Question # 1

Which of the following element has the maximum electron affinity?

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F

S

I

Cl

Osmotic pressure of a solution increases by

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Decreasing the temperature

Increasing the volume

Increasing the number of molecules of the solute

None of the above

Which compound would undergo nucleophilic addition

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Ethene, C₂H₄

Bromoethane, C₂H₅Br

Ethanal, CH₃CHO

Ethane, C₂H₆

Besides Zn and Cu , German silver contains the metal

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Sn

Ag

Ni

Mg

What happens when isotonic solution of A (mol.wt.342) and B (mol.wt 60) are put in to communication through semipermeable membrane?

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Transference of solvent from solution A to that of B take place

Transference of solvent from solution B to that of A takes place

No transference of solvent from solution A to that of B takes place

Change in temperature of solutions takes place

The formula of calcium superphosphate is

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CaHPO₄

CaH₂PO₄

Ca(H₂PO₄)₂

None of these

A beaker contains 9 grams of water. The number of H atoms is

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6.02 x 10²³

3.01 x 10²³

6.02 x 10²⁴

3.01 x 10²⁴

The osmotic pressure of 1 m solution at 27°C is

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2.46 atm

24.6 atm

1.21 atm

12.1 atm

How many g of dibasic acid (mol. wt. 200) should be present in 100 ml of the aqueous solution to give 0.1 Normality?

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1 g

2 g

10 g

20 g

For which system does the equilibrium constant, KC has units of concentration

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The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

Molar mass of high molecular w.f. polymers ranges from:

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1000 to 10000

10000 to 100000

100000 to 1000000

1000 to 100000000

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High temperature and low pressure

Low temperature and high pressure

Low temperature and low pressure

High temperature and high pressure

The molecule of ethane possess which hybrization

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sp³

sp²

sp

sp²d

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

Potassium superoxide has a use in breathing equipment in space crafts. The balanced equation for the reaction is

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Angle 120° is observed in molecules :

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CH₄

CH_3-CH₃

CH -CH

CH_{2 =}CH₂

Oceans cove ______ percent of the surface of the earth

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60

70

80

97

According to Le-Chatelier's principal, adding heat to a solid and liquid in equilibrium will cause the

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Amount of solid to decrease

Amount of liquid to decrease

Temperature to rise

Temperature to fall

N₂ + O₂ ⇌2NO

The unit of K_c for tis reaction will be:

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No unit

mol^-2 dm^-3

mol^-1 dm^-3

mol^-2 dm⁺³

Cracking products are :

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Only alkanes

Only alkenes

Alkanes and alkenes

Alkynes

The specific conductance of a 0.1 N KCl solution at 23°C is 0.012 ohm^-1cm^-1. The resistance of cell containing the solution at the same temperature was found to be 55 ohm. The cell constant will be

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0.142 cm^-1

0.66 cm^-1

0.916 cm^-1

1.12 cm^-1

Alcohals can be distinguished using test:

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Lucas

Tollen's

Koib's

William's

The number of subatomic particles in atoms sidcovered is more than:

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110

100

125

90

The rate of reaction :

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Remain same as reaction proceeds.

May decrease or increase as reaction proceeds .

Increase as reaction proceeds.

Decreases as reaction proceeds.

A set of compounds in which reactivity of halogen atom in the ascending order is

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Chlorobenzene, vinyl chloride, chloroethane

Chloroethane, chlorobenzene, vinyl chloride

Vinyl chloride,chlorobenzene chloroethane

Vinyl chloride, chloroethane,chlorobenzene

The Mn³⁺has ______ color

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Violet

Green

Red/brown

No color

A solution can be

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Dilute and concentrated

Saturated and dilute

Saturated and unsaturated

Supersaturated and saturated

Natural rubber is a polymer of

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Butadiene

Ethyne

Styrene

Isoprene

The order of decreasing ease of reaction with ammonia is

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Anhydrides, esters, ethers

Anhydrides, ethers, esters

Ethers, anhydrides, esters

Esters, ethers, anhydrides

The protein which only yield amino acids and their derivatives

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Simple proteins

Complex proteins

Derived protein

All of these

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