Question

Comprehension type questions
a)
The chemical equations are of two types. These are
i) Word equation : Word equations represent simple change of reactants into products. A
word equation links together the names of the reactants with those of the products,
Symbol equation : A brief representation of a chemical reaction in terms of symbols and
formulae of the substances involved is called chemical equation.
1. xFe +
yH, → ZF, + WH
What are x, y, z and w respectively ?
[ ]
a) 1, 2, 3, 4
b) 2,3,1,2
c) 3,4, 1,4
d) 3,3,3,3
2.
The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This
law known as
[ ]
a) law of conservation of momentum
b) law of conservation of mass
c) law of conservation of motion
d) law of conservation of magnetism
3.
Glucose + Oxygen carbondioxide + water. The number of molecules of glucose required for the
formation of 12 molecules of CO, is
[ ]
b) 12
d) 2
a) 6
c) 24​

Answer 1

Answer:

1. xFe + yH2O gives zFe304 + wH2

3Fe + 4H2O gives Fe3O4 + 4H2

Hence, x = 3

y = 4

z = 1

w = 4

2. (b) law of conservation of mass

3. 2C6H12O6 + 12O2 gives 12CO2 + 12H2O

Ans. (d) 2

Hope it helps you!