Question # 1

Which one of the following substances is used as water absorber in combustion analysis.

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Mg(CIO4)2

50% KOH

Lime water

Dilute solution of NaOH

The diffusion of gases at absolute zero will be

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Unchanged

Zero

slightly decreases

Slightly increases

If absolute temperature of gas is doubled and the pressure is reduced to one half, the volume of the gas will.

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Remain unchanged

Increase four times

Reduce to 1/4

Be doubled

The lightest value of lattice energy is for which one of these ionic compounds.

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NaI

NaF

NaBr

NaCl

De Broglie equation treats electron to be.

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A particle

Wave

Both particle and wave

None of these

Which compound does not obey the octet rule.

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NH3

BCl3

H2O

CH4

Which one of the following correctly describe the shape of NH3 molecules.

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tetrahedral

Pyramidal

Angular

Square planar

The reduction potential of Zn is.

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+0.76 V

-0.34 B

+0.34 V

-0.76 V

The deviation of a gas from ideal behavior is maximum at.

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-10 ^oC and 5.0 atm

-10^oC and 2 atm

0^oC and 2 atm

100^oC and 2 atm

At equilibrium stage of chemical reaction

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The concentration of reaction is equal to concentration of products

The rate constant of forward reaction is equal to rate constant of backward reaction

The rate of forward reaction is equal rate of backward reaction

The energy of activation of forward step is equal to energy of activation of backward step

When 5d orbital is completed them entering electron goes into.

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6s

6p

6d

6f

That cell in which electrical energy is converted into chemical energy is called

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Galvanic cell

Electrolytic cell

Fuel cell

Daniel cell

the number of Al³⁺ ion sin AlCl₃is 2.007 x 10²³. The number of Cl- ions are.

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6.02 x 10²³

3.01 x 10²³

1.5 x 10²³

Diamond is a bad conductor because.

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It has tight structure.

It has a high density

There is no free electron present in the crystal of diamond to conduct electricity

None of the above

Rate of a chemical reaction generally increase rapidly even for small increase in temperature because of rapid increase in the

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Collisions frequency

Activation energy

Average KE of molecules

Fraction of molecules with energies more than activation energy

Colligative properties are the properties of.

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Dilute solution which behave as nearly ideal solutions

Concentrated solutions which behave as nearly non ideal solutions

Both a and b

Neither a nor b

CO+ is an example of.

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Free radical

Cationic molecular ion

Anionic molecular ion

Stable molecule

NaCI and sand can be separated by one of the following without filtration

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Formation of solution and filtration

Formation of solution and evaporation without filtration

Sublimation

Chromatiograghy

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