Question # 1

A sub sheel that cna accommodate 6 electrons is

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b

s

f

p

How many periods are present in the modern periodic table

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7

8

10

12

How many elements are present in 7th period.

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2

8

18

23

When system is at quilibrium state.

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The rate of the forward and reverse rections become equal

The concentrationof reatants and product becoes equal

The oposing reactions stop

The rate of the reverse reactio becomes very low

When new bonds ae formed, the energy is

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Consume

Remain same

Release

None of these

Period nuebr tells abou the

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No. of valance electrons

No. of electronic shells

Both a and b

None of the above

If the Delta H value is negative then reaction witll be

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Endotermic

Exothermic

May or may not be exothermic or endothermic

None of these

Hazardous effects of shopping bags are studied in

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Geochemistry

Inorganic chemistry

Environmental chemistry

analytical chemistry

Milk of magnesia contains Mg(OH)2 It is used as antacid It neutralizes excess stomachaacid. Which salt is formed in this reaction.

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MgCl2

MgSO4

MgCO3

MgO

Which Isotopes is commonly used to irradiate cancer cells.

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Cobalt -60

Iodine-23

Carbon -14

Iodine-131

Acidic Acid is used for

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Cleaning metal

Etching designs

Flavouring food

Making explosives

1 gram formula of NaCl contan is grams.

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100 g

58.5 g

32 g

49 g

Atomic number is represented by

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P

A

At

Z

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