Question # 1

What is the formula of silica?

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Si2O3

SiO2

Si3O4

SiO-

In which of the following compounds H-binding is not present?

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ethanol

ether

water

ammonia

The basic distinction between solids, liquids and gases lies in difference between.

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Strength of the bonds

Size of molecules

space which the molecules occupy

All of above

Sponification is the hydrolysis of fast or fats or4 oils with an/a:

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acid

alkali

enzyme

metallic ion

About 25% of earth crust mass is made up of element

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Oxygen

Silicon

Aluminium

Aluminates

Hardness of diamond is attributed to the

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strength of the ionic bonds in the structure

three-dimensional network of covalent bonds

absence of valence electrons in carbon atoms

Choose from the followings the correct statement about Born Haber cycle

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Born Haber cycle is different from Hess's law

The energy changes in a cyclic process is not zero

The lattice energy of crystalline substances can be calculated easily

None

By increasing the concentration of reactants, the rate of reaction

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Decreases

Increases

Remains constant

Not predicted

The optimum pH value for the enzyme pepsin is

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10

1.4

8

6

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

one gram of carbohydrate yields energy:

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10kcal

100kcal

4kcal

9kcal

Soft drinks and baby feeding bottles are generally made up of

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Polyester

Polyurethane

Polyurea

Polystyrene

The detection of functional group is called:

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Numerical analysis

Qualitative analysis

Quantitative analysis

Combustion analysis

Which of the following has greatest tendency to lose electron?

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F

Fr

S

Be

What is the total number of different chloroethanes, formula C₂H_6-nCl_n, where n can be any integer from 1 to 4

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4

6

7

8

The alkaline earth elements have in their s-orbital

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One electron

Two electron

No electron

Three electron

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

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Initial concentration of acetic acid

Initial concentration of ethyl acetate

Equilibrium concentration of acetic acid

Equilibrium concentration of ethyl acetate

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Temperature is increased

Pressure is increased

HCl is added

HCl is removed

An ionic compound A+B is most likely to be formed when

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The ionization energy of A is high and electron affinity of B is low.

The ionization energy of A is low and electron affinity of B is high.

Both ionization energy of A and electron affinity of B are high.

Both ionization energy of A and electron affinity of B are low.

Which decolourizes the colour of Br₃

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CH₄

CH_3-CH₃

CH_3-CH_3-CH₃

CH₂₌CH₂

According to modern theory of chemical bonding atoms form bonds as it leads to a:

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Increase in energy.

No energy change.

Decrease in energy.

First decrease then increase in energy.

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