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1. The blue complex formed on addition of conc. NH4OH solution to a Cu2+ salt solution has the s tructure? (a) [Cu(NH4)4]2+ (b) [Cu(NH3)2]2+ (c) [Cu(NH3)4]2+ (d) [Cu(NH4)2]2+ 2. Sodium thiosulphate is used in photography to (a) Reduce silver bromide to silver (b) Convert metallic silver to silver salt (c) Remove and decompose AgBr as a soluble silver thiosulphate complex (d) Remove reduce silver 3. The black compound formed during the reaction between sodium thiosulphate and silver nitrate is (a) Silver thiosulphate (Ag2S2O3) (b) Silver sulphide (Ag2S) (c) Sliver sulphate (Ag2SO4) (d) Silver sulphite (Ag2SO3) 4. Parke’s process is used (a) To extract Ag using NaCN (b) To extract Cu using CuFeS2 (c) To extract Ag from argentiferrous lead (d) To extract Ag by forming amalgam 5. The lanthanides contraction is responsible for the fact that (a) Zr and Y have about the same radius (b) Zr and Nb have similar oxidation state (c) Zr and Hf have about the same radius (d) Zr and Zn have the same oxidation state 6. Which of the following element is responsible for oxidation of water of O2 in biological process? (a) Fe (b) Mn (c) Cu (d) Mo 7. In order to prepare one litre normal solution of KMNO4, how many grams of KMNO4 are required if the solution is to be used in acidic medium for oxidation? (a) 158 g (b) 62.0 g (c) 31.6 g (d) 790 g 8. The alloy best suited for making metre scales is (a) Stainless steel (b) Invar (c) Alnico (d) Tungsten steel 9. Molecular formula of corrosive sublimate is (b) H (b) Hg2Cl2 (d) HgS (d) HgCl 10. Wrought iron : (a) Pure iron with 0.1 to 0.2% C (b) Pig iron (c) An alloy of steel (d) Impure sulphide ore iron 11. In the manufacture of iron from haematite, limestone is added to act as : (a) Flux (b) Slag (c) A reducing agent (d) An oxidizing agent 12. An extremely hot copper wire reacts with steam to give (a) CuO (b) Cu2O (c) Cu2O2 (d) CuO2 13. Copper displaces which of the metal from their salt solution? (a) AgNO3 (b) ZnSO4 (c) FeSO4 (d) All of these 14. The colour of FeSO4.(NH4)2SO4.6H2O is (a) Red (b) White (c) Blue (d) Green 15. A white solid halide of mercury forms a black mixture NH4OH. The halide is (a) HgCl2 (b) HgCl2 (c) Hg2Cl2 (d) Hg2Cl2 16. Spelter is (a) Impure Cu (b) Impure Zn (c) ZnO (d) CuO 17. 18 carat gold contains (a) 18% Gold (b) 24% Gold (c) 75% Gold (d) 60% Gold 18. Colourless solutions of the following four salts are palced separately in four different test tubes and a strip of copper is dipped in each one these. Which solution will turn blue? (a) KNO3 (b) AgNO3 (c) Zn(NO3)2 (d) ZnSO4 19. Which of the following is used in the preparation of chlorine? (a) Only MnO2 (b) Only KMnO4 (c) Both MnO2 and KMnO4 (d) Either MnO2 or KMnO4

1. The blue complex formed on addition of conc. NH4OH
solution to a Cu2+ salt solution has the s tructure?
(a) [Cu(NH4)4]2+ (b) [Cu(NH3)2]2+
(c) [Cu(NH3)4]2+ (d) [Cu(NH4)2]2+
2. Sodium thiosulphate is used in photography to
(a) Reduce silver bromide to silver
(b) Convert metallic silver to silver salt
(c) Remove and decompose AgBr as a soluble silver
thiosulphate complex
(d) Remove reduce silver
3. The black compound formed during the reaction between
sodium thiosulphate and silver nitrate is
(a) Silver thiosulphate (Ag2S2O3)
(b) Silver sulphide (Ag2S)
(c) Sliver sulphate (Ag2SO4)
(d) Silver sulphite (Ag2SO3)
4. Parke’s process is used
(a) To extract Ag using NaCN
(b) To extract Cu using CuFeS2
(c) To extract Ag from argentiferrous lead
(d) To extract Ag by forming amalgam
5. The lanthanides contraction is responsible for the fact that
(a) Zr and Y have about the same radius
(b) Zr and Nb have similar oxidation state
(c) Zr and Hf have about the same radius
(d) Zr and Zn have the same oxidation state
6. Which of the following element is responsible for oxidation of
water of O2 in biological process?
(a) Fe (b) Mn
(c) Cu (d) Mo
7. In order to prepare one litre normal solution of KMNO4, how
many grams of KMNO4 are required if the solution is to be
used in acidic medium for oxidation?
(a) 158 g (b) 62.0 g
(c) 31.6 g (d) 790 g
8. The alloy best suited for making metre scales is
(a) Stainless steel (b) Invar
(c) Alnico (d) Tungsten steel
9. Molecular formula of corrosive sublimate is
(b) H (b) Hg2Cl2
(d) HgS (d) HgCl
10. Wrought iron :
(a) Pure iron with 0.1 to 0.2% C
(b) Pig iron
(c) An alloy of steel
(d) Impure sulphide ore iron
11. In the manufacture of iron from haematite, limestone is
added to act as :
(a) Flux (b) Slag
(c) A reducing agent (d) An oxidizing agent
12. An extremely hot copper wire reacts with steam to give
(a) CuO (b) Cu2O
(c) Cu2O2 (d) CuO2
13. Copper displaces which of the metal from their salt solution?
(a) AgNO3 (b) ZnSO4
(c) FeSO4 (d) All of these
14. The colour of FeSO4.(NH4)2SO4.6H2O is
(a) Red (b) White
(c) Blue (d) Green
15. A white solid halide of mercury forms a black mixture
NH4OH. The halide is
(a) HgCl2 (b) HgCl2
(c) Hg2Cl2 (d) Hg2Cl2
16. Spelter is
(a) Impure Cu (b) Impure Zn
(c) ZnO (d) CuO
17. 18 carat gold contains
(a) 18% Gold (b) 24% Gold
(c) 75% Gold (d) 60% Gold
18. Colourless solutions of the following four salts are palced
separately in four different test tubes and a strip of copper is
dipped in each one these. Which solution will turn blue?
(a) KNO3 (b) AgNO3
(c) Zn(NO3)2 (d) ZnSO4
19. Which of the following is used in the preparation of chlorine?
(a) Only MnO2 (b) Only KMnO4
(c) Both MnO2 and KMnO4 (d) Either MnO2 or KMnO4

Grade:12

1 Answers

ruchi yadav
askIITians Faculty 27 Points
7 years ago
Answers :

1. b
2. a
3.Silver thiosulphate
4.To extract Ag from argentiferrous lead
5.Zr and Hf have about the same radius
6. Fe
7. 62 gm
8. Steel
9. Hg Cl2
10.Pure iron with 0.1 to 0.2% C
11. c
12. d
13. ZnSO4
14. Green
15. d
16. impure zinc
17. 75% gold
18.a
19. only MnO2


Thank You
Ruchi
Askiitians Faculty

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