing is called _________.

(a)

hexagonal close packing

(b)

cubic close packing

(c)

tetragonal close packing

(d)

none of the above

For a reaction Rate = k[acetone]^3/2 then unit of rate constant and rate of reaction respectively is _______.

(a)

(mol L^-1 S^-1),(mol^1/2 L^1/2 S^-1)

(b)

(mol^-1/2 L^1/2 s^-1),(mol L^-1 s^-1)

(c)

(mol^1/2 L^1/2 s^-1),(mol L^-1 s^-1)

(d)

(mol L s^-1),(mol^1/2 L^1/2 s)

In a reversible reaction, the enthalpy change and the activation energy in the forward direction are respectively −x kJ mol^-1 and y kJ mol^-1. Therefore, the energy of activation in the backward direction is _______.

(a)

(y-x) kJ mol^-1

(b)

(x+y) J mol^-1

(c)

(x-y) KJ mol^-1

(d)

(x+y) x 10³J mol^-1

For a reaction: aA ⟶ bB, the rate of reaction is doubled when the concentration of A is increased by four times. The rate of reaction is equal to _____.

(a)

k[A]^a

(b)

\(k{ \left[ A \right] }^{ \frac { 1 }{ 2 } }\)

(c)

\(k{ \left[ A \right] }^{ \frac { 1 }{ a } }\)

(d)

K[A]

The half-life period of a first order reaction is 69.3 seconds. Its rate constant is ________.

(a)

10^-2 s^-1

(b)

10^-4 s^-1

(c)

10 s^-1

(d)

10² s^-1

What is the decreasing order of strength of bases
OH, NH₂^- H - C ≡ C and CH₃ - CH₂^-

(a)

OH^->NH₂^- >H-C≡C >CH₃^-CH₂^-

(b)

NH₂^->OH^->CH₃^-CH₂^- >H-C≡C

(c)

CH₃^-CH₂^->NH₂^->H-C≡C^->OH^-

(d)

OH^->H-C ≡ C^->CH₃^-CH₂^- >NH₂^-

Dissociation constant of NH₄OH is 1.8 x 10^-5  the hydrolysis constant of NH₄Cl would be _______.

(a)

1.8 × 10^-19

(b)

5.55 × 10^-10

(c)

5.55 × 10^-5

(d)

1.80 × 10^-5

Which among the following has the highest pH?

(a)

1M NH₄ OH

(b)

1M HCI

(c)

1M NaOH

(d)

0.1 M NaOH

Henderson equation for a weak acid and its salt is _______.

(a)

pH = pK_b+ log (Salt) / (Acid)

(b)

pH = pK_a + log (Salt) / (Acid)

(c)

pH = pK_a + log (Salt) / (Base)

(d)

pH = pK_a + log (Acid) / (Salt)

How many faradays of electricity are required for the following reaction to occur MnO₄^-→ Mn²⁺

(a)

5F

(b)

3F

(c)

1F

(d)

7F

While charging lead storage battery _______.

(a)

PbSO₄ on cathode is reduced to Pb

(b)

PbSO₄ on anode is oxidised to PbO₂

(c)

PbSO₄ on anode is reduced to Pb

(d)

PbSO₄ on cathode is oxidised to Pb

What happens during the electrolysis of molten sodium chloride?

(a)

Cl₂ is released at the cathode

(b)

Liquid sodium is obtained at the anode

(c)

The emf of the overall reaction is -4.07 V

(d)

Cl₂ is released at the cathode and Liquid sodium is obtained at the anode

The metals near the bottom of the electro chemical series are ______.

(a)

strong reducing agents

(b)

strong oxidising agents

(c)

weak reducing agents

(d)

weak oxidising agents

Which one of the following characteristics are associated with adsorption?

(a)

\(\Delta\)G and \(\Delta\)H are negative but \(\Delta\)S is positive

(b)

\(\Delta\)G and \(\Delta\)S are negative but \(\Delta\)H is positive

(c)

\(\Delta\)G is negative but \(\Delta\)H and \(\Delta\)S are positive

(d)

\(\Delta\)G, \(\Delta\)H and \(\Delta\)S all are negative.

Which one of the following is correctly matched?

(a)

Emulsion - Smoke

(b)

Gel - butter

(c)

foam - Mist

(d)

whipped cream - sol

Which among the following does not affect adsorption?

(a)

surface area of the adsorbent

(b)

catalyst

(c)

temperature

(d)

pressure

An emulsion is a colloidal solution of _______.

(a)

two solids

(b)

two liquids

(c)

two gases

(d)

one solid and one liquid

Which of the following compound can be used as antifreeze in automobile rediators?

(a)

methanol

(b)

ethanol

(c)

Neopentyl alcohol

(d)

ethan -1, 2-diol

One mole of an organic compound (A) with the formula C₃H₈O reacts completely with two moles of HI to form X and Y. When Y is boiled with aqueous alkali it forms Z. Z answers the iodoform test. The compound (A) is  ______.

(a)

propan – 2-ol

(b)

propan -1-ol

(c)

ethoxy ethane

(d)

methoxy ehane

Ethers in the presence of atmospheric oxygen oxidises to give hydroperoxides and dialkyl peroxides Such a spontaneous reaction by atmospheric oxygen is called ______.

(a)

auto oxidation

(b)

acylation

(c)

alkylation

(d)

dehydration

The characteristic odour of lower phenol is _________.

(a)

carbolic acid

(b)

fruity

(c)

oil of bitter almond

(d)

rotten fish

Phenyl methanal is reacted with concentrated NaOH to give two products X and Y. X reacts with metallic sodium to liberate hydrogen X and Y are ________.

(a)

sodium benzoate and phenol

(b)

Sodium benzoate and phenyl methanol

(c)

phenyl methanol and sodium benzoate

(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)

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

The number of carbon atoms in a chain can be increased with _______ reaction.

(a)

Grignard

(b)

Cannizaro reaction

(c)

HVZ

(d)

Clemmensen

acid chloride + alcohol \(\longrightarrow\)?.

(a)

acids

(b)

amides

(c)

esters

(d)

amines

Which one of the following nitro compounds does not react with nitrous acid.

(a)

CH₃ -CH₂ -CH₂ -NO₂

(b)

(CH₃)₂ CH - CH₂NO₂

(c)

(CH₃)₃ C NO₂

(d)

\({ CH }_{ 3 }-\underset { \overset { || }{ O } }{ C } -\underset { \overset { || }{ { CH }_{ 3 } } }{ CH } -{ NO }_{ 2 }\)

The order of basic strength for methyl substituted amines in aqueous solution is _________.

(a)

N(CH₃)₃> N(CH₃)₂H> N(CH₃)H₂> NH₃

(b)

N(CH₃)H₂>N(CH₃)₂H > N(CH₃)₃>NH₃

(c)

NH₃> N(CH₃)H₂> N(CH₃)₂ H>N(CH₃)₃

(d)

N(CH₃)₂H>N(CH₃)H₂> N(CH₃)₃> NH₃

Electrolytic reduction of nitrobenzene in strongly acidic medium gives

(a)

aniline

(b)

p - aminophenol

(c)

m-nitroaniline

(d)

azoxybenzene

The tertiary nitro compound is ___________

(a)

2-nitropropane

(b)

1-nitropropane

(c)

1-nitro-2, 2-dimethyl propane

(d)

2-nitro-2-methyl propane

Which of the following vitamins is water soluble?

(a)

Vitamin E

(b)

Vitamin K

(c)

Vitamin A

(d)

Vitamin B

Which of the following amino acids are achiral?

(a)

Alanine

(b)

Leucine

(c)

Proline

(d)

Glycine

Which is not a saturated fatty acid?

(a)

Palmitic acid

(b)

Stearic acid

(c)

Oleic acid

(d)

Glyceric acid

Disaccharides linked through the glycosidic carbon atoms of C₁ of glucose and C₂ of fructose are_______

(a)

non-reducing

(b)

reducing

(c)

both (a) and (b)

(d)

neither (a) nor (b)

Dettol is the mixture of _____________.

(a)

Chloroxylenol and bithionol

(b)

Chloroxylenol and \(\alpha\)-terpineol

(c)

phenol and iodine

(d)

terpineol and bithionol

Antiseptics and disinfectants either kill or prevent growth of microorganisms. Identify which of the following statement is not true.

(a)

dilute solutions of boric acid and hydrogen peroxide are strong antiseptics.

(b)

Disinfectants harm the living tissues

(c)

A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant

(d)

Chlorine and iodine are used as strong disinfectants

The free radical polymerisation of the monomer 2 - chloro buta - l,3-diene gives _______________.

(a)

Buna N

(b)

Buna S

(c)

Neoprene

(d)

PHB

The quality of a soap is described in term of _______

(a)

LDPE

(b)

HDPE

(c)

TFM (Total fatty matter)

(d)

LFM (Lowfatty matter)