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Chemistry 10th Class English Medium Unit 9 Online Test MCQs With Answers

Question # 1

The substances formed during the chemical reaction are called.

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Product

Reactants

Radicals

Element

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Question # 2

An equilibrium is achievable only in a:

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big system

small system

open system

closed system

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Question # 3

In a chemical reaction, the substance that combine are called.

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Reactant

Products

Mass

Material

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Question # 4

The reaction in which the products can recombine to form reactants are called.

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Reversible reaction

Irreversible reaction

Decomposition

Addition

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Question # 5

The color of Iodine is:

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Purple

Black

Red

Pink

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Question # 6

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

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hydrogen

oxygen

chlorine

nitrogen

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Question # 7

When CaCO_3,.is heated in an open flask, it decomposes to form calcium oxides and .

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O₂

CO₂

CO₃

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Question # 8

A dynamic equilibrium

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Reaction stops to proceed

Amounts of reactants and products are equal

Rate of forward and reverse reaction are equl

Reaction can no longer be reversed.

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Question # 9

Such reactions which continue in both directions are called.

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Irreversible

Reversible

Nonreactive

Dynamic

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Question # 10

Equilibrium constant value "K" is equal to:

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Kt / Kr

Ki / Kr

Kc / Qc

Qc /Kc

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Question # 11

Which chemical is called king of chemicals?

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KNO₃

H₂SO₄

HCl

NHO₃

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Question # 12

The reaction in which the number of moles reactants and products not equal in balance chemical equation the units of Kc for this reactions are

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mol^-2

dm³

mol²

mol dm^-1

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Question # 13

In the beginning the rate of reverse reaction is

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Negligible

Moderate

Very fast

Slow

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