Question # 1

Keratomalacia is caused due to the d3eficiency of vitamin:

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A

B

K

D

organic synthetic or man made polymers are plastics, rubber and fibre, Which is not a synthetic polymer

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silk

polyester

polyvinyl chloride (PVC)

nylon

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

Photochemical smog contains----as main reactants

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Nitrous oxide & unburnt hydrocarbons

NO & brunt hydrocarbons

Nitric oxide & unburnt hydrocarbons

N2O & burnt hydrocarbons

Which one of the following is a water soluble vitamin?

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niacin

rioflavin

trypsin

ascorobic acid

Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called:

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heat of vaporization

latent heat of fusion

molar heat of fusion

molar heat of sublimation

Which of these the most widely used nitrogen fertilizer in Pakistan?

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urea

ammonium nitrate

ammonium sulphate

ammonium chloride

Which one is non-reducing sugar?

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sucrose

glucose

fructose

galactose

Which one of the following molecules show maximum hydrogen bonding?

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H₂O

H₂Se

H₂S

HF

Many petroleum products are:

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coloured

colourless

testy

poisoinous

Cotton is __________ % cellulose

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90

100

99

30

Ethyl alcohol may be identified by

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Ring test

Iodoform test

Tollen's test

Bazeyer's test

In passage of electricity through aqueous solution of AgNO₃silver dissolves at anode to form Ag⁺, the electrodes are

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Silver metal

Pt metal

Graphite

Copper metal

Aldehyde and small methyl ketones form crystalline ______ ppts with saturated sodium bisulphate solution

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White

Red

Yellow

None of these

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

The electronegativeities of F,Cl,Br and I are 4.0,3.0,2.8,2.5 respectively.Hydrogen halide with a high percentage of ionic character is

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HF

HCL

HBr

HI

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with

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Hund's rule

Markownikov's rule

Pauli's Exclusion principle

Auf ban principle

Glyptal polymer is obtained from glycerol on reacting with

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Malonic acid

Phthalic acid

Maleic acid

Acetic acid

The fibre which is made form acrylonitrile as monomer

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PVC

Rayon fibre

Acrylic fibre

Polyester fibre

Inn which of these processes are small organic molecules made into macromolecules?

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The cracking of petroleum fractions

The fractional distilation of crude oil

the polymerization of ethane

The hydrolysis of proteins

As the nuclear charge increases, the pull on the electrons is increased and size of an atom:

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Decreases.

Remain same.

Increases.

Is negligible.

Hydrocarbons are organic compounds which contain elements such as

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Hydrogen

Carbon

Hydrogen and carbon

Halogens

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