In the froth-floatation process the collectors such as pine oil and xanthates, etc enhance.

(a)

Non-wettability of the mineral particles in froth.

(b)

Non-wettability of the mineral particles in water

(c)

Non-wettability of the gangue particles in froth

(d)

Non-wettability of the gangue particles in water

Malachite has______ composition.

(a)

2CuCO₃.Cu(OH)₂

(b)

CuCO₃.Cu(OH)₂

(c)

Cu₂O

(d)

Cu₂S

Magnesite is_______.

(a)

Magnesium oxide

(b)

Magnesium carbonate

(c)

Magnesium sulphate

(d)

Magnesium chloride

In the thermite process __________is used as a reducing agent

(a)

AI

(b)

CO

(c)

C

(d)

CO₂

Graphite has _______.

(a)

2-d sheet structure

(b)

Vander waals force between successive layers of carbon sheets

(c)

Sp² hybridised carbon linked with other three carbon atoms in hexagonal planar structure

(d)

all the above

Elements of group 13 mainly form covalent compounds because ______

(a)

small size

(b)

electro negativity values are high

(c)

ionization energy is very high

(d)

both (a) and (c)

Which of the following halides of group 15 is not hydrolysed?

(a)

NF₃

(b)

PF₃

(c)

NI₃

(d)

Both (a) and (b)

Least volatile hydrogen halide is ______.

(a)

HF

(b)

HCI

(c)

HBr

(d)

HI

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

Most of the transition metal ions are coloured, because of the ________.

(a)

presence of unpaired electrons

(b)

energy gap between two energy levels is very small

(c)

both (a) and (b)

(d)

neither (a) nor (b)

Ce (Z=58) and Yb (Z=70) exhibits stable +4 and +2 oxidation states respectively. This is because_______.

(a)

Ce⁴⁺ and Yb²⁺acquire f⁷ configuration

(b)

Ce⁴⁺ and Yb²⁺ acquire f⁰ configuration

(c)

Ce⁴⁺ and Yb²⁺acquire f⁷ and f¹⁴ configuration

(d)

Ce⁴⁺and Yb²⁺ acquire f⁰ and f¹⁴ configuration

Identify the correct reason for lanthanide contraction.

(a)

Decreasing nuclear charge

(b)

Decreasing screening effect

(c)

Increasing nuclear charge

(d)

Negligible screening effect

________ has the highest electrical conductivity at room temperature.

(a)

Chromium

(b)

Copper

(c)

Silver

(d)

Cadmium

Primary and secondary valencies of Cu in [Cu(NH₃)₄]SO₄ is _______.

(a)

4,4

(b)

2,4

(c)

4,1

(d)

4,2

Among the following complexes the one which shows zero crystal field stabilisation energy is _______.

(a)

[Mn(H₂O)₆]³⁺

(b)

[Fe(H₂O)₆]³⁺

(c)

[CO(H₂O)₆]²⁺

(d)

[CO(H₂O)₆]³⁺

The name of [Pt^IV(NH₃)₂CI₂]²⁺is _______.

(a)

Diamminedichloroplatinum(IV) ion

(b)

Diamminedichloroplatinate (IV)

(c)

Diamminedichloroplatinum

(d)

Dichlorodiammineplatinum (IV) ion

The isomerism exhibited by the complexes [Co(NH₃)₆] [Cr(CN)₆] and [Cr(NH₃)₈] [CO(CN)₆] is_______.

(a)

Geometrical

(b)

Coordination

(c)

linkage

(d)

ionisation

A Cobaltous complex [Co(H₂O)₆]³⁺absorbs orange light of 5900 \(\mathring { A } \). The colour of the complex is _______.

(a)

orange

(b)

yellow orange

(c)

blue

(d)

yellow

In which of the following arrangements, octahedral voids are formed?

(a)

fcc

(b)

bcc

(c)

simple cubic

(d)

hcp

Which of the following statement is correct?

(a)

On increasing temperature, the coordination number of solid remains unchanged.

(b)

On increasing pressure, the co-ordination number of solid increases.

(c)

On increasing pressure, the co-ordination number of solid decreases.

(d)

On increasing temperature, the coordination number of solid increases

Pick out the example for covalent and molecular crystal.

(a)

Ice, Diamond

(b)

Diamond, Ice

(c)

NaCl, FeS

(d)

FeS, Ice

The number of chloride ions present per unit of CsCI are _______.

(a)

6

(b)

8

(c)

1

(d)

4

In pseudo-order reactions ______.

(a)

The actual order of reaction is different from that expected using rate law expression

(b)

The concentration of at least one reactant is taken in large excess.

(c)

The concentration of reactant taken in excess may be taken as constant

(d)

All of these

In the graph showing Maxwell, Boltzmann distribution of energy _____.

(a)

area under the curve must not change with increase in temperature.

(b)

area under the curve increases in temperature.

(c)

area under the curve decreases with increase in temperature.

(d)

None of these above

A device in which spontaneous chemical reaction generates electric current ________.

(a)

Galvanic cell

(b)

Voltaic cell

(c)

Daniel cell

(d)

All the above

The zinc - copper cell has emf of _______.

(a)

1V

(b)

2.1 V

(c)

1.1V

(d)

-1.1 V

Auto catalysis is observed in the reaction given below.
CH₃COOC₂H₅+H₂O➝ CH₃COOH+C₂H₅OH

(a)

CH₃COOC₂H₅

(b)

H₂O

(c)

CH₃COOH

(d)

C₂H₅OH

Emulsion can be broken into constituent liquids by _______.

(a)

heating

(b)

freezing

(c)

centrifuging

(d)

all the above

The property of the colloid which is independent on the charge of colloidal particle is______.

(a)

cataphoresis

(b)

electrophoresis

(c)

electro- osmosis

(d)

Tyndall effect

Which among the following reagent is not used to differentiate ethanol and phenol?

(a)

neutral FeCl₃

(b)

C₆H₅N₂CI

(c)

NaOH

(d)

anhy ZnCl₂

The compound that reacts faster with Lucas reagent is ________.

(a)

butan-l-ol

(b)

butan-2-ol

(c)

2-methyl propan-1-ol

(d)

2-methyl propan-2-ol

1 - methoxy propane and 2 - methoxy propane are ________.

(a)

chain isomers

(b)

position isomers

(c)

metamers

(d)

functional isomers

Which among the carbonyl compounds cannot be prepared by Rosenmund reduction?

(a)

Ketones

(b)

Formaldehyde

(c)

Acetaldehyde

(d)

Both (a) and (b)

Calcium acetate + calcium benzoate \(\overset { distillation }{ \longrightarrow } \) gives _______.

(a)

benzophenone

(b)

benzaldehyde

(c)

acetophenone

(d)

phenyl benzoate

The pink colour of Schiff's reagent is restored by _______.

(a)

alcohol

(b)

acid

(c)

ketone

(d)

aldehyde

Ozonolysis of terminal alkenes gives _________ as one of the products.

(a)

acetone

(b)

acetaldehyde

(c)

water

(d)

formaldehyde

Aldehydes and ketones are reduced to hydrocarbons by zinc amalgam and cone.HCI. This is__________ reaction.

(a)

Clemmenson's reduction

(b)

Wolff krishner reduction

(c)

Rosenmmunds reduction

(d)

catalytic reduction

Which among the following reactions will give a secondary amine?

(a)

\(\mathrm{CH}_{3} \mathrm{CONH}_{2} \stackrel{\mathrm{Br}_{2} / \mathrm{KOH}}{\longrightarrow}\)

(b)

\(\mathrm{CH}_{3} \mathrm{CONH}_{2} \stackrel{\mathrm{LiAlH}_{4}}{\longrightarrow}\)

(c)

\({ CH }_{ 3 }CN\xrightarrow [ Na/{ C }_{ 2 }{ H }_{ 5 }OH ]{ } \)

(d)

\(\mathrm{CH}_{3} \mathrm{NC} \stackrel{\mathrm{LiAlH}_{4}}{\longrightarrow}\)

The IUPAC name of the compound
\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ CH } -{ CH }_{ 2 }-{ NO }_{ 2 }\)

(a)

1-nitro propane

(b)

1-nitro 2-methyl propane

(c)

1-nito-2, 2-dimethyl propane

(d)

2-nitro-2-methyl propane

Nitro-acinitro tautomerism is exhibited by ____________

(a)

nitromethane

(b)

nitrobenzene

(c)

chloropicrin

(d)

o-toluidine

A dipeptide does not have

(a)

two peptide units

(b)

portions of two amino acids

(c)

an amino group

(d)

salt like structure

Carbohydrates are

(a)

polyhydroxy aldehydes

(b)

polyhydroxy ketones

(c)

polyhydroxy acids

(d)

both (a) and (b)

When cellulose is boiled with dilute H₂SO₄ it gives

(a)

D-glucose

(b)

D-fructose

(c)

Dextrine

(d)

Starch

Pyridoxine is__________

(a)

vitamin B₆

(b)

vitamin B₇

(c)

vitamin B₉

(d)

vitamin B₅

Oxidation of gluconic acid with nitric acid gives__________

(a)

saccharicacid

(b)

CO₂ and water

(c)

acetic acid

(d)

maltose

The helical structure of protein is stabilised by_________

(a)

peptide bonds

(b)

disulphide bonds

(c)

hydrogen bonds

(d)

Vanderwaals inter action

Which among the following is a modification of penicillin?

(a)

amoxicillin

(b)

catecholamine

(c)

Crythromycin

(d)

all the above

Pick out the wrong statement among the following.

(a)

Antipyretics is used to reduce the body temperature

(b)

Analgesics are drugs used to relieve pain

(c)

Milk of magnesia is used to relieve symptoms of heat burn

(d)

Tetracyclines are antifertility drugs

Cellulose is an example of _____ polymer.

(a)

synthetic

(b)

Natural

(c)

semisynthetic

(d)

none of the above

Sorbitol and Mannitol are ________

(a)

isomers

(b)

polymers

(c)

epimers

(d)

dimers