9 Science Atoms And Molecules Test 01
Topics: Oxygen, Iron, Atom, Molecule, Chemistry, Aluminium / Pages: 4 (242 words) / Published: Dec 16th, 2014

CBSE TEST PAPER-01
CLASS - IX Science (Atoms and Molecules)

1.

Atomic radius is 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) I

3.

Atomicity of chlorine and Argon is

(c) Fe

[1]

(d) None of these

[1]
[1]

(a) Diatomic and Monoatomic

(b) Monoatomic and Diatomic

(c) Monoatomic and Monoatomic

(d) Diatomic and Diatomic

4.

Molecular mass of water ( H 2O ) is (a) 18g

5.

State law of conservation of Mass?

[2]

6.

Define Valency? Find the Valency of oxygen and Aluminum.

[2]

7.

Calculate the molar mass of Na2SO4 and CaCO3?

[2]

8.

Write the chemical formula for

[2]

(b) 8g

(c) 33g

(d) 34g

[1]

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

State the Postulates of Dalton Theory?

[3]

10.

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

[3]

11.

2.42g of copper gave 3.025g of a black oxide of copper, 6. 49g of a black oxide, on

[3]

reduction with hydrogen, gave 5.192g of copper. Show that these figures are in accordance with law of constant proportion?
12.

A compound was found to have the following percentage composition by mass
Zn = 22.65%, S = 11.15%, H = 4.88%, O = 61.32%. The relative molecular mass is
287g/mol. Find the molecular formula of the compound, assuming that all the hydrogen in the compound is present in water of crystallizations.

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[3]

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