MCQ Question Quiz For Class 9 Science (chemistry) Chapter - 3 Atoms and molecules. CBSE NCERT Special For Exam Ncert class 9 Atom And Molecules in english solutions.Class 9 atom And Molecules MCQ
The atomic theory of matter was proposed by:
A. John Kennedy
B. Lavoisier
C. Proust
D. John Dalton
The symbol of a metal element which is used in making thermometers is:
A. Ag
B. Hg
C. Mg
D. Sg
The Latin language name of an element is natrium. The English name of this element is:
A. sodium
B. potassium
C. magnesium
D. sulphur
The English name of an element is potassium, its Latin name will be:
A. plumbum
B. cuprum
C. kalium
D. natrium
The law of conservation of mass was given by:
A. Dalton
B. Proust
C. Lavoisier
D. Berzelius
The law of constant proportions was given by:
A. Proust
B. Lavoisier
C. Dalton
D. Berzelius
One nm is equal to:
A. 10-⁹ mm
B. 10-⁷cm
C. 10-⁹cm
D. 10-⁶ m
The scientist who proposed the letter (or first letter and another letter) of the Latin or English name of an element as its symbol, was:
A. Dalton
B. Proust
C. Lavoisier
D. Berzelius
The atoms of which of the following pair of elements are most likely to exist
in free state?
A. hydrogen and helium
B. argon and carbon
C. neon and nitrogen
D. helium and neon
Which of the following elements has the same molecular mass as its atomic
mass?
A. nitrogen
B. neon
C. oxygen
D. chlorine
One of the following elements has an atomicity of ‘one’. This element is:
A. helium
B. hydrogen
C. sulphur
D. ozone
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