Question # 1

Which of the following species participate in sulphonation of benzene ring?

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H₂SO₄

HSO^-₃

SO₃

SO^-₂

Calcium acetate when dry distilled gives

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Formaldehyde

Acetaldehyde

Acetone

Acetic anhydride

Which of the following has greatest reducing power?

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HI

Hbr

HCI

HI

1 mole of CH₄ contains

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6.02 x 10²³ atoms of H

4 g-atom of hydrogen

1.81 x 1023 molecules of CH₄

3.0 g of carbon

The equilibrium constant in a reversible chemical reaction at a given temperature

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Depends on the initial concentration of the reactants

Depends on the concentration of one of the products at equilibrium

Does not depend on the initial concentrations of recatants

Is not characteristic of the reaction

Natural frertilizer provides phosphorus to plants in the form of P₂O₅

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1.2 kg

2.2 kg

3.2 kg

4 kg

Which is the most amphoteric?

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Na₂O

MgO

AI₂O₃

CaO

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

Enzymes are

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Proteins

Mineral

Oils

Fatty acids

The rate at which a substance reacts depends on its

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Atomic weight

Equivalent weight

Molecular weight

Active mass

Magnesium keeps on burning in

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N₂

CO₂

N₂O

N₂ as well as CO₂

When electrons revolve in stationary orbits,

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

The substance used as a smoke screen in warfare is

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SiCl₄

PH₃

PCl₅

Acetylene

Which of the following does not reflect the periodicity of elements?

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Bonding begaviour

Electronegativity

Ionisation potential

Neutron/proton ratio

Which of the following has no tin in its composition?

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Solder

Bronze

Brass

Tin stone

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

When quantity of electricity passed is one faraday then the mass deposited at the electrode is equal to

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One gm. atomic weight

One gm. equivalent weight

Electrochemical equivalent

None of the above

Which of the following elements is most electronegative?

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Oxygen

Chlorine

Nitrogen

Fuorine

Alum is not used

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As a mordant in dyeing

As an insecticide

In purification of water

In tanning of leather

The rate of reaction between A and B increases by a factor of 100, and when the concentration with respect to A is increased 10 folds, the order of reaction w.r.t. A is

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10

1

4

2

Setting of Plaster of Paris involves

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Oxidation with atmospheric

Combination with atmospheric CO₂

Dehydration

Hydration to yield another hydrate

The symbol of the element whose atoms have the outer most electronic configuration 2s²sp³is

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N

Li

P

Na

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