Question # 1

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remain constant

Decreses for low value of Z and increases for higher value of Z.

One mole of gas refers to

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The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 litres of a gas at S.T.P.

Maximum number of active hydrogens

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Acetic acid

Glycerol

Methane

Methanol

The total number of protons in 10 g of calcium carbonate is (N₀= 6.023 x 10²³)

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1.5057 x 10²⁴

2.0478 x 10²⁴

3.0115 x 10²⁴

4.0956 x 10²⁴

According to MO theory, the species O⁺₂

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Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

The percentage of oxygen in NaOH is

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40

60

8

10

Al is more reactive than Fe but Al is less easily corroded than Fe because

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It is a noble metal

oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

Minamata disease is due to pollution of

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Organic waste

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Natural fertilizer provides phosphorus to plants in the form of P₂O₅

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1.2 kg

2.2 kg

3.2 kg

4 kg

The vapour density of a gas is 11.2. The volume occupied by 11.2 g of this gas at N.T.P. is

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22.4 litres

11.2 litres

1 litre

2.24 litres

Bromine is obtained on a commercial scale from

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Caliche

Carnallite

Common satl

Cryolite

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

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The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding

The most reactive compound for electrophilic nitration will be

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Benzyl chloride

Benzoic acid

Nitrobenzene

Chlorobenzene

The mass of the neutron is of the order of

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10^-23kg

10^-24kg

10^-26kg

10^-27kg

Which one is the property of an ideal solvent?

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Should be expensive

It should react chemically with the solute

Impurities should crystallize along with the solute

Should be safe to use

Reaction of acids with alcohols is also known as

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Esterification

Saponification

Alkalization

None

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