In acid medium, Zn reduces nitrate ion to NH ion according to the reaction,
Zn + NO→ Zn2+ + NH + H2O (unbalanced).
How many moles of HCl are required to reduce half a mole of NaNO3 completely ? Assume the availability of sufficient Zn.
5
4
3
2
The relative lowering of vapour pressure of a dilute aqueous solution containing non-volatile solute is 0.0125. The molality of the solution is about
0.70
0.50
0.90
0.80
0.1 mole of a carbohydrate with empirical formula CH2O contains 1 g of hydrogen. What is its molecular formula?
C2H4O2
C5H10O5
C3H6O3
C6H12O6
100 g CaCO3 is treated with 1 L of 1N HCl. What would be the weight of CO2 liberated after the completion of the reaction ?
55 g
11 g
22 g
33 g
What is the volume (in litres) of oxygen required at STP to completely convert 1.5 mol of sulphur into sulphur dioxide?
11.2
22.4
33.6
44.8
The volume of 0.1 M H2SO4 that is needed to completely neutralise 30mL of 0.2 M NaOH solution, is
15mL
30mL
40mL
60mL
The empirical formula of a compound is CH2. One mole of this compound has a mass 42g. Its molecular formula is
C3H6
C2H6
CH2
C2H2
A.
C3H6
Empirical formula mass of CH2 = 12 + 2 = 14
Molecular mass = 42
Then, molecular formula = (empirical formula)
= (CH2)3
= C3H6
What is the volume of "20 volume H2O2" required to get 5000 cm3 of oxygen at STP?
250 cm3
50 cm3
100 cm3
125 cm3
The decomposition of a certain mass of CaCO3 gave 11.2 dm3 of CO2 gas at STP. The mass of KOH required to completely neutralise the gas is :
56 g
28 g
42 g
20 g