Chemistry Past Questions and Answers

What is the maximum volume of \(CO _{2}\) at s.t.p. that can be obtained when dilute hydrochloric acid is added to 10 grams of \(CaCO _{3}\) ? <br/>\([ Ca =40, C =12, O =16]

Sulphur (IV) oxide travels a given distance in \(10 sec\). How long will it take equal volume of helium to travel the same distance under the same conditions? \([ S =32, O =16, He\) \(=4\) ]

The volume of hydrogen gas produced at S.T.P. when \(100 ml\) of \(2 M\) hydrochloric acid reacts with exeess zine is ____________

During electrolysis, two cells each containing molten \(Al _{2} O _{3}\) and fuse \(CaCl _{2}\) were connected in series. A current of \(15 Amp\) was passed through the cells for a given period of time. At the end of the electrolysis \(9 g\) of calcium was found to have been deposited at the cathode. What mass of aluminum would be deposited in the second cell. [A = \(27, Ca =40]\)

The balanced equation for the reaction of tin(II) salt with potassium heptaoxodichloromate (VI) in an acidic medium can be represented as \(SSn ^{2+}+ fCr _{2} 2 O _{7}^{2-}+ gH ^{+} \rightarrow hSn ^{4+}+ i -\) \(Cr ^{3+}+ jH _{2} O .\) e, \(f , g , i\) and \(j\) respectively