Question # 1

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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low value

higher value

both values

none of these

The alkaline earth metals are called so because they

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form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

Vapour pressure is not affected by

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Surface area

Intermolecular forces

Temperature

Nature of liquid

Amino acids ionize in water to form

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Zwitterion

Internal saH

Dipolar ion

All of these

Which of the following is not molecular crystal

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Sugar

Iodine

Ice

Graphite

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

Property due to which water acts as a universal solvent is

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Polarity

It's ability to make hydrogen bond

Both A and B

Strong dipole dipole interaction

Nihydrin reacts with amino acid to give product of

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Bluish color

Violet color

Bluish violet color

No color

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

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same as that of a hydrogen molecule

half that of a hydrogen molecule

two times that of a hydrogen molecule

four times that of hydrogen molecule

According to charles law there will be a change in the volume of a given mass of a gas by 1/273 of its original volume at 0°C if the temperature of the gas is changed by

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10°

1°C

100°C

2°C

Palmitic acid & steanic acid ae obtained from process of fats & oils:

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Reduction

Neutralization

oxidation

hydrolysis

Grignard reagent on reaction with a ketone forms

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Tertiary alcohol

Secondary alcohol

Primary alcohol

Carboxylic acid

Sometimes a yellow turbidity appears while passing H₂S gas even in the absence of II group radicals. This is because

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Sulphur is present in the mixture as impurity

IV group radicals are precipitated as sulphides

Of the oxidation of H₂S gas by some acid radicals

III group radicals are precipitated as hydroxides

The bond angle H - O - H in ice ins closest to

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120° , 28^'

60°

90°

109°

Na reacts with phenol to produce

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H₂gas

Benzene

CO₂gas

CO gas

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+712 KJ mol^-1

+492 KJ mol^-1

-932 KJ mol^-1

-960 KJ mol^-1

The horizontal rows in the periodic table are called periods. The number of period are

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5

6

7

8

Which of the following is directly related with entropy

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Pressure

Degree of freedom

Temperature

Both b and c

The sum of mole fractions (X) of components of solution is equal to

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100

200

One

Zero

The raw materials for the manufacture of urea fertilizer is

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Hydrogen and ammonia

Steam, methane, ammonia

Methane and air

None of these

In exothermic reaction decrease in potential energy of the products will result in

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Decreases in kinetic energy of the particles

Increases in kinetic energy of the particles

No change in kinetic energy

Decreases in activation energy

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