Question # 1

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

The e/m value for the positive rays in maximum for the gas.

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Helium

Oxygen

Nitrogen

Hydrogen

The bond order of N2 molecule is.

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1

2

3

4

Solvent extraction method is a particularly useful technique for separation when the product to be separated is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

The gain of electron is known as.

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Oxidation

Reduction

Dehydration

Dehydrogenation

Maximum number of electrons in f-subshell is.

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2

6

10

14

If fluted fitter paper, rate of filtration increases as compared tot he cone shaped filter paper because.

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It has greater number of holes in it.

It has greater surface are of filtration

Fluted filter paper has greater pore sizes than cone shaped filter paper.

Thickness of paper is more than cone shaped filter paper

Existence of an element in more than one crystalline form is known as.

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Anisotropy

Allotropy

Isomorphism

Unit cell

What happens to the enthalpy change when the coeffficients of a chemical equation are douubled

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It doubles

It becomes half

It does not change

It cannot be predicted

Noon has low critical temperature and pressure as compared to other gases. the most probable reason is that

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Its octet is complete

It is a monoatomic gas

It has very low polarizability

It has least forces of attraction

The mass fo 1.505 x 10²³atoms of sulphur is.

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0.5 g

0.6 g

0.7 g

0.8 g

Down the VII -A group, polarizability generally.

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Increases

Decreases

Remain constant

Negligible

The sum of all kinds of energies of atoms, ions or molecules of a system is known as.

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Kinetic energy

Potential energy

Internal energy

Solar energy

At which distance a molecule is present from its neighbor molecules of its own diameter, at room temperature.

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100 times

200 times

300 times

400 times

Heat of solution of an ionic compound is equal to.

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Hydration energy

Lattice energy

Slum of both 'a' and 'b'

Difference of both a and b

Solubility of which substance decreases by increasing temperature.

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NaNO3

KNO2

NaCl

Ce2(SO4)3

For a given process, the heat change at constant pressure (q_p) and at constant volume (q_v) are related to each other as

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q_p= q_v

q_p< q_v

q_p> q_v

q_p= q_v/2

Cadmium has isotopes.

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3

4

5

9

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