Multiple Choice QuestionsSodium nitrate on reduction with Zn in presence of NaOH solution produces NH3. Mass of sodium nitrate absorbing 1 mole of electron will be
7.750
10.625
8.000
9.875
In transforming 0.01 mole of PbS to PbSO4, the volume of '10 volume' H2O2 required will be
11.2 mL
22.4 mL
33.6 mL
44.8 mL
D.
44.8 mL
From the equation given below,
PbS + 4H2O2 → PbSO4 + 4H2O
1 mole of PbS requires 4 moles of H2O2.
0.01 moles of PbS requires 0.04 mole of H2O2.
Now,
Weight of 0.04 mole H2O2 = 1.36 gm
And, 10 volume of H2O2 means,
1 mL of such solution of H2O2 on decomposition by heat produces 10 mL of oxygen at NTP.
H2O2 decomposes itself as,
2H2O2 → 2H2O + O2
Thus, 1 mL of 10 volume of H2O2 solution contains
= × 10 gm of H2O2 = 0.03035 gm H2O2
0.03035 gm of H2O2 is present in 1 mL of 10 volume of H2O2
1.36 gm of H2O2 present in × 1.36 mL of 10 volume of H2O2
= 44.81 mL
An unknown element forms an oxide.What will be the equivalent weight of the element if the oxygen content is 20% by weight?
16
32
8
64
2 N HCl solution will have same molar concentration as a
4.0 N H2SO4
0.5 N H2SO4
1 N H2SO4
2 N H2SO4
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
Which of the following has the smallest number of molecules ?
0.1 mole of CO2 gas
11.2 L of CO2 gas at STP
22 g of CO2 gas
22.4 x 103 mL of CO2 gas at STP
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
4.6 x 1022 atoms of an element weigh 13.8g. The atomic weight of that element is
290
180
34.4
10.4
2g of mixture of CO and CO2 on reaction with excess I2O5 produced 2.54g of I2. What would be the mass% of CO2 in the original mixture?
60
30
70
35
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