91Ó°ÊÓ

Hydrogen sulphide reacts with lead acetate forming a black compound which reacts with \(\mathrm{H}_{2} \mathrm{O}_{2}\) to form another compound. The colour of the compound is (a) Black (b) Yellow (c) White (d) Pink

A metal \(X\) on heating in nitrogen gas gives \(Y . Y\) on treatment with \(\mathrm{H}_{2} \mathrm{O}\) gives a colourless gas which when passed through \(\mathrm{CuSO}_{4}\) solution gives a blue colour. \(Y\) is (a) \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\) (b) \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{MgO}\)

In white phosphorous \(\left(\mathrm{P}_{4}\right)\) molecule which one is not correct? (a) Six P-P single bonds are present (b) Four P- P simie bondis are mesent (c) Four lone pairs of eleciron are presentid) (d) P P P bond angle is 60

\(\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CrO}_{7}\) on heating liberates a gas. The same gas will be obtained by (a) heating \(\mathrm{NH}_{4} \mathrm{NO}_{2}\) (b) heating \(\mathrm{NH}_{4} \mathrm{NO}_{3}\) (c) treating \(\mathrm{Mg}_{3} \mathrm{~N}_{2}\) with \(\mathrm{H}_{2} \mathrm{O}\) (d) heating \(\mathrm{H}_{2} \mathrm{O}_{2}\) on \(\mathrm{NaNO}_{2}\)

Ozone can be detected by using (d) None of these (a) \(\mathrm{Hg}\) (b) \(\mathrm{Ag}\) (c) \(\mathrm{Na}\)

Which oxide reacts with both \(\mathrm{HCl}\) and \(\mathrm{NaOH}\) (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{CaO}\) (c) \(\mathrm{N}_{2} \mathrm{O}_{5}\) (d) \(\mathrm{ZnO}\)

What colour is produced when ammonia is passed through a solution of copper sulphate? (a) red (b) blue (c) orange (d) yellow

\(\mathrm{N}_{2} \mathrm{O}_{3}\) is (a) an acidic oxide and the anhydride of \(\mathrm{HNO}_{2}\) (b) an acidic oxide and the anhydride of \(\mathrm{H}_{2} \mathrm{~N}_{2} \mathrm{O}_{2}\) (c) a neutral oxide and the anhydride of \(\mathrm{HNO}_{3}\) (d) a basic oxide and the anhydride of \(\mathrm{HNO}_{2}\)

The number of \(S-S\) bonds in sulphur trioxide trimer \(\mathrm{S}_{3} \mathrm{O}_{9}\) is (a) Three (b) Two (c) One (d) Zero

Ozone turns benzidine paper (d) Red (a) Violet (b) Brown (c) Blue