Question # 1

Law fo conservation of mass was put forward by

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Newton

Plank's

Lavoisier

Einstein

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

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

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Water

Energy

Glucoe

CO2

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

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O2

H2O

Glucose

Energy

Law of conservation of mass put forward in.

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1783

1784

1785

1786

Exothermic reaction ae those reactions durng which heat is.

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Given out

Remain same

Absorbed

Used

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

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

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

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Addition

Exothermic

Endothermic

Decomposition

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

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

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Left

Right

Upward

Both side

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

Substancs whihc take part in a chemical reaction are called.

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Products

Ractants

Elements

Compunds

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

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2

4

6

8

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

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

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

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