Question # 1

Whcih subshells are present in L - shell?

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S and P

Only s -sub shell

Only p - sub shell

Sub shell

When we mvoe form left to right in a period, atomic size.

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Increases

Decreases

First increases then decreased

None of the above

All chemical reaction involves.

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Enzymes

Catalyst

Energy changes

All of these

The ability of an atom to attract the shared pair of electons towards itself in a molecule is called

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Ionization energy

Electronietativity

Shielding effect

Electron affinity

Why the gas starts coming out when you open a can of fizzy drink.

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Because gteh solubiliyt of the gas increases

Because the gas is dissolved under pressure hence it comes out when pressur eis decreased

Becaue the gas is insoluble in water

Because the solubility of hte gas decreases at high pressure.

Which is the correct formula of calcium phosphide.

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CaP

Ca₃P₂

CaP₂

Ca₂P₃

All the noble gases have their valence electrons.

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Incomplete

Partialy filled

Completely filled

None of the above

A compound with chemicla formula Na₂CX₃ has formula mass 106 ami. Atomicmass of the elemetn X is.

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16

23

12

106

Whcih one of the following is the weakest force among the atoms.

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Intermolecular force

Ionic force

Metallic force

Covelent forces

Whcih of the following atoms obey duplet rule.

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O₂

Cl₂

H₂

Li₂

Bond formation energy of one O-H bond is............

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488 kJ/mol

484 kJ/mol

486 kJ/mol

489 kJ/mol

Acidic Acid is used for

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Cleaning metal

Etching designs

Flavouring food

Making explosives

Which element is capable of forming all the three types of bonds, covalent coordinate covalent or ionic.

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Carbon

Silicon

Magnesium

Oxygen

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