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WorksheetsSome basic concepts of chemistry
Total questions: 10
Worksheet time: 10mins
Which of the following statement is INCORRECT
protium has no neutron
C14 is used for finding age of old wooden objects
Ca-40 and Ar-50 are isotopes
Ca-40 and Ar -40 are isobars
What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per
500 mL?
4
20
0.2
2
The number of atoms present in one mole of an element is equal to Avogadro
number. Which of the following element contains the greatest number of
atoms?
4g He
46g Na
0.4g Ca
12g He
What is the mass percent of carbon in carbon dioxide?
40
27
32
10
The empirical formula and molecular mass of a compound are CH2O and
180 g respectively. What will be the molecular formula of the compound?
C2H4O2
HCHO
C6H12O6
CH3COOH
Which of the following reactions is not correct according to the law of
conservation of mass.
(i)
(ii)
(iii)
(iv)
2Mg(s) + O2(g) --> 2MgO(s)
C3H8(g) + O2(g) -->CO2(g) + H2O(g)
P4(s) + 5O2(g)--> P4O10(s)
CH4(g) + 2O2(g) --> CO2(g) + 2H2O (g)
For aq sol, which is true
1m=1M
1m is less concentrated than 1M
1m is more concentrated than 1M
Data insufficient
Which is used to Express amount of mercury vapour in atmosphere
M
m
Mole fraction
ppm
What vol of air is needed for complete combustion of 32g methane
2*22.4l
4*22.4l
20*22.4l
22.4l
If 20 litre nitrogen gas reacts with 30 litre hydrogen gas to give ammonia, the volume of product formed is
40
20
50
30
