Atoms and Molecules MCQ Practice Test – Science Class IX (Free)

Arrange the 3 samples of 4 gms of methane, 4 gms of oxygen gas and 4 gms of water in the order of which one has maximum number of molecule to the one which has minimum number of molecules

Law of constant proportions was given by

Dalton
Proust
Lavoisier
Bohr

Which pair represents diatomic elements?

Chlorine & Bromine
Oxygen & Nitrogen
Hydrogen & Iodine
All are diatomic

Molecular mass of

is

2 u
16 u
18 u
34 u

Symbol for silver is derived from its Latin name, which is

Aurum
Argentum
Aurga
Agram

An element X forms a compound

with hydrogen. What is the valency of Hydrogen and X respectively?

2 & 1
1 & 2
2 & 4
1 & 4

Which one of the following is a trivalent anion?

Nitride
Sulphite
Hydride
Nitrite

Formula of the Aluminium salt of an anion X is

, what will be the formula of magnesium salt of X?

Information not sufficient

Dalton’s symbol ‘

’ represents

Silver
Sulphur
Sodium
None of these

Which law of chemical combination was given by Lavoisier?

Law of conservation of mass
Law of constant proportion
Law of multiple proportions
None of these

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