Question # 1

Heating a mixture of sodium benzoate and soda lime gives

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Methane

Benzene

Sodium benzene

Calcium benzoate

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

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

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Decreases

Increases

Remains constant

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

Most common reactions of benzene and its derivatives are

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Electrophilic addition reactions

Electrophilic substitution reactions.

Nucleophilic addition reactions

Nucleophilic substitution reactions

The rate of a reaction can be increased in general by all the factors except by

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Using a catalyst

Increasing temperature

Increasing the activation energy

Increasing the conc. of reactants

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

An electrolyte

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Forms complex ions in solution

Gives ions only when electricity is passed

Possesses ions even in solid state

Gives ions only when dissolved in water

Which of the following statement is correct if the intermolecular forces in liquids A, B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

In a reversible chemical reaction having two reactants in equilibrium if the concentration of the reactants are doubled then the equilibrium constant will

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Also be doubled

Be halved

Becomes one fourth

Remains the same

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

Natural fertilizer from plants and animals provide nitrogen

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1.5 kg

3.0 kg

4.5 kg

6 kg

Calcium acetate when dry distilled

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

A cell constant is generally found by measuring the conductivity of aqueous solution of

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BaCl₂

KCl

NaCl

MgCl₂

The ratio of close packed atoms to tetrahedral holes in cubic close packing is

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1 : 1

1 : 2

1 : 3

2 : 1

Which of the following fluorides does not exist?

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NF₅

PF₅

AsF₅

SbF₅

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

Hess's law deals with

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Changes in heat or reaction

Rate of reaction

Equilibrium constant

Influence of pressure on volume of a gas.

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

Which of the following has least mass?

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2 gram atom of nitrogen

3 x 10²³atoms of C

1 mole of S

7.0 g of Ag.

The number of atoms contained in 11.2 L of SO₂at S.T.P are

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3/2 x 6.02 x 10²³

2 x 6.02 x 10²³

6.02 x 10²³

4 x 6.02 x 10²³

The IUPAC name of the compound having the formula (CH₃)₃C - CH = CH₂is

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1, 1-Dimethyl-3-butene

1, 1, 1-Trimethyl-3-propene

3, 3,-Dimethyl-1-butene

3, 3, 3,-Trimethyl-1-propene

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