Question # 1

The mass of one molecule of water is:

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18 amu

18g

18mg

18kg

___________ is a pure substance that can be broken down.

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Matter

Element

Mass

Mixture

Which is a polar molecule?

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HCI

H₂

CI₂

O₂

The number of proton in an atom is called _________ number.

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Molecule

Formula

Atomic

Molar

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

_________ which occupies space and have mass.

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Matter

Atom

Molecule

All of above

Which one is largest?

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Exo

Peta

Atto

Pico

An atom having six electrons in its achieve noble electronic configuration by:

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gaining one electron

losing all electrons

gaining two electrons

losing two electrons

Number of protons+ neutrons is :

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Atomic mass

Mass numbers

Both

Nil

Gases have ____________ shape.

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Fixed

Not Fixed

Nil

Both a & b

The repetition of a property after a certain interval is:

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Periodicity

Properties

Periodicity of properties

None

The lives of aquatic plants and animals are indirectly related to concentration of dissolved ------ in water:

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hydrogen

oxygen

chlorine

nitrogen

Glucose and fructose are;

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trioses

tetroses

pentoses

hexoses

Formula of palmitic acid is.

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C₁₅H₃₁COOH

C₁₂H₃₅COOH

C₁₅H₃₀COOH

C₁₇H₃₄COOH

The product of any Lewis acid-base reaction is a single specie called:

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free radical

adduct

molecular ion

conjugate

How many units are in Pakistan for manufacturing of Urea.

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3

6

9

12

Neurological damage is caused by the poisoning of.

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Lead

Cadimium

Mercury

All of them

Number of vitamins in vitamin B complex is.

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10

8

6

12

Hook warm larvae enter the body through.

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Food

Water

Skin

All of them

The reaction between an acid and a base produces.

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Salts and water

Salt and gas

Salt and an acid

Salt and an base

Word "acid" derived from:

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Urdu

English

Latin

Greek

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

The true representation for the units of rate constant K for the first order reaction

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sec^-1

mole dm^-3s

mole dm^-3s^-1

mole^-1dm⁺³s^-1

The molecule having zero dipole moment is.

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NH3

CHCl3

H2O

BF3

When concentration of one product is removed at equilibrium stage, in which direction it moves to reestablish equilibrium.

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Forward

Reverse

Neither forward nor reverse

Equally move in both direction

At constant volume of a system remains constant and the heat is absorbed by the system, them amount of heat absorbed is called

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Enthaply change of the system

Internal energy change of the system

Total enthalphy of the system

Total internal energy of the system

In which compound the oxidation number of Mw is +6

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KMnO4

K2MnO4

MnO2

MnO

Which one of the following molecules is paramagnetic.

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H2

He

N2

O2

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

Which one of the following salts dissolved in water to form a solution with a pH greater than 7

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NaCl

CuSO4

Na2CO3

NH4Cl

Density of a gas is usually expressed in

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kg m-3

kg dm-3

g dm-3

g cm-3

The molecules of CO₂in dry ice form the

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Ionic crystal

Covalent crystals

Molecular crystals

Any type of crystals

Cathode rays strike alumina and produce a ..........colour.

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Red

Blue

Yellow

Green

Which substance is used in photography

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AgCl

AgBr

AgI

Ag3PO4

The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water

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KMnO₄

O₃

Alums

Chloramines

In Pakistan, the total consumption of paper per person per year is.

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2 kg

5 kg

7 kg

10 kg

Which gas has highest boiling points.

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He

Ne

Ar

Kr

Co-ordination number of Pt in Pt Cl(NO₂)(NH₃)₄

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2-

4

1

6

Which is simplest amino acid

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Alanine

Protein

Lysine

Glycine

The macronutrients are required in quantities ranging from

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4-40 kg per acre

10-100 kg per acre

5-100 kg per acre

5-200 kg per acre

Grignard's reagent is reactive due to

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the presence of halogen atom

the presence of Mg atom

the polarity of C-Mg bond

none of the above

The percentage of nitrogen in urea is.

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36%

46%

56%

65%

The substance which is added to remove impurities is known as

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Slag

Flux

Ore

Gangue

Aluminium does not corrode because.

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It is a semi metal

It is a silver shining metal

It does not react with O2

It forms a protective layer of Al2O3