Question

1.Following is a series of non-metals
a. carbon, sodium, hydrogen
b. nitrogen, oxygen, silver
c. hydrogen, oxygen, nitrogen
d. nitrogen, potassium, calcium


2.-------------has the fixed composition
a. elements
b. mixture
c. compounds
d. both elements and compounds


3.Iron and suphur mixture on treating with dilute hydrochloric acid release a

gas.This gas is

a. hydrogen gas

b. hydrogen sulphide gas

c .ferrous chloride gas

d. chlorine gas



4.Which of the following are chemical changes

I.hammering of wood

II.cooking of food

III.sawing of wood

IV.burning of wood

a.I and II

b. II and III

c.III and IV

d.II and IV



5. Which of the following are homogeneous in nature

I-ice

II-wood

III-soil

IV-air

a.I and II

b.II and IV

c.I and IV
d. III and IV




6. A mixture of sulphur and carbon di sulphide is

a. heterogeneous and shows Tyndall effect

b. homoogeneous and shows Tyndall effect

c. heterogeneous and does not show Tyndall effect

d. homogeneous and does not shows Tyndall effect




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Answer 1

Answer:

1. nitrogen, oxygen, hydrogen

2. elements

3. ferrous chloride gas

4. 2 and 4

5. air and wood

6. homogeneous and shows tyndall effect

Explanation: