Question # 1

Alumina is not used as

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Refractory material

A medium in chromatography

An abrasive

A White pigment

The molar mass of an organic acids is determined by

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Depression of freezing point

Elevation of boiling point

Volumetric method

Victor Myer's method

Arrange the hydrides group 15 in the order of increasing boiling point.

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PH3 < AsH3 <SbH3 < BiH3 <NH3

PH3 <AsH3< SbH3< NH3 < BiH3

PH3 < AsH3<NH3 <SbH3<BiH3

NH3 < PH3 < AsH3 < Sb H3 < BiH3

What element constitutes the major component of most bronzes.

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Tin

Zinc

Carbon

Aluminum

When CH3COOH is titrated against NaOH the pH as the equivalence point is.

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7

> 7

o

>7

6.8

In whihc period, the element with least ionization enthalpy belong to

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Group I

Group 2

Group 17

Group 18

Which of the following radical is not a member of IV group.

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Mg²⁺

Co²⁺

Ni²⁺

Mn²⁺

Wlhich of the following can act as a protective colloid

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Gelatin

Silica gel

Oil in water emulsion

All three

Which of the following is an azo dye.

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Congo red

Rhodamine B

Ertythroein

Paraosaniline

Which of the following state is not correct regarding Langmunir adsorption theory.

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Adsorbent has specific equivalent sites

One site can adsorbs only one molecule

Adsorbed molecules cannot interact with each other

Adsorption is a static process

The entropy of the universe

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Tends towards a maximum

Tend towards a maximum

Tends to be zero

Remains constatn

Which of the following source of energy is abundant everlasting and non polluting.

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Nuclear

Electric

Solar

All above

The sum of pH and pOH is aqueous solution is equal to.

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14

7

zero

pKw

The pKa of acetic acid is 4.74 which implies that.

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pH of 1N solution is 4.74

At pH 4.74 the dissociation of acetic acid is maximum

At pH 4.74 half of the acetic acid molecules are dissociated in the solution.

At pH 4.74 the dissociation of acetic acid is minimum.

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

Which of the following type of lattice has maximum numb of atoms per unit cell.

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Simple cubic

Body centred cubic

Face centred cubic

All of them

Which of the following is not an ore of Cr.

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Chrome iron

Nicollite

Crocisite

Chrome ochre

Toluene is o/p -orienting with respect to an electrophilic substitution reaction due to.

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+1 effect of the methyl group.

+1 as wellas +H effect of the methyl group

Hyper conjugatin between the methyl group and phenyl ring.

+ R effect of the methyl group

Which of the following is not an alkali metal.

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Potassium

Francium

Sodium

Strontium

Which of the following statements are correct for Linear polymers.

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Linear polymers may be condensation as well as addition polymers

Structure is well packed in nature

Linear polymers have higher density higher melting point and higher tensile strength

All are correct

Which of the following is always true for the adiabatic expansion of gas.

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Temperature rises

Pressure rises

W=0

Q = 0

The enrichment of chemical substance at the surface of a solid is called

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Adsorption

Absorption

Sorption

Isotherm

Opticla tweezers

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Are used to remove facial hair with miniaturized laser beams

use light to manipulate particles as small as single atom

Are a nanotechnology bases tool for stamp collectors

Don't exist

Which of the following statement is not correct with reference to cell constant.

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The dimensions of cell constant is cm-1

It is used to determine the specific conductance

It is measured with KCl solution

Specific conductance does not vary with concentration.

The dimensions for first order rate constant are.

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s-1

s mol-1

mol-1 s-1

s

According to SHAH concept the Lewis bases were classified on the basis os.

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Charge ion size

Polarization consideration

Electron and co coordinating ability

All of above

Which of the following reaction cannot be used for the synthesis of a amino acids.

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Gabriel phthalimide

Streckers synthesis

Sorensen synthesis

Schmidt synthesis

The pH of the 1.3 x 10^-4 NH₄Cl is

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1.3

4.0

2.886

3.886

During the last two centuries, the atmospheric CO2 contents are increased by

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15%

25%

35%

50%

Which is the purest form of iron.

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Pig iron

Cast iron

Wrought iron

Steel

CNG is stored under

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Power genertion

Electric Generators

Solvent

All of above

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