Question # 1

Which of the following is true for ionic compounds

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They are non-electrolytes in the molten state

They have bonds which are directional

They conduct electricity in solid state

They are generally more soluble in polar solvents than in non-polar solvents

At constant temperature in a given mass of and ideal gas.

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The ratio of pressure and volume remains constant

Volume always remains constant

Pressure always remains constant

The product of pressure and volume remains constant

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

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Non volatile or thermally unstable

Volatile or thermally stable

Non volatile or thermally stable

Volatile or thermally unstable

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

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Miscibility

Separation

contact

Solubility

Which concentration unit is independent of temperature.

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Molarity

Molality

ppm

both a and b

Kw for water at 0 oc is 0.1 x 10^-34 and at 100 ^oC 7.5 x 10^-14, How many times dissociation of water increase from 0 ^oCto 100 ^oC

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7.5 times

50 times

75 times

100 times

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

The iodine present in water can be separated by which one of the following techniques

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Sublimation

Chromatography

Filtration

Solvent extraction

The molar volume of CO₂is maximum at

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STP (0°C and 1 atm)

127° C and 1 atm

0°C and 2 atm

273°C and 2 atm

Quantum number values for 3p orbitals are.

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n = 0, l = 3

n = 3 , l = 1

n = 2, l = 1

n = 2 , l = 3

12.04 x 10²³atoms of nitrogen gas is equal to.

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1 mol

2 mol

3 mol

4 mol

If the salt bridge is not used between two half cells, then the voltage.

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Decrease rapidly

Decrease slowly

Drops to zero

Does not change

According to MOT, which molecular orbital has highest energy.

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sigma 1s

pi+ 2S

pi 2py

Pi+ 2px

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

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NaCl

CuSO4

Na2CO3

NH4Cl

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 solution of glucose is 10% The volume in which 1 g mole of it dissolved will be.

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1 dm3

1.8 dm3

900 cm3

200 cm3

The unit of Kc for the reaction N2 +O2 = 2NO will be

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mol dm-3

mol-1 dm+3

mol-2 dm+6

No units

Azeotrpic mixture of two liquids boils at a lower temperature than either of them, when

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It is saturated

Is shows positive deviation from Raoult's law

It shows negative deviation from Raoult's law

Is is metastable

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