Question # 1

Freshly cut metals have a shining surface because

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electrons excited, then excited electrons release energy as light

metals have brittle nature

metals conductivity increases

metals are malleable and ductile

An ester is prepared by:

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two alcohols

carboxylic acid and alcohol

ketone and alcohol

aldehyde and alcohol

What is the effect of polluted air on environment:

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ozone

acid rain

global warming

smog

The gecko a small lizard can up a smooth glass window the gecko has millions of microscopic hairs on its toes and each hair has thousand of pads at its tip the result is that the molecules in the pad are extremely close to the glass surface on which the gecko is climbing.

What is the attraction between the gecko is climbing.

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co-ordinate bonds

covalent bonds

ionic bonds

van der Waals forces

Which is not a calcareous material:

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Lime

Marble

Clay

Marine shel

Which one of the followings has polar covalent bonds hut is overall nom-polar molecule:

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HF

CO₂

CH₄

N₂

Denaturation of protein means the structure of protein is disrupted indicate which factor does not denature protein

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Oxidizing agent

Heat protein

Keeping pH 7.35

pH changes

Benedict solution gives a positive test with

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Glucose

Fructose

Sucrose

Starch

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

In which of the following types of reactions are the carbonyl compounds and alkene are similar in behaviour

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Nucleophilic addition

Electrophilic addition

Nucleophilic suhstitution

Catalytic hydrogenation

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

NaHCO₃is commonly called

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Soda ash

Baking soda

Washing soda

None of these

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

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Paschen

Pfund

Balmer

Brackett

Chlorobenzene on heating with aqueous NH₃under pressure in the presence of cuprous chloride gives

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Benzamide

Nitrobenzene

Aniline

Chloroaminobenzene

Which one of the following is not an example of chain growth polymer?

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Neoprene

Bunna-S

PMMA

Glyptal

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

When a colourless gas is passed through bromine water only decolourisation takes place the gas is

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SO₂

HBR

HCl

H₂S

The compound which gives oxygen on moderate heating is

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Zinc oxide

Mercuric oxide

Aluminium oxide

Ferric oxide

A compound is soluble in conc. H₂SO₄, it does not decolourise bromine in carbon tetrachloride but is oxidized by chromic anhydride in aqueous sulphuric acid within two seconds, turning orange solution to blue, green and then opaque. The original compound is

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Primary alcohol

Tertiary alcohol

alkene

ether

Which of the following reactions is used for detecting presence of carbonyl group?

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Reaction with hydroxylamine

Reaction with hydrazine

Reaction with phenyl hydrazine

All

Shahi Qilla may be destroyed by

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Flood in Ravi

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

All the above

Depletion of ozone is more during the month:

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Jan - March

April - Ju8n

July - Aug

Sept - Nov

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