Problem 1
The number of significant figures for the three numbers \(193 \mathrm{~cm}, 0.193 \mathrm{~cm}, 0.0193 \mathrm{~cm}\) are: (a) 2,3 and 4 respectively (b) 3,3 and 3 respectively (c) 3,5 and 4 respectively (d) 3,4 and 4 respectively
Problem 2
The equivalent weight of an acid is equal to: (a) Molecular weight/acidity (b) Molecular weight/basicity (c) Molecular weight \(\times\) basicity (d) Molecular weight \(\times\) acidity
Problem 3
Avogadro's number is the number of molecules present in: (a) 1 litre of molecule (b) \(1 \mathrm{~g}\) of molecule (c) Gram molecule mass (d) \(1 \mathrm{~g}\) atom
Problem 4
A mole of any substance is related to: (a) Number of particles (b) Volume of gaseous substances (c) Mass of a substance (d) All of these
Problem 5
\(25 \mathrm{~mL}\) of a solution of barium hydroxide on titration with \(0.1\) molar solution of hydrochloric acid gave a titre value of \(35 \mathrm{~mL}\). The molarity of barium hydroxide solution was: (a) \(0.07\) (b) \(0.14\) (c) \(0.28\) (d) \(0.35\)
Problem 6
Number of atoms in \(560 \mathrm{~g}\) of Fe (atomic mass \(56 \mathrm{~g}\). \(\mathrm{mol}^{-1}\) ) is: (a) Twice that of \(70 \mathrm{~g} \mathrm{~N}\) (b) Half that of \(20 \mathrm{~g} \mathrm{H}\) (c) Both are correct (d) None is correct
Problem 7
The number of oxygen atoms in \(6.4 \mathrm{~g}\) of \(\mathrm{SO}_{2}\) is: (a) \(6 \times 10^{23}\) (b) \(11 \times 10^{23}\) (c) \(12 \times 10^{23}\) (d) \(1.2 \times 10^{23}\)
Problem 8
What volume of hydrogen gas at \(273 \mathrm{~K}\) and 1 atm pressure will be consumed in obtaining \(21.6 \mathrm{~g}\) of elemental boron (atomic mass \(=10.8\) ) from the reduction of boron trichloride by hydrogen? (a) \(89.6 \mathrm{~L}\) (b) \(67.2 \mathrm{~L}\) (c) \(44.8 \mathrm{~L}\) (d) \(22.4 \mathrm{~L}\)
Problem 9
The number of moles of \(\mathrm{KCl}\) in \(1000 \mathrm{~mL}\) of 3 molar solution is: (a) 2 (b) 3 (c) 4 (d) 6
Problem 11
The correct relationship between molecular mass and vapour density is: (a) V.D. \(=2 \mathrm{M}\) (b) V.D. \(=\frac{\mathrm{M}}{2}\) (c) \(\mathrm{M}=(\mathrm{V} . \mathrm{D} .)^{\frac{1}{2}}\) (d) V.D. \(=\mathrm{M}^{2}\)
