Question # 1

In a period of periodic table, atomic radii

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Increases

Decreases

Remain same

First decreases than increases

Half life period for 235 U is

92

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710 million years

810 milion years

720 million years

820 million years

The volume occupied by 1.4 g of N2 at S.T.P is

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2.24 dm3

22.4 dm3

1.12 dm3

112 cm3

Which solution is an example of solid in gas

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Fog

Steel

smoke

Air

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

For a gas obeying Boyle's law if pressure is doubled, the volume becomes.

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Double

One half

Four times

Remains constant

Transition from various energy levels to the lowest energy level gives.

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Lyman series

Balmer series

Panchen sereis

Pfund series

Which one of the following process is endothermic

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condensation of steam

Freezing of water

electrolysis of water

None of these

The unit of the rate constant is the same as that of the rate of reaction in

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

The optimum temperature for the synthesis of NH3 by Haber's process is.

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200 ^oC

300 ^oC

400 ^oC

500 ^oC

In NICAD dry cell, the cathode and anode is made up of.

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Ca and Ag

Ni and CdO2

NiO2 and Cd

Ag and Ag2O

The oxidation of O -atom in OF3 is.

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-2

+2

-1

+1

The value of pH and P^oHof pure water at 25° C is

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14

7

1 x 10^-14

1 x 10¹⁴

The molal boiling point constant is the ration of the elevation in boiling point to

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Molarity

Molality

Mole fraction of solvent

Mole fraction of solute

The carbon atom is C2H4 is.

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sp3 hybridized

sG2 hybridized

Sp hybridized

dsG2 bybridized

Solubility of which substance decreases by increasing temperature.

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NaNO3

KNO2

NaCl

Ce2(SO4)3

A filtration process could by very time consuming if it were into aided by a gentle suction which is developed.

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If the paper covers the funnel upto its circumference

If the paper has got small sized pores in it.

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

Quantum number values for 2p orbitals are

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n = 2, l = 1

n =1, 1 = 2

n =1, l = 0

n = 2, l = 0

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