Question # 1

Atmosphere of big/metropolitan cities is polluted most by

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Automobile exhausts

Pesticide residue

Household waste

Radio-active fall out

Vitamin A is present in

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Liver

Milk

Green vegetables

All

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

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N

Li

P

Na

Which of the following as a molecular diseaes?

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Allergy

Cancer

German measles

Sickle cell anemia

Crystal can be classified in to -------------- basic crystal habits

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7

3

14

3

Which one of the following has the lowest boiling point?

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B

Al

Ga

Ti

The percentage of oxygen in NaOH is

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40

60

8

10

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

Which of the following is a colligative property?

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Melting point

Osmotic pressure

Freezing point

Sublimation temperature

Acid rains are produced by

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Excess NO₂ and SO₂from burning fossil fuels

Excess production of NH₃ by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂ by combustion and animal respiration

Which of the following statements is correct with respect to the property of elements with increase in atomic number in the carbon family (group 14)?

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Their metallic character decreases

The stability of +2 oxidation state increases

Their ionization energy increases

Their atomic size decreases

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

Cl2 > Br2 > F2

Cl2 C12 > Br2

F2 > Br2 > C12

The kinetic theory of gases predicts that total kinetic energy of a gaseous assemble depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure, temperature, and volume of the gas.

The halide which is not hydrolysed is

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SiCl₄

SiF₄

CCl₄

PbCl₄

Natural fertilizer provides potassium in the form of K₂O (potash)

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1.5 kg

3 kg

4.5 kg

6.5 kg

In Friedal-Craft's alkylation besides AlCl₃the other reactants are

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C6H6 + NH3

C6H6 + CH4

C6H6 + CH3Cl

C6H6 + CH3COCl

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde.

The percentage of nitrogen in urea is

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46

60

70

80

Number of elements present in the fifth period of periodic table is

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8

10

18

32

Which one of the halogen acid is a liquid?

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HF

HCl

HBr

Hl

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

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