Question # 1

Which ion cause water hardness?

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Al²

Mg²

Fe²

Na²

Forest fires and burning of wood emit.

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CO₂

NO₂

SO₂

Cl₂

Atmosphere is divided into;

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3 regions

4 regions

5 regions

6 regions

Blonde hair contains compounds of:

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molybdenum

iron

titanium

copper

The end product of oxidation of acetylene is.

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Propen glycol

Ethan glycol

Glyoxal

Oxalic acid

When acid react with carbonates and bicarbonates which gas is evolved?

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H2

CO₂

Cl₂

N₂

The strong heating of coal in the absence of air is called.

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Carbonization

Destructive distillation

Fractional distillation

All

Which type of reactions do not go to completion?

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Irreversible reaction

Reversible reactions

Addition reactions

Decomposition reactions

The formula of ozone is.

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O₂

O₃

O

CO

The green house effect is proportional to the amount of which gas in air.

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CO₂

O₂

N₂

All of them

Almost all aircrafts fly in:

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troposphere

mesosphere

stratosphere

themosphere

Such reationsin which reactants and products are sufficient in quantities the Kc value of equilibrium state will be

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Very small

Very large

Moderate

None of these

A conjugate acid is a specie formed by accepting a.

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Proton

Electron pair

Neutron

Electron

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10th Class Chemistry English Medium KPK Boards Online Mcqs MCQs With Answers

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