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1
The molecular formula for __________________ is .
ammonium sulphate
ammonium-sulphur
ammonia sulphate
None of these
2
Avogadro number is __________________.
6.022 X 1023
6022 X 1023
602.2 X 1023
60 X 1023
3
We use the term ___________ for those substances, which have their constituent particles as ions.
Formula unit
Unit
Molecular unit
4
The empirical formula of a compound gives the simplest ____________ number ratio of the atoms of the elements present in a molecule of the compound.
Whole
Even
Odd
Prime
5
Free radicals are highly reactive and ____________.
Stable
Unstable
most stable
6
Calculate the percentage by mass of Chlorine in HCl.
90 %
93 %
97 %
99 %
7
The molecular mass of a substance expressed in grams is called the ________ molecular mass of the substance.
Dalton
Gram
amu
8
The empirical formula of benzene is ____________, while that of hydrogen peroxide is HO.
CH
CH2
C2H
OH
9
The molecular mass of is 28, so the gram molecular mass of is _______________.
28 a
28 Da
28 G
28 g
10
Which of the following statement / statements are correct :
(a) Na+ is the radical of Sodium.
(b) H+ is the radical of Helium.
Only (a) is correct.
Only (b) is correct.
Both (a) and (b) are correct.
11
(a) K+ is the radical of Potassium.
(b) NH4+ is the radical of Ammonium.
12
(a) We can only use the symbol of the element to calculate the mass.
(b) We can use the molecular formula to calculate mass.
Only (a) and (b) are correct.
13
Empirical formula of ammonium sulphate is _____________________.
NH3SO4
NH4SO4
(NH4)2SO4
NH4(SO4)2
14
What is the formula unit mass of Hydrochloric acid?
34
35.5
36.5
37
15
Find the number of moles of 48 g of oxygen gas ?
1 mol
1.5 mol
2 mol
2.5 mol