WorksheetsSome basic concepts of chemistry
Total questions: 30
Worksheet time: 19mins
The reactant which is entirely consumed when a reaction goes to completion is called
(a)
How many atoms of magnesium are present in 96u of Magnesium
0.25
25
4
0.4
The volume of 1.7g of NH3 at STP (273K, 1atm) is
1.7L
2.24L
2.8L
3.4L
Number of moles present in 22.0g of carbondioxide is
2
22
0.5
0.25
The reactant which is entirely consumed when a reaction goes to completion is called
(a)
(a) refers to the agreement of a particular value to the true value of the result.
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
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
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
A jug contains 2 L of milk. The volume of milk in m3 is:
0.02
2
0.002
0.0002
Number of significant figures in
12.6 X 11.2
are:
6
3
4
2
Gram molecule of sugar in 547.2 gram are:
(Mol. mass of sugar = 342)
1.6
2.2
342
548
The number of moles of iodine in a sample containing 1.0 × 1022 molecules are:
6.022 X 1023 Moles
0.0166 Moles
3 moles
None of the above
The weight of carbon monoxide having same number of oxygen atoms as are present in 88 g of carbon dioxide are:
44 g
112 g
12 g
32 g
The amount of KClO3 needed to supply sufficient oxygen for burning 112 L of CO gas at N.T.P is___________.
9.859 g
6.023 g
308.25 g
204.16 g
50.0 kg of N2 (g) and 10.0 kg of H2 (g) are mixed to produce NH3 (g). The limiting reagent in this reaction is:
H2
H
N2
N
The molality of a solution containing 20.7 g of potassium carbonate dissolved in 500 mL of solution:
(assume density of solution =1 g mL–1).
3.13 m
0.313 m
31.3 m
None of the above
250 mL of 1.5 M solution of sulphuric acid is diluted by adding 5L of water. The molarity of the diluted solution is:
0.0926
0.0823
0.0714
12
Name the property among the following that is affected by change in temperature
Molarity
Molality
None of these are correct
Formality
How many atoms are present in 46 u of Na
46
23
1
2
What is the unit of mole fraction
gram
Mole
Mol/L
Unitless
Quantity of carbon dioxide produced by reaction of 48g of Carbon and 1 mol of dioxygen is___________
22g
11g
44g
24g
Equal moles of the substance are present in
1.6 g CH4
1.7 g NH3
1.8 g H2O
1.2 g Mg
Na2SO3.xH2O has 50% H2O by mass. Hence x is
4
5
6
7
Calculate the % composition by mass of oxygen present in H2SO4.
16.3%
65.25%
32.6%
57.14%
An Avogadro's number of water molecules is equal to all EXCEPT _________.
1 mole of water molecules
2 moles of Hydrogen atoms and 1 mole of oxygen atoms
18 grams of water
18 molecules of water
If the density of a solution is 4.5g/mL, the mass of 1.4mL solution in significant figure is
3.21g
4.5g
0.63g
6.3g
