Question # 1

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

Choose an answer

O2

H2O

Glucose

Energy

Law of conservation of mass put forward in.

Choose an answer

1783

1784

1785

1786

Substancs whihc take part in a chemical reaction are called.

Choose an answer

Products

Ractants

Elements

Compunds

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

Choose an answer

Zinc oxide and water

Zinc sulphide and water

Zinc sulphate and hydrogen

Zinc sulphide and hydrogen

Heating of solid potassium chlorate produces a gas.

Choose an answer

Chlorine

Carbon dioxide

Carbon mono oxide

Oxygen

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

Choose an answer

Additon reaction

Decomposition

Replacement reaction

Balanced reaction

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

Choose an answer

Addition

Exothermic

Endothermic

Decomposition

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

Choose an answer

Carbon dioxide and hydrogen

Carbon monoxide and hydrogen

Carbon di oxide

Carbon dioixe and water

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

Choose an answer

Left

Right

Upward

Both side

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

Choose an answer

Law of conservation of momentum

Law of conservation of energy

Law of conseration of mass

Law of conseration of acceleration

Exothermic reaction ae those reactions durng which heat is.

Choose an answer

Given out

Remain same

Absorbed

Used

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

Choose an answer

Quadratic equation

Unbalanced equation

Balanced equation

Standard equation

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

Choose an answer

2

4

6

8

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

Choose an answer

Water

Energy

Glucoe

CO2

Law fo conservation of mass was put forward by

Choose an answer

Newton

Plank's

Lavoisier

Einstein

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

Choose an answer

Decomposition reaction

Addition reaction

Acid-Base reaction

Neutralizaion reaction

Thermal decompositionof calcium carbonate produces a gas.

Choose an answer

Oxygen

Carbon di oxide

Nitrogen

Carbon monoxide

More Classes

Other Links

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

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer