Question # 1

Number of isotopes of hydrogen is

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2

5

4

3

When acids react with metals which gas is evolved?

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O2

N2

Cl2

H2

Which area of chemistry imoroves to gauge the behavior of pollutants and develp techniques for polution control?

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analytical chemistry

geochemistry

Organic chemistry

Environmental Chemsitry

Unit of atomic size is

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pm

nm

kJmol-1

Both a and b

Aong the period which one of the followig decreases.

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Electronegativity

Ionization energy

Atomic radius

Electron affinity

The solubility of which salt decreases with the increase of temperture.

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KNO3

Li2SO4

KCl

NaNO3

How many elements are present in 7th period.

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2

8

18

23

Any thing that has mass and occupies space is called.

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Liquid

Gas

Solid

Matter

The mass number of sodium is.

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19

31

27

23

1- gram atom of carbon contain hwo many moles.

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1 mole

2 mole

6 moles

12 moles

In which isotope of oxygen there are the equal numbr of protons electons and neutorns.

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O¹⁶

¹⁷O

¹⁸O

None of these

In whcih state of matter does not hae definite shape and volume.

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Liquid

Gas

Solid

All of these

How many electrons can nitrogen accept in its outermost shell.

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2

3

4

5

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