Question # 1

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

Dipole-induced dipole forces are also called

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dipole-dipole forces

ion-dipole forces

Debye forces

London-dispersion forces

Which of these polymer is synthetic polymer

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Animal fat

Starch

Cellulose

Polyester

If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to

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4P

P

2P

3P

Digestion of carbohydrates begins in the:

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large intestine

small intestine

duuoderium

beccal cavity/mouth

H2O and HF are the hydrides of the second period. Fluorine is more electronegative than oxygen. Anyhow, the boiling point of water is greater than that of HF. This is due to:

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water is more polar than HF

water has a bent structure

HF has a zig zag structure after making hydrogen bonding

the number of hydrogen bonds produced by water are greater than that of HF

Pressure remain constant at which temperature the volume of gas becomes twice of what it is at 0°C

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546 °C

546K

200°C

273K

Industrial effluents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

H₂effuses through a porous pot at a rate of 500 cm³per minute at 0°C.The rate of diffusion of O₂through the same vessel at 0°C per minute is

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500 cm³

250 cm³

1 dm³

125 cm³

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Which is not a bidentate ligand

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Chile saltpetre has the chemical formula

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NaNO₃

KNO₃

Na₂B₄O₇

Na₂CO₃H₂O

Which one of the following does not belong to alkaline earth metals

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Be

Ra

Ba

Rn

Classical smog occurs in palces of

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Excess SO₂

Low temperature

High temperature

Excess NH₃

The number of paper industries in Pakistan are

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30

25

35

20

Which one of the following gases is used for artificial ripening of fruits ?

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Ethane

Ethyne

Methane

Propane

Benzene was discovered by Michael Faraday's in

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1824

1825

1826

1827

Reduction of alkyl halides give

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Alkanes

Alkenes

Ketones

Ether

The human body can synthesize ______ amino acids

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1

10

20

19

Primary and secondary alcohols on action of red hot copper give

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Aldehydes and ketones respectilvely

ketones and aldehydes respectively

Only aldehydes

Only ketones

The increase in size of the anion is due to:

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Increase in electron-electron repulsion

Increase in valence shell electrons.

Decrease in valence shell electrons.

Both (a) and (b).

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