Question # 1

How many molecules of CO2 are formed by burning 12 g carbon with excess of oxygen.

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3.01 x 10²³

1 x 10²³

6.02 x 10²³

1.03x 10²³

A buffer solution can be prepared by mixing

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Weak acid and its salt with weak base

Weak base and its salt with strong acid

Strong acid and its salts with weak base

Strong base and its salt with weak acid

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1The wave length of this light is.

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500 nm

500 m

200 nm

600 m

The shielding effect of the inner electrons is responsible for

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Increasing ionization energy values

Decreasing ionization energy values

Increasing electron affinity

Increasing electonegativity

Which electron traveled more distance, when jump from

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n1 to n2

n2 ato n3

n3 to n2

n3 to n4

The ration of number of molecules of 2 g H2 g to number of molecules of 64 g gaseous oxygen is.

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1:1

1:2

1:32

1:4

Ionic bond is formed by combination of groups

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IA and VIII

II A and VII A

IV A and VA

VIA and VII A

a zero order reaction is one is which

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Reactants do not react

One reactant is in large excess

Concentration of reactant do not change with passage of time

Rate is of affected by changing concentration of reactants

In order to mention the B.P of water at 110 ^oC the external pressure should be.

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

765 torr

Any value of pressure

In endothermic reactions, the heat content of the

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Products is more then that of reactants

Reactants is more than that of products

Both a and b

Reactant and products is equal

the nature of the positive rays depend on

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The nature of the electrrode

The nature of the discharge tube

The nature of the residual gas

All of the above

The optimum temperature for the synthesis of NH3 by Haber's process is.

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200 ^oC

300 ^oC

400 ^oC

500 ^oC

pH of rain water.

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7

Slightly basic

slightly acidic

Highly basic

Standard enthalpy of combustion of carbon is -394 kJ mol-1 than, which is the standard enthalpy of formation of CO2

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+394 kJ

-394 kJ

0 kJ

+197 kJ

The shape of Sncl2 molecule is.

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Linear

Angular

Trigonal planar

Tetrahedral

Gas molecules show more deviation from ideal behaviour at high pressure because.

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Velocity of molecules increases

Velocity of molecules decreases

Force of attraction between molecules increases

Force of collision per unit area increases

Which of the following has highest percentage ionic character.

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HCl

HF

HBr

HI

If uncertainty position of an electron is zero, the uncertainty in its momentum would be

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Zero

Infinite

Both a and b

None of these

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