CBSE
Multiple Choice QuestionsVapour density of a volatile substance is 4 (CH4 = 1). Its molecular weight would be:
2
8
64
128
A bivalent metal has an equivalent mass of 32. The molecular mass of the metal nitrate is :
182
168
192
188
35.4 mL of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is?
0.97 N
0.142 N
0.194 N
0.244 N
One gram of mass is equal to :
9 x 1020 ergs
7 x 1015 ergs
5 x 1010 ergs
3 x 105 ergs
The value of amu is which of the following?
1.57 10-24 kg
1.66 10-24 kg
1.99 10-23 kg
1.66 10-27 kg
One mole of FeC2O4 is oxidised by x moles of Cr2 in acidic medium , x is:
0.5
1.0
1.5
2.0
75 c.c. of N/5 H2SO4, 10 c.c. of N/2 HCl and 30 c.c. of N/10 HNO3 are mixed together. The strength of the resulting acid mixture is:
0.1N
0.2N
0.3N
0.4N
20 mL of 0.5 N HCl and 35 mL of 0.1 N NaOH are mixed. The resulting solution will :
be neutral
be basic
turn phenolphthalein solution pink
turn methyl orange red
Arrange the following (I to IV) in the order of increasing masses:
I. 0.5 mole of O3
II. 0.5 g atom of oxygen
III. 3.011 x 1023 mlecules of O2
IV. 5.6 l of CO2 at STP
II < IV < III < I
IV < III < I < II
II < I < IV < III
I < II < III < IV
Forty millilitre of CO was mixed 100 mL of O2 and the mixture was exploded. On cooling, the reaction mixture was shaken with KOH. What volume of gas is left?
80 ml of O2
60 ml of O2
80 ml of CO2
50 ml of CO2
