1) Avogadro's number is ?
a) 1.602*10-19
(b) 3.0*108
(c )96500
(d) 6.022*1023
2) Which of the following methods of expressing concentration are independent of temperature?
a) Molarity
b) Molality
c) Normality
d) Mole fraction
3) Which of the following is not a homogeneous mixture ?
a) Air
b) Brass
c) Solution of sugar in water
d) Smoke
4) Molar volume of any gas at STP is equal to :
a) 22.4 L
b) 25.8 L
c) 6.022 L
d) 96500L
5) Which of the following is the standard for atomic mass?
a) C-12
b) O-16
c) H-1
d) Cl-35.5
7) Brass is an alloy of :
a) Sn and Zn
b) Zn and Pb
c) Cu and Zn
d) C and Fe
6)Which of the following is not an element ?
1)Diamond
2) Ozone
3) Graphite
4) Silica
7) A pure substance can only be :
1) compound
2) element
3) alloy
4) element and compound
8) A pure substance which consists of only one kind of atoms is called :
1) compound
2) element
3) solid
4) liquid
9)The equivalent weight of iron in Fe2O3 is :
1) 56
2) 36
3) 28
4) 18.66
10) The number of significant figures in 0.050 is :
1) 4
2) 1
3) 2
4) 3
11) Which out of the following is not a homogeneous mixture?
1) Brass
2) Bronze
3) Solution of salt in water
4) smoke
13) A compound has the empirical formula C2H3O2 .Its vapor density is 59.find molecular formula
1) C2H3O2
2) C6H9O6
3) C4H6O4
4) C8H12O8
14) The number of molecules present in 8 gram of oxygen ?
1) 3.011 * 1023
2) 6.022 * 1023
3) 1.51 * 1023
4) 12.044 * 1023
15) 112 cm3 of hydrogen gas at STP contain :
2) 0.02 g
2) 0.005 g
3) 0.005 mol
4) 6.022 * 1023 atoms
16) 27 gram aluminium will react with oxygen equal to :
1) 8 g
2) 24 g
3) 40g
4) 10 g
17) Which has maximum number of atoms?
1) 24 g C
2) 56 g Fe
3) 27 g Al
4) 108 g Ag
18) Weight of one equivalent of sulfuric acid is equal to :
1) 25 g
2) 50 g
3) 49g
4) 98 g
19) Mass of CO2 which contains equal number of molecules as present in 40 g O2 :
1) 25g
2) 58 g
3) 55g
4) 16 g
20) Which one of the following is not a mixture?
1) Brass
2) Air
3) 22 carat gold
4) water
21) If 48 gram oxygen combines with Al to form Al2O3 ,what mass of Al is used in the reaction
1) 2.7g
2) 54 g
3) 81 g
4) 40.5 g
One word or one liner answer questions
1) Size of solute particles in true solutions is :
2) What is the SI unit of amount of the substance ?
3) What is the actual mass of one amu ?
4) What is the actual mass of one atom of carbon-12
5) The Loschimdt number is equal to :
6) The smallest particle that takes part in chemical reactions is
7) what is the PH of neutral water
8) 52 mol of He weighs ?
9) how many molecules are there in 48 gram of water?
10) The chemical formula of common salt,sucrose,glucose is
11) Graphite is ………………… of electricity
12) how many significant figures are there in 0.0101
13) which of the following is a compound ?
14) What is molar mass ?
15) What is molar volume
16) What is mole
17) What is Avogadro number
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