Problem 34
Which of the following pairs contain equal number of atoms? (1) \(11.2 \mathrm{cc}\) of the \(\mathrm{N}_{2}\) and \(0.015 \mathrm{~g}\) of nitric oxide (2) \(22.4\) litres of nitrous oxide and \(22.4\) litres of nitric oxide (3) 1 milli mole of \(\mathrm{HCl}\) and and \(0.5\) milli mole of \(\mathrm{H}_{2} \mathrm{~S}\) (4) 1 mole of \(\mathrm{H}_{2} \mathrm{O}_{2}\) and 1 mole of \(\mathrm{N}_{2} \mathrm{O}_{4}\)
Problem 41
Which of the following is wrong? (1) One mole of hydrogen weighs less than one mole of glucose (2) Two moles of hydrogen and one mole of helium weigh the same (3) \(0.1\) mole of oxygen weighs more than one mole of hydrogen (4) One mole of nitrogen and half a mole of oxygen weigh the same
Problem 42
Avogadro s law finds application in the determination of (1) Atomicity of gases (2) Molecular weight of gases (3) Molecular formula of certain gaseous compounds (4) All the above
Problem 44
Molecular weight of haemoglobin is \(67200 .\) ]f haemoglobin contains \(0.33 \%\) of iron atoms, the number of iron atoms that are present in one molecule of haemoglobin is (At. wt. of iron \(=56\) ) (1) 2 (2) 4 (3) 6 (4) 8
Problem 45
How many moles of atoms are present in onc mole of \(\mathrm{CII}_{3} \mathrm{COOII}\) molecule? (1) 2 moles of \(\mathrm{C}\) atoms, 4 moles of \(\mathrm{H}\) atoms, 2 moles of \(\mathrm{O}\) atoms (2) 1 mole of \(C\) atoms, 2 moles of \(\mathrm{H}\) atoms, 1 mole of \(\mathrm{O}\) atoms (3) 2 moles of \(\mathrm{C}\) atoms, 3 moles of \(\mathrm{H}\) atoms, 2 moles of \(O\) atoms (4) None
Problem 46
Which contains the greatest number of oxygen atoms? (1) \(1 \mathrm{~g}\) of \(\mathrm{O}_{2}\) (2) \(1 \mathrm{~g}\) of \(\mathrm{O}_{2}\) (3) \(1 \mathrm{~g}\) of \(\mathrm{O}_{3}\) (4) All have the same number of atoms
Problem 49
Weight of \(6.023 \times 10^{21}\) atoms of zinc (At. wt. of \(\mathrm{Zn}=\) \(65.4)\) is (1) \(0.645 \mathrm{~g}\) (2) \(0.0654 \mathrm{~g}\) (3) \(6.54 \mathrm{~g}\) (4) \(0.00654 \mathrm{~g}\)
Problem 51
Two containers have equal weights of \(\mathrm{NO}_{2}\) and \(\mathrm{N}_{2} \mathrm{O} .\) The one containing more number of moles is (I) \(\mathrm{NO}_{2}\) (2) \(\mathrm{N}_{2} \mathrm{O}\) (3) both have same number of moles (4) cannot be determined
Problem 52
Which of the following mixtures contain less number of ions? (1) \(2 \mathrm{M} \mathrm{K}_{2} \mathrm{SO}_{4} ; 3 \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3}\) (2) \(2 \mathrm{M} \mathrm{NaC} 1 ; 2 \mathrm{M} \mathrm{KC} 1\) (3) \(2 \mathrm{M} \mathrm{MnSO}_{4} ; 2 \mathrm{M} \mathrm{K}_{2} \mathrm{SO}_{4}\) (4) \(2 \mathrm{M} \mathrm{K}_{2} \mathrm{SO}_{4} ; 2 \mathrm{M}\left(\mathrm{NII}_{4}\right)_{2} \mathrm{SO}_{4}\)
Problem 53
Caffeine (molecular weight \(=194\) ) contains \(28.9 \%\) nitrogen. The number of nitrogen atoms in caffeine molecule is (1) 2 (2) 4 (3) 7 (4) 8
