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State with balanced equations what happens when : (i) Sulphur dioxide gas is bubbled through an aqueous solution of copper sulphate in presence of potassium thiocyanate. (ii) aqueous solution of ferric sulphate and potassium iodide are mixed. (iii) aqueous solution of potassium manganate and acid are mixed. (iv) aqueous solution of potassium chromate and acid are mixed. (v) potassium permanganate interacts with manganese dioxide in presence of potassium hydroxide; (vi) potassium ferrocyanide is heated with concentrated sulphuric acid; (vii) Gold is dissolved in aqua regia. (viii) Write balanced equations for the extraction of silver from silver glance by cyanide process. (ix) Silver chloride is treated with aqueous sodium cyanide and the product thus formed is allowed to react with zinc in alkaline medium. (x) Cobalt(II) solution reacts with KNO 2 in acetic acid medium. (xi) Write balanced equations for the extraction of copper from copper pyrites by self-reduction. (xii) A mixture of potassium dichromate and sodium chloride is heated with concentrated H 2 SO 4 . (xiii) Iron reacts with cold dilute nitric acid. (xiv) Potassium permanganate is added to a hot solution of manganous sulphate. (xv) Copper reacts with HNO 3 to give NO and NO 2 in molar ratio of 2 : 1. Cu + NHO 3 → ……… + NO + NO 2 ­ + …………… . (xvi) Na 2 CO 3 is added to a solution of copper sulphate. CuSO 4 + Na 2 CO 3 + H 2 O → …………. + Na 2 SO 4 + …………… (xvii) Potassium dichromate and concentrated hydrochloric acid are heated together. (xviii) AgBr + Na 2 S 2 O 3 → ……….. + ……. (xix) (NH 4 ) 2 S 2 O 8 + H 2 O + MnSO 4 → …… + ….. + ….. (xx) [MnO 4 ] 2- +H + → …………… + [MnO 4 ] - + H 2 O (xxi) SO 2 (aq) + Cr 2 O 2- 7 + 2H + → ……………. + …………. + ……….. (xxii) Write a balanced equation for the reaction of argentite with KCN and name the products in solution. (xxiii) Write balanced equations for the oxidation of cuprous oxide to cupric hydroxide by alkaline KMnO 4 . (xxiv) Write balanced equations for the reaction of alkaline perbromate with zinc giving tetrahydroxyzincate anion. (xxv) Write balanced equations for the reaction of zinc with dilute nitric acid.

State with balanced equations what happens when :
(i) Sulphur dioxide gas is bubbled through an aqueous solution of copper sulphate in presence of potassium thiocyanate.
(ii) aqueous solution of ferric sulphate and potassium iodide are mixed.
(iii) aqueous solution of potassium manganate and acid are mixed.
(iv) aqueous solution of potassium chromate and acid are mixed.
(v) potassium permanganate interacts with manganese dioxide in presence of potassium hydroxide;
(vi) potassium ferrocyanide is heated with concentrated sulphuric acid;
(vii) Gold is dissolved in aqua regia.
(viii) Write balanced equations for the extraction of silver from silver glance by cyanide process.
(ix) Silver chloride is treated with aqueous sodium cyanide and the product thus formed is allowed to react with zinc in alkaline medium.
(x) Cobalt(II) solution reacts with KNO2 in acetic acid medium.
(xi) Write balanced equations for the extraction of copper from copper pyrites by self-reduction.
(xii) A mixture of potassium dichromate and sodium chloride is heated with concentrated H2SO4.           
(xiii) Iron reacts with cold dilute nitric acid.
(xiv) Potassium permanganate is added to a hot solution of manganous sulphate.   
(xv) Copper reacts with HNO3 to give NO and NO2 in molar ratio of 2 : 1.    
Cu + NHO3 → ……… + NO + NO2­ + …………… .
(xvi) Na2CO3 is added to a solution of copper sulphate.
CuSO4 + Na2CO3 + H2O → …………. + Na2SO4 + ……………
(xvii) Potassium dichromate and concentrated hydrochloric acid are heated together.
(xviii) AgBr + Na2S2O3 → ……….. + …….
(xix) (NH4)2S2O8 + H2O + MnSO4 → …… + ….. + …..    
(xx) [MnO4]2- +H+ → …………… + [MnO4]- + H2O         
(xxi) SO2 (aq) + Cr2O2-7 + 2H+ → ……………. + …………. + ………..    
(xxii) Write a balanced equation for the reaction of argentite with KCN and name the products in solution.       
(xxiii) Write balanced equations for the oxidation of cuprous oxide to cupric hydroxide by alkaline KMnO4.
(xxiv) Write balanced equations for the reaction of alkaline perbromate with zinc giving tetrahydroxyzincate anion.      
(xxv) Write balanced equations for the reaction of zinc with dilute nitric acid.

Grade:11

1 Answers

Aditi Chauhan
askIITians Faculty 396 Points
9 years ago
(i) 2CuSO4 + SO2 + 2H2O + 2KCNS → 2CuCNS ↓ + K2SO4 + 2H2SO4
Cuprous thiocyanate
(white)
(ii) Fe2(SO4)3 + 2KI → 2FeSO4 + K2SO4 I2
(iii)2MnO_{4}^{2-} + 4H^{+} \rightarrow MnO_{2} + MnO_{4}^{-} + 2H_{2}O
(iv) 2K2CrO4 + H2SO4 → K2Cr2O7 + K2SO4 + H2O
(yellow) (orange red)
(v) 2KMnO4 + 4KOH + MnO2 → 3K2MnO4 + 2H2O or 2KMnO4 + H2O → 2MnO2 + 2KOH + 3[O]
(vi) K4[Fe(CN)6] + 6H2SO4 + 6H2O \overset{heat}{\rightarrow} 2K2SO4 + FeSO4 + 3(NH4)2SO4 + 6CO
(vii) \underbrace{2HCI + HNO_{3}}_{aqua regia}→ NOCI + 2H2O + 2(CI)
Au + 2[CI] \overset{HCI}{\rightarrow}AuCI3 \overset{HCI}{\rightarrow}HAuCI4
Aurochloric acid
(viii) Ag2S + 4NaCN ⇌ 2 Na[Ag(CN)2] + Na2S
(silver glance)
4Na2S + SO2 + 2H2O → 2 Na2SO­4 +NaOH + 2S
[NOTE : Na2S is converted into Na2SO4 to avoid reversibility of first reaction]
2NaAg(CN)2 + Zn → Na2 [Zn (CN)4] + 2Ag
Sod. Zincocyanide
(ix) AgCI + 2NaCN ⇌ NaCI + Na [Ag(CN)2]
2Na[Ag(CN)2] + Zn → Na2[Zn(CN)4] + 2Ag↓
Soluble
(x) CoCI2 + 2KNO2 → Co(NO2)2 + 2KCI
KNO2 + CH3COOH → CH3COOK + HNO2
Co(NO2)­2 + 3KNO2 + 2HNO2 → K3[Co(NO2)6]↓ + NO + H2O
Pot cobaltinitrite
(yellow ppt.)
236-854_55555.png
(xii) K2Cr2O7 + 4naCI + 6H2­SO4 → 2CrO2 CI2 ↑ + 4NaHSO4 + 2KHSO4 + 3H2O
chromyl chloride
(orange)
(xiii) 4Fe + 10HNO3 → 4Fe(NO3)2 + NH4­NO3 + 3H2O
(xiv) 2KMnO4 + 3MnSO4 + 2H2O → 5MnO2 + K2SO4 + 2H2SO4
This is known as Volhard method for estimation of manganese.
(xv) The individual reactions are
3Cu + 8HNO3 (dil.) → 2NO + 3Cu(NO3)2 + 4H2O
Cu + 4HNO3 (dil.) → Cu(NO3)2 + 2NO2 + 2H2O
For the molar ratio of 2 : 1 of NO and NO2, we will have
7Cu + 20HNO3 → 7Cu(NO3)2 + 4NO + 2NO2 + 10H2O
(xvi) 2CuSO4 + 2Na2CO3 + H2O → CuCO3. Cu(OH)2 + 2Na2SO4 + CO2
(xvii) K2Cr2O7 + 14HCI \overset{heat}{\rightarrow} 2KCI + 2CrCI3 + 7H2O + 3CI2
(xviii) AgBr + 2Na2S2O3 → Na3 [Ag(S2O3)2] + NaBr
(xix) (NH4)­2S2O8 + 2H2O + MnSO4 → MnO2 + 2H2SO4 + (NH4)2SO4
(xx) 3[MnO4]2- + 4H+ → MnO2 + 2[MnO4]- + 2H2O
(xxi) 3SO2 + CrO_{7}^{2-} + 2H+ → 2Cr3+ + 3SO_{4}^{2-}+ H2O
(xxii) Ag2S + 2KCN → K[Ag(CN)2] + K2S
(Argentite) potassium
Argentocyanide
(xxiiii) KMnO4 + Cu2O + KOH → 2 Cu(OH)2 + K2MnO4
(xxiv) Zn + 2OH- + BrO_{4}^{-}+ H2O → [Zn(OH)4]2- + BrO_{3}^{-}
(xxv) [Zn + 2HNO3 (dil) → Zn(NO3)2 + 2[H]] * 4
236-1487_78787.jpg

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