Related InterviewSolutions

• SO2 and CO2 both turn lime water (X) milky, SO2 also turns K2Cr2O7 /H+ (Y) green while O2 is soluble in pyrogallol (Z) turning it black. These gases are to be detected in order by using these reagents. The order is: (A) (X), (Y), (Z) (B) (Y), (Z), (X) (C) (Y), (X), (Z) (D) (X), (Z), (Y)
• Some white colourless crystals are heated. A cracking sound is heard and brown fumes are given off and the residue left is yellow-brown in colour. When a glowing splinter is held in the fumes, it is relighted. The fumes consist of : (A) O2 (B) NO2 (C) Cl2 (D) NO2 and O2
• A mixture of two colourless substance was dissolved in water. When gaseous Cl2 was passed through the solution, containing small quantity of CCl4 a violet colour developed in organic layer. Addition of BaCl2 to the original solution give a white precipitate. The mixture contains : (A) NaNO3 and AlCl3 (B) NaBr and KCl (C) MgI2 and MgSO4 (D) BaSO4 and PbCl2
• An aqueous solution of salt containing an acidic radical X – reacts with sodium hypochlorite in neutral medium. The gas evolved produces blue black colour spot on the starch paper. The anion X – is : (A) CH3COO – (B) Br – (C) I – (D) NO2– 
• To increase significantly the concentration of free Zn2+ ion in a solution of the complex ion [Zn(NH3)4] 2+ Zn2+ (aq) + 4NH3 (aq)  ⇄ [Zn(NH3)4 ] 2+ (aq) add to the solution some : (A) H2O (B) HCl (aq) (C) NH3 (aq) (D) NH4Cl (aq) 
• White precipitate of AgCl turns to greyish or black when : (A) reacts with Na3AsO4 (B) expossed to sunlight (C) reacts with K2CrO4 (D) reacts with conc.HCl
• Consider the following observation : Mn+ + HCl → white precipitate +   Δ → water soluble. The metal ion Mn+ will be : (A) Hg2+ (B) Ag+ (C) Pb2+ (D) Sn2+ 
• Which of the following statement (s) is/are true ? (A) Ag+ ions do not give white precipitate with concentrated HCl (B) Cu2+ ions produce a white precipitate when KCN solution is added in a small quantity (C) Hg2+ ions give deep blue precipitate with cobalt acetate and ammonium thiocyanate(D) Black precipitate of BiI3 turns orange when heated with water 
• H2S in the presence of HCl precipitates II group but not IV group because (A) HCl activates H2S (B) HCl increases concentration of Cl – (C) HCl decreases concentration of S2– (D) HCl lowers the solubility of H2S in solution
• Cu2+ ions give white precipitate with : (A) excess KI solution (B) potassium thiocyanate solution (C) excess KCN solution (D) potassium hydroxide solution