Objective Questions – I [Only one correct option]
1. Which of the following dissolves in concentrated NaOH solution? (a) Fe (b) Zn (c) Cu (d) Ag
2. One of the constituent of German silver is (a) Ag (b) Cu (c) Mg (d) Al
3. How many unpaired electrons are present in Ni2+ ? (a) 0 (b) 2 (c) 4 (d) 8
4. Zinc-copper couple that can be used as a reducing agent is obtained by (a) mixing of zinc dust and copper gauge (b) zinc coated with copper (c) copper coated with zinc (d) zinc and copper wires welded together
5. The reaction which proceed in the forward direction is (a) Fe2O3 + 6HCl → 2FeCl3 + 3H2O (b) NH3 + H2O + NaCl → NH4Cl + NaOH (c) SnCl4 + Hg2Cl2 → SnCl2 + 2HgCl2 (d) 2CuI + I2 + 4H+ → 2Cu2+ + 4KI
6. Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is (a) CrO3 (b) Cr2O3 (c) Cr (d) CO
7. Which of the following compounds is expected to be coloured? (a) Ag2SO4 (b) CuF2 (c) MgF2 (d) CuCl
8. In the dichromate dianion (a) 4 Cr – O bonds are equivalent (b) 6 Cr – O bonds are equivalent (c) All Cr – O bonds are equilvalent (d) all Cr – O bonds are nonequivalent.
9. On heating ammonium dichromate, the gas evolved is (a) oxygen (b) ammonia (c) nitrous oxide (d) nitrogen
10. Amongst the following, identify the species with an atom in + 6 oxidation state
(a) MnO–4 (b) 3 6Cr(CN) − (c) NiF62– (d) 22 CrO Cl
11. When MnO2 is fused with KOH, a coloured compound is formed, the product and its colour is (a) K2MnO4, purple green (b) KMnO4, purple (c) Mn2O3, brown (d) Mn3O4, black
12. (NH4)2Cr2O on heating gives a gas which is also given by (a) heating NH4NO2 (b) heating NH4NO3 (c) Mg3N2 + H2O (d) Na(comp.) + H2O2
13. The pair of compounds having metals in their highest oxidation state is (a) MnO2, FeCl2 (b) [MnO4]–, CrO2Cl2 (c) [Fe(CN),6]3–, [Co(CN)3 ] (d) [NiCl4]2–, [CoCl4]–
14. When I– is oxidised by MnO–4 in alkaline medium, Icon errs into (a) 3 IO− (b) I2 (c) 4 IO− (d) IO−
15. Which of the following pair is expected to exhibit same colour in solution? (a) VOCl2; FeCl2 (b) CuCl2; VOCl2 (c) MnCl2; FeCl2 (d) FeCl2; CUCl2
16. Which of the following will not be oxidised by O3? (a) KI (b) FeSO4 (c) KMnO4 (b) K2MnO4
Objective Questions II [One or more than one correct option]
1. Potassium manganate (K2MnO4) is formed when (a) chlorine is passed into aqueous KMnO4 solution (b) manganese dioxide is fused with KOH in air (c) formaldehyde reacts with potassium permanganate in presence of strong alkali (d) potassium permanganate reacts with conc.H2SO4
2. The aqueous solution of the following salts will be coloured in case of (a) Zn(NO3)2 (b) LiNO3 (c) Co(NO3)2 (d) CrCl3
3. Which of the following alloys contains Cu and Zn? (a) Bronze (b) Brass (c) Gun metal (d) Type metal
4. Which of the following statement (s) is/are correct when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4? (a) A deep red vapours in formed (b) Vapours when passed into NaOH solution gives a yellow solution of Na2CrO4 (c) Chlorine gas is evolved (d) Chromyl chloride is formed
5. Which of the following statement (s) is/are correct? (a) The electronic configuration of Cr is [Ar] 3d5 4s1 (Atomic number of Cr = 24) (b) The magnetic quantum number may have a negative value (c) In silver atom, 23 electrons have a spin of one type and 24 of the opposite type (Atomic number of Ag = 47) (d) The oxidation state of nitrogen in HN3 is – 3
6. Reduction of the metal centre in aqueous permanganate ion involves (a) three electrons in neutral medium (b) five electrons in neutral medium (c) three electrons in alkaline medium (d) five electrons in acidic medium
Assertion and Reason
Read the following questions and answer as per the direction given below :
(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.(c) Statement I is true; Statement II is false.
(d) Statement I is false; Statement II is true. 1.
Statement I : To a solution of potassium chromate if a strong acid is added, it changes its colour from yellow to orange.
Statement II : The colour change is due to the change in oxidation state of potassium chromate.
2. Statement I : Zn2+ is diamagnetic. Statement II : The electrons are lost from 4s orbital to form Zn2+.
Fill in the Blanks
1. Mn2+ can be oxidized to MnO–4 by …….(SnO2, PbO2, BaO)
2. The salts …….. and …….. are isostructural. (FeSO4.7H2O, CuSO4.5H2O,MnSO4 .4H2O, ZnSO4.7H2O)
3. Fehling's solution A consists of an aqueous solution of copper sulphate while Fehling's solution B consists of an alkaline solution of …..
4. The outermost electronic configuration of Cr is ……
5. The compound YBa2CU3O7 which show super conductivity has copper in oxidation state …… assuming that the rare earth element Yttrium in its usual +3 oxidation state.
True/False
1. Copper metal reduces Fe2+, in an acid medium.
2. Dipositive zinc exhibit paramagnetism due to loss of two electrons from 3d orbitals of neutral atom.
Subjective
Questions 1.
Complete and balance the following reactions (i) Zn + NO3– → Zn2+ + NH4+
(ii) Cr2 23 2 7 2 2 242 Cr O C H O C H O Cr −+ + → +
2. State the conditions under which the following preparations are carried out. Give necessary equations which need not be balanced. "Potassium permanganate from manganese dioxide"
3. Show with balanced equations for the reactions when (i) Potassium permanganate interacts with manganese dioxide in presence of potassium hydroxide. (ii) Potassium ferricyanide is heated with concentrated sulphuric acid.
4. Give reason in one or two sentences "Most transition metal compounds are coloured."
5. Complete and balance the following reactions (i) Mn2+ PbO2 → MnO4 + H2O (ii) Ag+ + AsH3 → H3ASO3 + H+
6. Write the balanced chemical equations for the following reactions (i) A mixture of potassium dichromate and sodium chloride is heated with concentrated H2SO4. (ii) Potassium permanganate is added to a hot solution of manganous sulphate.
7. Complete and balance the following reaction 4 2 2 8 2 4 (NH ) S O H O MnSO ...... ...... ..... + + → + + 8. Complete and balance the following reactions (i) [NInO4]2– + H+ → ….+ [MnO4]– + H2O (ii) SO2(aq) + Cr2 O72– + 2H+ → …. + ….+ 9. Write balanced equations for the following : (i) Oxidation of hydrogen peroxide with potassium permanganate in acidic medium.
(ii) Reaction of zinc with dilute nitric acid.
10. A compound of vanadium has a magnetic moment of 1.73 13M. Work out the electronic configuration of the vanadium ion of the compound.
11. Give reasons : CrO3 is an acid anhydride.
12. Moist air Zn 4 white furnes (Purple colour) (M Transition with pungent smell element colourless)
(B) MCl (A) = ← → Identify the metal M and hence MC
l4. Explain the difference in colours of MCl4 and A.
Answers 1. (b) 2.(b) 3. (b) 4. (b) 5. (a) 6. (b) 7. (b) 8. (b) 9.(d) 10. (d) 11. (a) 12. (a) 13. (b) 14. (a) 15.(b) 16.(c)
Objective Questions
11 1. (b,c) 2. (c,d) 3. (a,b,c) 4. (a,b,c,d) 5. (a,b,c) 6. (a,c,d)
Assertion and Reason
1. (c) 2. (b)
Fill in the Blanks
1. PbO 2. FeSO4.7HO and ZnSO4.7H2O 3. Rochelle salt 4. 3d5 4s1 5. 7 x 3 = +
True / False
1. F 2. F
1. Which of the following dissolves in concentrated NaOH solution? (a) Fe (b) Zn (c) Cu (d) Ag
2. One of the constituent of German silver is (a) Ag (b) Cu (c) Mg (d) Al
3. How many unpaired electrons are present in Ni2+ ? (a) 0 (b) 2 (c) 4 (d) 8
4. Zinc-copper couple that can be used as a reducing agent is obtained by (a) mixing of zinc dust and copper gauge (b) zinc coated with copper (c) copper coated with zinc (d) zinc and copper wires welded together
5. The reaction which proceed in the forward direction is (a) Fe2O3 + 6HCl → 2FeCl3 + 3H2O (b) NH3 + H2O + NaCl → NH4Cl + NaOH (c) SnCl4 + Hg2Cl2 → SnCl2 + 2HgCl2 (d) 2CuI + I2 + 4H+ → 2Cu2+ + 4KI
6. Ammonium dichromate is used in some fireworks. The green coloured powder blown in the air is (a) CrO3 (b) Cr2O3 (c) Cr (d) CO
7. Which of the following compounds is expected to be coloured? (a) Ag2SO4 (b) CuF2 (c) MgF2 (d) CuCl
8. In the dichromate dianion (a) 4 Cr – O bonds are equivalent (b) 6 Cr – O bonds are equivalent (c) All Cr – O bonds are equilvalent (d) all Cr – O bonds are nonequivalent.
9. On heating ammonium dichromate, the gas evolved is (a) oxygen (b) ammonia (c) nitrous oxide (d) nitrogen
10. Amongst the following, identify the species with an atom in + 6 oxidation state
(a) MnO–4 (b) 3 6Cr(CN) − (c) NiF62– (d) 22 CrO Cl
11. When MnO2 is fused with KOH, a coloured compound is formed, the product and its colour is (a) K2MnO4, purple green (b) KMnO4, purple (c) Mn2O3, brown (d) Mn3O4, black
12. (NH4)2Cr2O on heating gives a gas which is also given by (a) heating NH4NO2 (b) heating NH4NO3 (c) Mg3N2 + H2O (d) Na(comp.) + H2O2
13. The pair of compounds having metals in their highest oxidation state is (a) MnO2, FeCl2 (b) [MnO4]–, CrO2Cl2 (c) [Fe(CN),6]3–, [Co(CN)3 ] (d) [NiCl4]2–, [CoCl4]–
14. When I– is oxidised by MnO–4 in alkaline medium, Icon errs into (a) 3 IO− (b) I2 (c) 4 IO− (d) IO−
15. Which of the following pair is expected to exhibit same colour in solution? (a) VOCl2; FeCl2 (b) CuCl2; VOCl2 (c) MnCl2; FeCl2 (d) FeCl2; CUCl2
16. Which of the following will not be oxidised by O3? (a) KI (b) FeSO4 (c) KMnO4 (b) K2MnO4
Objective Questions II [One or more than one correct option]
1. Potassium manganate (K2MnO4) is formed when (a) chlorine is passed into aqueous KMnO4 solution (b) manganese dioxide is fused with KOH in air (c) formaldehyde reacts with potassium permanganate in presence of strong alkali (d) potassium permanganate reacts with conc.H2SO4
2. The aqueous solution of the following salts will be coloured in case of (a) Zn(NO3)2 (b) LiNO3 (c) Co(NO3)2 (d) CrCl3
3. Which of the following alloys contains Cu and Zn? (a) Bronze (b) Brass (c) Gun metal (d) Type metal
4. Which of the following statement (s) is/are correct when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4? (a) A deep red vapours in formed (b) Vapours when passed into NaOH solution gives a yellow solution of Na2CrO4 (c) Chlorine gas is evolved (d) Chromyl chloride is formed
5. Which of the following statement (s) is/are correct? (a) The electronic configuration of Cr is [Ar] 3d5 4s1 (Atomic number of Cr = 24) (b) The magnetic quantum number may have a negative value (c) In silver atom, 23 electrons have a spin of one type and 24 of the opposite type (Atomic number of Ag = 47) (d) The oxidation state of nitrogen in HN3 is – 3
6. Reduction of the metal centre in aqueous permanganate ion involves (a) three electrons in neutral medium (b) five electrons in neutral medium (c) three electrons in alkaline medium (d) five electrons in acidic medium
Assertion and Reason
Read the following questions and answer as per the direction given below :
(a) Statement I is true; Statement II is true; Statement II is the correct explanation of Statement I.
(b) Statement I is true; Statement II is true; Statement II is not the correct explanation of Statement I.(c) Statement I is true; Statement II is false.
(d) Statement I is false; Statement II is true. 1.
Statement I : To a solution of potassium chromate if a strong acid is added, it changes its colour from yellow to orange.
Statement II : The colour change is due to the change in oxidation state of potassium chromate.
2. Statement I : Zn2+ is diamagnetic. Statement II : The electrons are lost from 4s orbital to form Zn2+.
Fill in the Blanks
1. Mn2+ can be oxidized to MnO–4 by …….(SnO2, PbO2, BaO)
2. The salts …….. and …….. are isostructural. (FeSO4.7H2O, CuSO4.5H2O,MnSO4 .4H2O, ZnSO4.7H2O)
3. Fehling's solution A consists of an aqueous solution of copper sulphate while Fehling's solution B consists of an alkaline solution of …..
4. The outermost electronic configuration of Cr is ……
5. The compound YBa2CU3O7 which show super conductivity has copper in oxidation state …… assuming that the rare earth element Yttrium in its usual +3 oxidation state.
True/False
1. Copper metal reduces Fe2+, in an acid medium.
2. Dipositive zinc exhibit paramagnetism due to loss of two electrons from 3d orbitals of neutral atom.
Subjective
Questions 1.
Complete and balance the following reactions (i) Zn + NO3– → Zn2+ + NH4+
(ii) Cr2 23 2 7 2 2 242 Cr O C H O C H O Cr −+ + → +
2. State the conditions under which the following preparations are carried out. Give necessary equations which need not be balanced. "Potassium permanganate from manganese dioxide"
3. Show with balanced equations for the reactions when (i) Potassium permanganate interacts with manganese dioxide in presence of potassium hydroxide. (ii) Potassium ferricyanide is heated with concentrated sulphuric acid.
4. Give reason in one or two sentences "Most transition metal compounds are coloured."
5. Complete and balance the following reactions (i) Mn2+ PbO2 → MnO4 + H2O (ii) Ag+ + AsH3 → H3ASO3 + H+
6. Write the balanced chemical equations for the following reactions (i) A mixture of potassium dichromate and sodium chloride is heated with concentrated H2SO4. (ii) Potassium permanganate is added to a hot solution of manganous sulphate.
7. Complete and balance the following reaction 4 2 2 8 2 4 (NH ) S O H O MnSO ...... ...... ..... + + → + + 8. Complete and balance the following reactions (i) [NInO4]2– + H+ → ….+ [MnO4]– + H2O (ii) SO2(aq) + Cr2 O72– + 2H+ → …. + ….+ 9. Write balanced equations for the following : (i) Oxidation of hydrogen peroxide with potassium permanganate in acidic medium.
(ii) Reaction of zinc with dilute nitric acid.
10. A compound of vanadium has a magnetic moment of 1.73 13M. Work out the electronic configuration of the vanadium ion of the compound.
11. Give reasons : CrO3 is an acid anhydride.
12. Moist air Zn 4 white furnes (Purple colour) (M Transition with pungent smell element colourless)
(B) MCl (A) = ← → Identify the metal M and hence MC
l4. Explain the difference in colours of MCl4 and A.
Answers 1. (b) 2.(b) 3. (b) 4. (b) 5. (a) 6. (b) 7. (b) 8. (b) 9.(d) 10. (d) 11. (a) 12. (a) 13. (b) 14. (a) 15.(b) 16.(c)
Objective Questions
11 1. (b,c) 2. (c,d) 3. (a,b,c) 4. (a,b,c,d) 5. (a,b,c) 6. (a,c,d)
Assertion and Reason
1. (c) 2. (b)
Fill in the Blanks
1. PbO 2. FeSO4.7HO and ZnSO4.7H2O 3. Rochelle salt 4. 3d5 4s1 5. 7 x 3 = +
True / False
1. F 2. F
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