Question # 1

Formula of Urea is.

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KCNO

H₂N-CO-NH₂

HN-CO₂-NH

H₃N-CO-NH₃

Marsh gas is mostly :

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ethane

methane

butane

propane

Which is the substitution reaction in the following?

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Halogenation of alkenes

Halogenation of alkynes

Bromination of alkene

Halogenation of alkanes

Which is present 85% in natural gas?

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Ethane

Propane

Methane

Butane

A strange bitter smell noticed near photocopiers is of:

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SO2

H2S

O2

O3

Alkanes are least reactive compounds because they are.

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Saturated hydrocarbons.

Unsaturated hydrocarbons.

Both a and b

None of the above.

The sphere just above the Earth's surface is.

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Mescosphere

Stratosphere

Thermosphere

Troposphere

Concentration is a .

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Mixing technique

Separating technique

Boiling technique

cooling technique

Nucleic acids made up of long chain of.

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Nucleotide

Fatty acids

Amino acid

None of them

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

When the number of moles of both sides are equal in a reaction then the unit of Kc will be:

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no unit

mol-2 dm6

mol dm3

mo-2 dn

When a reaction ceases to proceed further , it is called.

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Chemical states

Static state

Physical state

Dynamic equilibrium state

Sindh alkalies limited was established near Karachi in.

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1965

1966

1970

2000

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