Atoms And Molecules Quiz Questions
Hi students. . . . These is a free online test submitted by CHEMISTRY AT 9. . . . . . . BEST OF LUCK
- 1.If 92.6g of mercury reacts with 7.4g of oxygen then what will be the mass of mercuric oxide?
- A.
100g
- B.
92.4g
- C.
7.4g
- D.
7g
- 2.If 8.4g of magnesium carbonate on heating gave 4.4g of carbon dioxide and 4.0g of magnesium oxide. These agreement are in agreement with______________
- A.
Law of constant proportion
- B.
Law of conservation of mass
- C.
Law of multiple proportion
- D.
Gay lussac's law
- 3.Which of the following is one of the drawback of dalton's atomic theory?
- A.
Matter is made up of atoms
- B.
Atoms are indivisible
- C.
Atom is neither created nor destroyed
- D.
An element consists of only one type of atoms
- 4.The molecular mass of ozone is
- A.
32 u
- B.
16 u
- C.
54 u
- D.
48 u
- 5.What is the symbol of sodium and copper?
- A.
N and C respectively
- B.
S and C respectively
- C.
Na and Cu respectively
- D.
Na and Co respectively
- 6.The number of atoms present in a molecule of a substance is
- A.
Molecularity
- B.
Atomicity
- C.
Valency
- D.
Reactivity
- 7.What is the valency of cabon in carbon dioxide
- A.
2
- B.
1
- C.
4
- D.
3
- 8.Atomic weight of nitrogen is 14. It means that
- A.
It is 14 times heavier than hydrogen atom d) None of the above Mass of Nitrogen is 14 gram
- B.
It is 14 times heavier than carbon-12 atom
- C.
It is of is grams
- D.
None of the above
- 9.Name the scientist who gave the atomic theory of matter
- A.
Albert Einstein
- B.
John Dalton
- C.
James Chadwick
- D.
Neils Bohr
- 10.Magnesium and oxygen combine in the ratio of 3:2 by mass to form magnesium oxide. What mass of oxygen gas would be required to react completely with 24 grams of magnesium?
- A.
16 g b) 45 g c) 12 g d) 19 g 16g
- B.
45 g
- C.
12 g
- D.
19 g
- 11.The smallest atom of all is _________.
- A.
C
- B.
H
- C.
Cu
- D.
Na
- 12.The value of Avogadro number is _______________.
- A.
9.022 x 10^23 ( ^ = THESE SYMBOL INDICATES TO THE POWER )
- B.
6.022 X 10^23
- C.
12.44 X 10^23
- D.
3.011 X 10^23
- 13.1 mole = ___________ mass of element.
- A.
Kilogram
- B.
Metre
- C.
Gram atomic
- D.
None of this these
- 14.What is the valency of nitrogen in ammonia (NH3 )
- A.
3
- B.
4
- C.
2
- D.
1
- 15.What is the formula of lithium nitride
- A.
LiN
- B.
(LI2)3 N
- C.
Li2N
- D.
Li3N
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