Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is :

• Both form basic carbonates

• Both form soluble bicarbonates

• Both form nitrides

• Both form nitrides

When BaCl₂ is added to an aqueous salt solution, a white precipitate is obtained. The anion among CO${}_3^{2-}$-, SO${}_3^{2-}$- and SO${}_4^{2-}$ that was present in the solution can be

• CO${}_3^{2-}$ but not any of the other two

• SO${}_3^{2-}$ but not any of the other two

• SO${}_4^{2-}$ but not any of the other two

• Any of them

Match the flame colours of the alkaline earth metal salts in the Bunsen burner.

A. Calcium	p. Brick red
B. Strontium	q. Apple green
C. Barium	r. Crimson

• A - p; B - r; C - q

• A - r; B - p; C - q

• A - q; B ; r; C - p

• A - p; B - q; C - r

Which of the following statement(s) is (are) correct when a mixture of NaCl and K₂Cr₂O₇ is gently warmed with conc. H₂SO₄?

• A deep red vapour is evolved

• The vapour when passed through NaOH solution, gives a yellow solution

• Chlorine gas is also evolved

• Chromyl chloride is formed

Addition of sodium thiosulphate solution to a solution of silver nitrate gives X as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give Y. On boiling in water, Y gives Z. X, Y and Z respectively are

• Ag₂S₂O₃, Na₃[Ag(S₂O₃)₂], Ag₂S

• Ag₂SO₄, Na[Ag(S₂O₃)₂], Ag₂S₂

• Ag₂S₂O₃, Na₅[Ag(S₂O₃)₃], AgS

• Ag₂SO₃, Na₃[Ag(S₂O₃)₂], Ag₂O

Among the following compounds, the one(s) that gives (give) effervescence with aqueous NaHCO₃ solution is (are)

(CH₃CO)₂ O           CH₃COOH         PhOH          CH₃COCHO

   I                           II                   III                 IV

• I and II

• I and III

• Only II

• I and IV

Chlorine gas reacts with red hot calcium oxide to give

• bleaching powder and dichlorine monoxide

• bleaching powder and water

• calcium chloride and chlorine dioxide

• calcium chloride and oxygen

The reaction of nitroprusside anion with sulphide ion gives purple colouration due to the formation of

• the tetranionic complex of iron (II) coordinating to one NOS^- ion

• the dianoinic complex of iron (II) coordinating to one NCS^- ion

• the trianoionic complex of iron (III) coordinating to one NOS^- ion

• the tetranionic complex of iron (III) coordinating to one NCS^- ion

An amorphous solid (X) burns in air to form a gas (Y) which turns lime water milky. This gas decolarises aqueous solution of acidified KMnO₄ gas (Y)reacts with oxygen to give another gas (Z) which is responsible for acid rain. X, Y and Z are

• X	Y	Z
  C	CO	CO2

• X	Y	Z
  S	SO2	SO3

• X	Y	Z
  P	P2O3	P2O5

• X	Y	Z
  S	SO3	H2SO4

A black power when heated with conc. HCl gives a greenish yellow gas. The gas acts as an oxidising and a bleaching agent. When it is passed are slaked lime, a white power is formed which is a ready source of gas. The black powder and white power respectively are

• KClO₃ and NaClO₃

• MnO₂ and CaCOCl₂

• MnO₂ and KClO₃

• MnCl₄ and COCl₂