Question # 1

The volume occupied by 1.4 g on N₂at S.T.P is

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2.24 dm³

22.4 dm³

1.12 dm³

112 cm³

As the quantum number n increases, the energy difference between adjacent energy level.

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Increase

Remain same

Decrease

No correlation

In a period of periodic table, atomic radii

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Increases

Decreases

Remain same

First decreases than increases

Which one of the following salts dissolved in water to form a solution with a pH lesser than 7

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NaCl

CuSO4

Na2CO3

NH4Cl

Actual yield is mostly less than the theoretical yield due to the reason that

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Rates of reactions are slow

Loss of the product during handling

Reactions are never completed 100%

Law of conservation of mass is not true

Forces of attraction between He atoms are.

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Hydrogen bonding

London forces

Debye forces

Ion dipole forces

Lyman series lie in

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Ultraviolet region

Visible region

Infrared region

Radio waves region

When water freezes at 0°C, its density decreases due to

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Cubic structure of ice

Empty spaces present in the structure of ice

Change of bond lengths

Change of bond angles

Which one of the following aqueous solutions has the highest pH

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0.1 M NaOH

0.1 M HCl

0.2 M H2SO4

0.1 M HNO3

In which of the following changes, nitrogen in reduced.

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NH3 to NO

NH3 to NO3

N2 to NH3

N-3 to N2

The concept of distribution of velocities among the gas molecules was given by.

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Clausius

Mexwell

Boltzmann

Vander waal

In lead accumulator cathode is made up of.

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Pb

Pb coated with PbO2

PbSO4

Mixture of Pb and PbO2

Rate of a chemical reaction generally increase rapidly even for small increase in temperature because of rapid increase in the

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Collisions frequency

Activation energy

Average KE of molecules

Fraction of molecules with energies more than activation energy

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

Solvent extraction method is a particularly useful technique for separation when the product to be separated is.

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

K_aand K_bof a conjugate acid and are related with k_was

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K_a+ K_b=K_w

K_a-K_b=K_w

K_a.K_b= K_w

K_a/ K_b= K_w

To achieve a good separation, the two liquids are gently shaken to increase their area of.

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Miscibility

Separation

contact

Solubility

Molarity of pure water is

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1

18

55.5

6

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