Question # 1

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

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Water

Energy

Glucoe

CO2

Law fo conservation of mass was put forward by

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Newton

Plank's

Lavoisier

Einstein

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

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O2

H2O

Glucose

Energy

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

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Left

Right

Upward

Both side

Law of conservation of mass put forward in.

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1783

1784

1785

1786

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

Thermal decompositionof calcium carbonate produces a gas.

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Oxygen

Carbon di oxide

Nitrogen

Carbon monoxide

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

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Addition

Exothermic

Endothermic

Decomposition

Substancs whihc take part in a chemical reaction are called.

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Products

Ractants

Elements

Compunds

Heating of solid potassium chlorate produces a gas.

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Chlorine

Carbon dioxide

Carbon mono oxide

Oxygen

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

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