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Question 1: In water, hydrogen and oxygen are present in the ratio of ________.
1. 1:8
2. 2:12
3. 2:3
4. 1:2
Answer: 1
Question 2 : An exampe of a triatomi! moe!ue is ___________.
1. "#one
2. $itrogen
3. %ar&on monoxide
4. 'ydrogen
Answer: 1
Question 3: (he )uantity of matter present in an o&*e!t is !aed its _________.
1. +ass
2. oume
3. -ensity
4. apour pressure
Answer: 1
Question 4: Indiisi&iity of an atom was proposed &y ___________.
1. -aton
2. /utherford
3. (homson
4. 0ohr
Answer: 1
Question : (he aue of Aogadro !onstant is ___________.
1. .22 x 124
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2. .22 x 122
3. .22 x 123
4. .22 x 123
Answer: 4
Question : A sampes of !ar&on dioxide !ontain !ar&on and oxygen in the mass
ratio of 3:8. (his is in agreement with the aw of ___________.
1. %onseration of +ass
2. %onstant 5roportion
3. +utipe 5roportion
4. /e!ipro!a 5roportion
Answer: 2
Question 6: (he atomi! mass of sodium is 23. (he num&er of moes in 4g of
sodium is ________.
1. 2
2. 1
3. 4
4.
Answer: 1
Question 8: (he moe!uar formua of potassium nitrate is ________.
1. 7$"
2. 7$"3
3. 7$"2
4. 7"$
Answer: 2
Question : 7aium is the atin name of ________.
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1. 5otassium
2. 7rypton
3. %a!ium
4. 5hosphorus
Answer: 1
Question 1: (he smaest parti!e of a su&stan!e that is !apa&e of independent
existen!e is _________.
1. Atom
2. +oe!ue
3. 9e!tron
4. 5roton
Answer: 2
Question 11:
1. Atomi! num&er
2. Atomi! mass
3. Atomi! mass s!ae
4. $um&er of ee!trons
Answer: 2
Question 12
1. 1.2
2. 1
3. 14
4. 12
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Answer: 2
Question 13: (he moe!uar mass of ammonia is _________.
1. 16 grams
2. 31 grams
3. 2 grams
4. 2 grams
Answer: 1
Question 14: Atomi! mass of !a!ium is 4. (he mass of 2. gram atoms of !a!ium
is _______.
1. 4 g
2. 2. g
3. 1 g
4. 8 g
Answer: 3
Question 1: (he num&er of atoms in a moe!ue of the eementary su&stan!e is
!aed ________.
1. Atomi! num&er
2. Aogadro num&er
3. Atomi! mass
4. Atomi!ity
Answer: 4
Question 1: Aogadro num&er represents the num&er of atoms in ________.
1. 12 grams of 12%
2. 32 grams of suphur
3. 32 grams of oxygen
4. 1 gram of 12%
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Answer: 1
Question 16 : (he num&er of moes in grams of !a!ium is _________.
1. .12 moe
2. moe
3. 1.2 moe
4. 12. moes
Answer: 1
Question 18: 2 moe!ues of nitrogen are represented &y ________.
1. $
2. 2$2
3. $2
4. 2$
Answer: 2
Question 1: "ne moe of '2" !orresponds to
1. 22.4 itre at 1 atm and 2%
2. .2 x 123 atoms of hydrogen and .2 x 123 atoms of oxygen
3. 18 g
4. 1 g
Answer: 3
Question 2: (he num&er of moe!ues in 4.2 g of ammonia is approximatey
1. 1. x 123
2. 1. x 123
3. 2. x 123
4. 3. x 123
Answer: 2
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Question 21: A sampe !ontains 22 g of !ar&on dioxide. (his is e)ua to
1. "ne moar oume of !ar&on dioxide
2. "ne moe of !ar&on dioxide
3. 'af moe of !ar&on dioxide
4. (wo moes of !ar&on dioxide
Answer: 3