Chemistry Past Questions and Answers

When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are

Which of the following gases is light than air?

Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules

In which of the following compound (s) will heat be absorbed on adding water? l. KNO <sub style='font-size: smaller;'>3</sub><br/>II. Concentrated H<sub style='font-size: smaller;'>2</sub><br/>SO<sub style='font-size: smaller;'>4</sub> III. NH <sub style='font-size: smaller;'>4</sub>CI

Consider the reaction represented by the equation: Ca(OH)<sub style='font-size: smaller;'>2(aq)</sub> + CO <sub style='font-size: smaller;'>2(g)</sub> → CaCO3<sub style='font-size: smaller;'>(s)</sub> + H <sub style='font-size: smaller;'>2</sub>O<sub style='font-size: smaller;'>(l)</sub><br/>in the reaction above, CO <sub style='font-size: smaller;'>2</sub> acts as