Question

SESSION 2020-21
CLASS - IX
SUBJECT -SCIENCE (Atom and Molecules)
ROOM NO=302
MULTIPLE CHOICE QUESTIONS: (1 MARKER)
A sample of pure water, irrespective of its source contains 11.1% hydrogen and 88.9% oxygen. The
data supports
(a) law of constant proportions
Slaw of conservation of mass
(c) law of reciprocal proportions
(d) law of multiple proportions
The formula of chloride of a metal Mis MC13, then the formula of the phosphate of metal M will be
(a) MPO4
(b) M2PO4
(c) M3PO4
identify the correct statements.
In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always 8:1.
If 9 g of water is decomposed, 1 g of hydrogen and 8 g of oxygen are always obtained.
In ammonia, nitrogen and hydrogen are always present in the ratio 3:14 by mass.
Many compounds are composed of two or more elements and each such compound has the same
elements in the same proportions.
(c) 2 and 4
(d) All of these
nolecule?
MA (PO4)
(a) 1 and 3
(b) 1, 2 and 3​

Answer 1

Answer:

A sample of pure water, irrespective of its source contains 11.1% hydrogen and 88.9% oxygen. The

data supports

(a) law of constant proportions

Answer: (b)law of conservation of mass

(c) law of reciprocal proportions

(d) law of multiple proportions

The formula of chloride of a metal Mis MC13, then the formula of the phosphate of metal M will be M3PO4.

Answer:(a) MPO4

(b) M2PO4

(c) M3PO4

identify the correct statements.

In a compound such as water, the ratio of the mass of hydrogen to the mass of oxygen is always 8:1.

If 9 g of water is decomposed, 1 g of hydrogen and 8 g of oxygen are always obtained.

In ammonia, nitrogen and hydrogen are always present in the ratio 3:14 by mass.

Many compounds are composed of two or more elements and each such compound has the same

elements in the same proportions.

(c) 2 and 4

Answer:(d) All of these

nolecule?

MA (PO4)

(a) 1 and 3

(b) 1, 2 and 3