9 Science Atoms And Molecules Test 01

CBSE CHECK PAPER-01

SCHOOL - IX Science (Atoms and Molecules)

1 .

Atomic radius is usually measured in nanometers and

(a) 1nm = 10-10m

(b) 1m = 10-10nm

(c) 1m = 10-9nm

(d) 1nm = 10-9m

2 .

Symbol of Iron is: - (a) Ir

(b) We

3.

Atomicity of chlorine and Argon is

(c) Fe

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(d) None of these

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(a) Diatomic and Monoatomic

(b) Monoatomic and Diatomic

(c) Monoatomic and Monoatomic

(d) Diatomic and Diatomic

4.

Molecular mass of normal water ( They would 2O ) is (a) 18g

five.

State regulation of preservation of Mass?

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6.

Define Valency? Find the Valency of oxygen and Aluminum.

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7.

Determine the molar mass of Na2SO4 and CaCO3?

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8.

Write the chemical solution for

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(b) 8g

(c) 33g

(d) 34g

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a) Calcium Phosphate b) Magnesium (mg) Hydroxide c) Aluminum chloride. 9.

Condition the Postulates of Dalton Theory?

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10.

Get the percentage of water of crystallization in feSO4. 7H2O.

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14.

2 . 42g of copper gave 3. 025g of the black oxide of birdwatcher, 6. 49g of a dark-colored oxide, on

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lowering with hydrogen, gave your five. 192g of copper. Show that these statistics are according to law of constant percentage?

12.

A compound was found to achieve the following percentage composition by mass Zn = 22. 65%, S = 10. 15%, L = 4. 88%, U = sixty one. 32%. The relative molecular mass can be 287g/mol. Discover the molecular formula of the compound, let's assume that all the hydrogen in the mixture is present in water of crystallizations.

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