Question # 1

The largest number of molecules are present in

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

When a nitrogeneous base combine with a sugar it is called

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Ribose

Nucleotides

Nucleoside

None

The process in which solid is directly coverted into gaseous state is called

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evaporation

boiling

sublimation

transformation

In the presence of hot alkaline potassium permanganate solution 2-butene will give

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Formic acid +acetic acid

Two moles ethanoic acid

Two moles of methanoic acid

Ethylene glycol

When vapour pressure is equal to atmospheric pressure than it is called

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Evaporation

M.P

B.P

Freezing point

Choose the example having hexagonal system:

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graphite

sugar

sulphur

diamond

Enthalpy of neutralization (∆H°n) per mole of H2SO4/ Ba(OH)2 is

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+57.4 kJmol-1

-114.8 kJmol-1

-57.4 kJmol-1

Irreversible precipitation of protein caused by heating is called

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Polymerization

Denaturing

Inversion

Co-angular

Which is not a calcareous material?

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lime

clay

marble

marine shell

Ether show the phenomenon of

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Positional isomerism

Functional group isomeris

Meta merism

Cis trans isomerism

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

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urea

ammonium nitrate

ammonium sulphate

ammonium chloride

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The reaction in which ketone is reduced to the alkane is called

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Kolb

Clemmensen

Cannizzaro

None

A pollutant affects

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Human health

Quality of life

Functioning of ecosystem

All of these

Alkyl halides react with Mg in dry ether to form

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Magnesium halide

Grignard's reagent

Alkene

Alkyne

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Three times

Six times

Nine times

Two times

pH of the human blood which is essentially maintained constant due to carbonates, biocarbonates, phosphates etc., is

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7.00

7.25

7.35

7.47

When the degree of freedom increase the entropy ______

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Decreases

Increases

Remains same

All

The reagent which forms crystalline osazone derivative when treated with glucose is

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Fehling solution

Phenyl hydrazine

Benedict solution

Hydroxyl amine

Source of organic compounds primarily is:

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Plants

Animals

Minerals

A & B

The energy of ionization of an atom is the energy difference between orbital

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The horizontal rows in the periodic table are called periods. The number of period are

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5

6

7

8

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