ATOMS AND MOLECULES -CLASS-9
Assessment
•
Santha S
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Science
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9th Grade
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2K plays
•
Medium
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10 questions
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1.
MULTIPLE CHOICE
30 sec • 1 pt
1.A sample of NH3 molecule irrespective of source contains 82.35% Nitrogen and 17.65% of Hydrogen by mass. This data supports:
2.
MULTIPLE CHOICE
30 sec • 1 pt
2.An element X is divalent and another element Y is tetravalent. The compound formed by these two elements will be:
3.
MULTIPLE CHOICE
30 sec • 1 pt
3.The molecular formula of potassium nitrate is ________.
4.
MULTIPLE CHOICE
30 sec • 1 pt
4.Molecular mass is defined as the:
5.
MULTIPLE CHOICE
30 sec • 1 pt
5.Which of the following represents a correct chemical formula of Sodium chloride
6.
MULTIPLE CHOICE
30 sec • 1 pt
6.The relative molecular mass of Na2S2O3.5H2O is
7.
MULTIPLE CHOICE
30 sec • 1 pt
7.The chemical symbol for sodium is
8.
MULTIPLE CHOICE
30 sec • 1 pt
8.The atomicity of K2Cr2O7 is
9.
MULTIPLE CHOICE
30 sec • 1 pt
9.The chemical symbol for nitrogen gas is
10.
MULTIPLE CHOICE
30 sec • 1 pt
10.The value of Avogadro’s constant is:
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