Problem 157
The normality of \(0.3 \mathrm{M}\) phosphorous acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{3}\right)\) is a. \(0.1\) b. \(0.3\) c. \(0.6\) d. \(0.9\)
Problem 158
An aqueous solution of \(6.3 \mathrm{~g}\) of oxalic acid dihydrate is made upto \(250 \mathrm{~mL}\). The volume of \(0.1 \mathrm{~N} \mathrm{NaOH}\) required to completely neutralizes \(10 \mathrm{~mL}\) of this solution is a. \(40 \mathrm{~mL}\) b. \(20 \mathrm{~mL}\) c. \(10 \mathrm{~mL}\) d. \(4 \mathrm{~mL}\)
Problem 160
How many moles of electrons weigh one kilogram? (mass of electron \(=9.108 \times 10^{-31} \mathrm{~kg}\), Avogadro number \(=6.023 \times 10^{23}\) ) a. \(6.023 \times 10^{23}\) b. \(1 / 9.108 \times 10^{31}\) c. \(\frac{6.023}{9.08} \times 10^{54}\) d. \(\frac{1}{9.108 \times 6.023} \times 10^{9}\)
Problem 161
Which has maximum number of atoms? a. \(24 \mathrm{~g}\) of \(\mathrm{C}(12)\) b. \(56 \mathrm{~g}\) of \(\mathrm{Fe}(56)\) c. \(27 \mathrm{~g}\) of \(\mathrm{Al}(27)\) d. \(108 \mathrm{~g}\) of \(\mathrm{Ag}(108)\)
Problem 162
Mixture \(\mathrm{X}=0.02 \mathrm{~mol}\) of \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}\) and \(\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right), \mathrm{Br}\right] \mathrm{SO}_{4}\) was prepared in 2 litre of solution.1 litre of mixture \(\mathrm{X}+\) excess \(\mathrm{AgNO}_{3} \rightarrow \mathrm{Y}\) I litre of mixture \(\mathrm{X}+\) excess \(\mathrm{BaCl}_{2} \rightarrow \mathrm{Z}\) Number of moles of \(\mathrm{Y}\) and \(\mathrm{Z}\) are a. \(0.02,0.01\) b. \(0.01,0.01\) c. \(0.01,0.02\) d. \(0.02,0.02\)
Problem 163
Consider a titration of potassium dichromate solution with acidified Mohr's salt solution using diphenyl amine as indicator. The number of moles of Mohr's salt required per mole of dichromate isa. 3 b. 4 c. 5 d. 6
