Problem 17
The weight of a single atom of oxygen is a. \(5.057 \times 10^{23} \mathrm{~g}\) b. \(1.556 \times 10^{25} \mathrm{~g}\) c. \(2.656 \times 10^{-25} \mathrm{~g}\) d. \(4.538 \times 10^{-23} \mathrm{~g}\)
Problem 18
In the reaction \(4 \mathrm{NH}_{3}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\) when 1 mole of ammonia and 1 mole of \(\mathrm{O}_{2}\) are made to react to completion a. \(1.0\) mole of \(\mathrm{H}_{2} \mathrm{O}\) is produced b. \(1.0\) mole of \(\mathrm{NO}\) will be produced c. all the oxygen will be consumed d. all the ammonia will be consumed
Problem 19
The equivalent weight of phosphoric acid \(\left(\mathrm{H}_{3} \mathrm{PO}_{4}\right)\) in the reaction: \(\mathrm{NaOH}+\mathrm{H}_{3} \mathrm{PO}_{4} \rightarrow \mathrm{NaH}_{2} \mathrm{PO}_{4}+\mathrm{H}_{2} \mathrm{O}\) is a. 89 b. 98 c. 59 d. 29
Problem 20
Assuming fully decomposed, the volume of \(\mathrm{CO}_{2}\) released at STP on heating \(9.85 \mathrm{~g}\) of \(\mathrm{BaCO}_{3}\) (atomic mass, \(\mathrm{Ba}=137\) ) will be a. \(2.241\) b. \(4.961\) c. \(1.121\) d. \(0.841\)
Problem 21
Assuming fully decomposed, the volume of \(\mathrm{CO}_{2}\) released at STP on heating \(9.85 \mathrm{~g}\) of \(\mathrm{BaCO}_{3}\) (atomic mass, \(\mathrm{Ba}=137\) ) will be a. \(2.241\) b. \(4.961\) c. \(1.121\) d. \(0.841\)
Problem 22
Percentage of Se in peroxidase anhydrase enzyme is \(0.5 \%\) by weight (at. wt. \(=78.4\) ) then minimum molecular weight of peroxidase anhydrase enzyme is a. \(1.568 \times 10^{3}\) b. \(15.68\) c. \(2.136 \times 10^{4}\) d. \(1.568 \times 10^{4}\)
Problem 23
What is the volume (in litres) of oxygen at STP required for complete combustion of \(32 \mathrm{~g}\) of \(\mathrm{CH}_{4}\) (mol. wt. of \(\mathrm{CH}_{4}=16\) ) a. \(89.6\) b. \(189.6\) c. \(98.4\) d. \(169.5\)
Problem 24
How many water molecules are there in one drop of water (volume \(0.0018 \mathrm{ml}\) ) at room temperature? a. \(4.86 \times 10^{17}\) b. \(6.023 \times 10^{24}\) c. \(2.584 \times 10^{19}\) d. \(6.023 \times 10^{19}\)
Problem 26
\(3 \mathrm{~g}\) of an oxide of a metal is converted to chloride completely and it yielded \(5 \mathrm{~g}\) of chloride. The equivalent weight of the metal is a. \(3.325\) b. \(13.25\) c. \(23.52\) d. \(33.25\)
Problem 28
\(25 \mathrm{ml}\) 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. \(0.35\)
