Question # 1

The reaction of formaldehyde with HCN is

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Nucleophilic substitution

Electrophilic substitution

Nucleophilic addition

Free radical addition

For a chemical reaction to occur

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The vessel shall be open

Reacting molecules should have less energy than Ea at time of collision

Reacting molecules must be properly oriented and energy more than or equal to Ea

The reacting molecules must not collide with each other

Protein may have

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Primary structure

Secondary structure

Tertiary structure

All of these

What is the morality of a solution containing 15g of urea is 500cm³ of solution?

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1M

0.5M

2M

1.5M

The total pressure exerted by a mixture of gases is the sum of the partial pressure of all the gases present is a statement of

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Charle's Law

Boyle's Law

Dalton's Law

Graham's Law

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to

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increase in average molecular speed

increase in number of moles

increase in molecular attraction

decrease in the distance between the molecules

The primary building blocks of lipids are

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Fatty acid

Glycerol

Sterols

All

Water bodies are included in:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Substance which is formed as well as consumed during a chemical reaction and have temporary existence.

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Reactant

product

Catalyst

Intermediate

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

At constant temperature, volume of given mass of gas in inversely proportional to pressure on it. This statement is according to:

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Hook's law

Graham's law

Bolye's law

Charle's law

Non-formation of menisus by Hg in presence of O₃is due to the formation of

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Mercuric oxide

Mercurous oxide

Mercuric chloride

Mercurous chloride

Domestic waste mostly constitutes

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Non-biodegradable pollution

Biodegradable pollution

Effluents

Air pollution

Which of the following is not an electrophitic substitution reaction of benzene

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Nitration

Sulphonation

Fridel-Craft alkylation

Free radical chlorination of benzene

Boiling point of acetic acid is°C:

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116

117

118

119

Atomic number of Al is 13. When it forms ionic bond with oxygen the number of electrons lost by 1 Al atom is

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1

2

3

4

Which class of compound is more reactive

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Alkane

Alkene

Alkyne

None

Metallic conduction is also called as :

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Ionic conduction.

Protonic conduction.

Electronic conduction

Super conduction

Cannizzaro reaction is not given by

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Trimethyl acetaldehyde

Acetaldehyde

Benzaldehyde

Formaldehyde

Chloroflurocarbon releases a chemical harmful to ozone

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Fluorine

Chlorine

Nitrogen peroxide

Sulphure dioxdie

Al is the most element in earth crust:

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O

Si

Al

Pb

The cement plants in west Pakistan at the time of creation were:

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Ten

Twenty

Four

Twenty four

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