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1.

White substance dissolves in hot water. A black precipitate appears on passing `H_(2)S` gas in its aqueous solution. The black precipitate dissolves in hot `HNO_(3)`. A white precipitate is obtained on adding concentrated `H_(2)SO_(4)` in its solution. This white precipitate is ofA. `BaSO_(4)`B. `SrSO_(4)`C. `PbSO_(4)`D. `CdSO_(4)`

Answer» Correct Answer - C
Discussion
2.

A mixture is known to contain `NO_(3)^(-)` and `NO_(2)^(-)` before performing ring test for `NO_(3)^(-)`. The aq. Solution should be made free of `NO_(2)^(-)`. This is done by heating withA. `NH_(4)Cl`B. `Zn` dustC. Conc. `HNO_(3)`D. dil. `HNO_(3)`

Answer» Correct Answer - A
Discussion
3.

When `H_(2)S` gas a passed through an ammonical salt solution X, a slightly white precipitate is formed. The X can be:A. Cobalt saltB. Nickel saltC. Manganese saltD. Zinc salt

Answer» Correct Answer - D
Discussion
4.

`FeCl_(3)` is acidic towards litmus. On treatment with excess of `NH_(4)SCN` it gives red coloured compound (A) and on treatment with excess of `K_(2)Cr_(2)O_(7)` in the presence of conc. `H_(2)SO_(4)`, it evolves deep red vapours of (B) on passing the vapours of (B) into `NaOH`, then adding a solution of acetic acid and lead acetate it gives yellow ppt. of compound of chromium (C) The compound A isA. `Fe(SCN)_(2)`B. `Fe(SCN)_(3)`C. `FeCl_(3)`D. `NH_(4)[Fe(CN)_(4)]`

Answer» Correct Answer - B
Discussion
5.

If `Pb[CH_(3)COO]_(2)` and `Na_(2)S` are mixed and dissolved in water and the solution is filtered then the filterate will give test ofA. `Pb^(+2)`B. `CH_(3)COO^(-)`C. `S^(-2)`D. `Na^(+)`

Answer» Correct Answer - B::D
Discussion
6.

A certain compound (A) is used in the laboratory for analysis, its aqueous solution gives the following reactions: a. On addition to copper sulphate, a brown precipitate is obtained which turns white on addition of excess of the `Na_(2)S_(2)O_(3)` solution. b. On addition to the `Ag^(o+)` ion solution, a yellow curdy precipitate is obtained which is insoluble in ammonium hydroxide. Identify (A) and give equations for the reactions at steps (a) and (b).

Answer» Yellow curdy ppt. with `Ag^(+)` confirms the presence of `l^(-)` ion in the compound. The precipitate is insoluble in `NH_(4)OH.`
`[Ah^(+)+l^(-)] rarrAgl].`
The compound (X) gives brown ppt. with `CuSO_(4)` which becomes white when `Na_(2)S_(2)O_(3)` is added. Thus compound X should be Kl.
The reactions :
`CuSO_(4)+2Kl rarr Cul_(2)+K_(2)SO_(4)`
`2Cul_(2) rarr underset("Brown")(Cu_(2)l_(2))+l_(2)`
`2Na_(2)S_(2)O_(3)+l_(2) rarr underset("thionate (white)")underset("Sodium tetra")(Na_(2)S_(4)O_(6))+2Nal`
Discussion
7.

The only cations present in a slightly acidic solution are `Fe^(3+),Zn^(2+)` and `Cu^(2+)` . The regent that when added in excess to this solution would identify and separate `Fe^(3+)` in one step isA. 2 M HClB. 6 M `NH_(3)`C. 6 M NaOHD. `H_(2)S` gas

Answer» Correct Answer - B
Discussion
8.

A solution containing `Na_(2)S` is treated with and `Fe^(+3)` then which type of colour will appear?

Answer» Correct Answer - Blue
Discussion
9.

STATEMENT - 1 : `Fe^(+3)` gives brown coloured ppt with `K_(3)[FeCN)_(6)].` and STATEMENT - 2 : Formation of undissociated complex `Fe[Fe(CN)_(6)]` take place.A. Statement-1 is True, Statement-2, is True, Statement-2 is a correct explanation for Statement-8B. Statement-1 is True, Statement-2, is True, Statement-2 is NOT a correct explanation for Statement-8C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True

Answer» Correct Answer - B
Discussion
10.

Match the Following : `{:(" Column I"," Column II"),("(A) Borax "overset(Delta)rarr.,"(p) Inorganic benzene"),("(B) Borax "+NH_(4)Cloverset(Delta)rarr,"(q) "NaBO_(2)+B_(2)O_(3)),("(C) Borax "+NH_(3)overset(Delta)rarr,"(r) "(BN)_(x)),("(D) Borax "+H_(2)Orarr,"(s) "H_(3)BO_(3)):}`

Answer» Correct Answer - A(q), B(r), C(p, r), D(s)
Discussion
11.

A metal ion give chocolate coloured ppt with `K_(4)[Fe(CN)_(6)]` What is the oxidation state of that metal in its ion ?

Answer» Correct Answer - 2
Discussion
12.

STATEMENT - 1 : `Cu^(+2)` is unstable in presence of `Cl^(-)` ion. and STATEMENT - 2 : Formation of `CuCl` is more favourable.A. Statement-1 is True, Statement-2, is True, Statement-2 is a correct explanation for Statement-9B. Statement-1 is True, Statement-2, is True, Statement-2 is NOT a correct explanation for Statement-9C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True

Answer» Correct Answer - B
Discussion
13.

STATEMENT - 1 : `Co^(2+)` gives green colour with `Br_(2)` water in presence of `KHCO_(3)` and STATEMENT - 2 : Green colour is due to formation of `CoCO_(3)`.A. Statement-1 is True, Statement-2, is True, Statement-2 is a correct explanation for Statement-5B. Statement-1 is True, Statement-2, is True, Statement-2 is NOT a correct explanation for Statement-5C. Statement-1 is True, Statement-2 is FalseD. Statement-1 is False, Statement-2 is True

Answer» Correct Answer - C
Discussion
14.

Borax `[Na_(2)B_(4)O_(7).10H_(2)O]` when heated on platinum loop it gives a dark transparent glass like bead. The hot bead is dipped in the salt till it reacts with transition metal oxide. It produces characteristic bead of meta borate. `{:(" Colour of the bead"," lon"),("(a) Blue green or light blue",Cu^(+2)),("(b) Yellow",Fe^(+2)or Fe^(+3)),("(c) Green",Cr^(+3)),("(d) Violet",Mn^(+2)),("(e) Dark blue",Co^(+2)),("(f) Brown",Ni^(+2)):}` The colour of bead `Ni(BO_(2))_(2)` isA. GreenB. BrownC. VioletD. Blue

Answer» Correct Answer - B
Discussion