Question # 1

Thermal decompositionof calcium carbonate produces a gas.

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Oxygen

Carbon di oxide

Nitrogen

Carbon monoxide

Heating of solid potassium chlorate produces a gas.

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Chlorine

Carbon dioxide

Carbon mono oxide

Oxygen

Law fo conservation of mass was put forward by

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Newton

Plank's

Lavoisier

Einstein

Carbon burns in air to release energy along with the formation of.

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Carbon dioxide and hydrogen

Carbon monoxide and hydrogen

Carbon di oxide

Carbon dioixe and water

The product fo the reaction between zinc and dilute sulphuric acid are.

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Zinc oxide and water

Zinc sulphide and water

Zinc sulphate and hydrogen

Zinc sulphide and hydrogen

During photosynthesis in plants, carbon dioxide CO2 and water react to produce.

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Water

Energy

Glucoe

CO2

The equation in which the number of atoms of each element on both sides are not equal is called.

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Quadratic equation

Unbalanced equation

Balanced equation

Standard equation

How many oxygen atoms are present in onw molecule of Mg(HCO3)2

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2

4

6

8

The reaction between calcium oxide and carbon dioxide to form calcium carbonate is an example of.

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Decomposition reaction

Addition reaction

Acid-Base reaction

Neutralizaion reaction

Exothermic reaction ae those reactions durng which heat is.

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Given out

Remain same

Absorbed

Used

Symbol and formulae of the reactants are written on....... side fo arrow.

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Left

Right

Upward

Both side

Fire works is an example of ........... reactions.

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Addition

Exothermic

Endothermic

Decomposition

When methane is burnt in air, CO2 and.......... are formed.

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O2

H2O

Glucose

Energy

Substancs whihc take part in a chemical reaction are called.

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Products

Ractants

Elements

Compunds

The chemicla reaction during which a compound splits up into two or more simple substanes, is called.

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Additon reaction

Decomposition

Replacement reaction

Balanced reaction

Law of conservation of mass put forward in.

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1783

1784

1785

1786

During a chemical reaction, total mass of the product is equal to the total mass of reactants, this is a statements of.

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Law of conservation of momentum

Law of conservation of energy

Law of conseration of mass

Law of conseration of acceleration

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Science 8th Class English Medium Chapter 6 Online Test MCQs With Answers

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