Question # 1

Enzymes are

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Proteins

Mineral

Oils

Fatty acids

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

CsI

CsF

The pore size of the filter paper depends upon

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Nature of the medium

Temperature of the medium

Size of the particles

Mass of the particles

By using the fluted filter paper rate of filtration is

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Increased

Decreased

Filtration is constant

Having no effect

With increasing principle quantum number the energy difference between adjacent energy levels in H atom

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Decreases

Increases

Remains constant

Decreases for low value of Z and increases for higher value of Z.

In N.W.F.P the phosphate fertilizer are produced at

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D.I.Khan

Haripur

Nowshera

Dargai

Bragg's law is given by equation

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n λ = 2 θ sin θ

n λ = 2 d sin θ

2nλ = d sin θ

nλ = 1/2 d sin θ

For the carbylamine reaction we need hot alc.KOH and

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Any amin and chloroform

Chloroform and Ag powder

A primary amine and chloroform

A mono alkyl amine and trichlorom-ethane

The number of oxygen atoms in 4.4 g of CO₂ is approximately

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1.2 x 10²³

6 x 10²²

6 x 10²³

12 x 10²³

Red lead is

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PbO

Pb₃O₄

PbO₂

Pb₄O₃

Evaporation of water is

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An exothermic change

An endothermic change

A process where no heat changes occur

A process accompanied by chemical

Tollen's reagent is

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Ammonical cuprous chloride

Ammonical cuprous oxide

Ammonical silver bromide

Ammonical silver nitrate

SO₂ and NO₂produce pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

The percentage of nitrogen in urea is

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46

60

70

80

Iron, once dipped in concentrated H₂SO₄, does not displace copper from copper sulphates solution, because

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It is less reactive than copper

A layer of sulphates is deposited on it

An inert layer of iron oxide is deposited on it.

All valence electrons of iron are consumed.

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Which of the following compounds has the lowest anion to cation size ratio?

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LiF

NaF

Csl

CsF

Potassium is kept in

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Water

Ammonia

Alcohol

Kerosene.

In N.W.F.P the phosphate fertilizers are produced at

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D.I.Khan

Haripur

Nowshera

Dargai

Which of the following alcohols cannot be produced by treatment of aldehydes or ketones with NaBh₄or LiAH₄?

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1-Propanol

2-Propanol

2-Methyl2-Proponal

Ethanol.

Leblanc process is employed in the manufacture of

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Baking soda

Washing soda

Potash

Plaster of paris

Which is the most volatile compound?

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HI

HCl

HBr

HF

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