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FAQ

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181. ) CaCO3 + CO2 + H2O = Ca(HCO3)2 -

) Cl2 + 2KY = 2KCl + Y2 -

) MgCO3 = MgO + CO2 -

) BaO + HCl = BaCl2 + H2O -

182. ) CaCO3 + 2HNO3 = Ca(NO3)2 + CO2 + H2O -

) Zn + 2NaOH = Na2ZnO2 + H2 -

) 2CrO3 = Cr2O3 + 1,5O2 -

) CuSO4 + 5H2O = CuSO4*5H2O -

183. ) 2H3BO3 = B2O3 + 3H2O -

) CO2 + NaOH = NaHCO3 -

) Fe(OH)2Cl + HCl = FeCl3 + H2O -

) 2Na + H2O = NaOH + H2 -

184. ) 3P + 5HNO3 + 2H2O = 3H3PO4 + 5NO - -

) Mg(OH)2 + HCl = MgOHCl + H2O - -

) 6Cl2 + 12KOH = 10KCl + 2KClO3 + 6H2O - -

) SO3 + H2O = H2SO4 - -

185. ) CO2+BaO = BaCO3 - -

) 2FeCl2 + Cl2 = 2FeCl3 - -

) Zn + H2SO4 = ZnSO4 + H2 - -

) NaHCO3 + NaOH = Na2CO3 + H2O - -

186. a) 2NO2 + 2KOH = KNO2 + KNO3 + H2O - -

) MgOHCl + HCl = MgCl2 + H2O - -

) FeO + H2SO4 = FeSO4 + H2O - -

) 2KClO3 = 2KCl + 3O2 - -

187. a) SiO2 + 2K2CO3 = K4SiO4 + CO2

) Na3N + 3H2O = 3NaOH + NH3

) IF5 + 6KOH = KIO3 + 5KF + 3H2O

188. a) Al2S3 + 6H2O = 2Al(OH)3 +3H2S

) 12HNO3 +P4O10 = 4H3PO4 + 6N2O5

) ZnSO4 +4KHCO3 = ZnCO3 + K2SO4 + K2CO3 +2CO2 +2H2O

189. a) Ca3P2 + 6H2O = 3Ca(OH)2 + 2PH3

) B2O3 + 3CaF2 + 3H2SO4 = 2BF3 + 3CaSO4 + 3H2O

) Al2(SO4)3 + 3Na2CO3 +3H2O = 2Al(OH)3 + 3Na2SO4 + 3CO2

190. a)Al4C3 + 12H2O = 4Al(OH)3 + 3CH4

) Al2O3 + Na2CO3 = 2NaAlO2 + CO2

) 2Na2HPO4 = Na4P2O7 + H2O

191. P-3H3, Na3P-3, H3P+1O2 H3P+3O3, H3P+5O4, HP+2O3, H4P+52O7, HP+5O42- , H2P+5O4-, P+5O43-, KH2P+5O4 .

192. HCl-1, FeCl3-1, HCl+7O4, Cl+3F3, Cl+7F7, Cl+1O, Cl+3O2-1, Cl+5O3-1 , Cl+7O4-1, Cl+72O7.

193.

K2SO3 Mg(HS)2 KAl(SO4)2 NaHSO4 SO32- SO42- H2S SO2 SF6
S +4 -2 +6 +6 +4 +6 -2 +4 +6

194.

FeO Fe2O3 Fe2(SO4)3 FeOHSO4 (FeOH)2SO4 BaFeO2 NaFeO2 [Fe(CN)6]4-
Fe +2 +3 +3 +3 +2 +6 +3 +2

195.

CuO Cu2O (CuOH)2CO3 CuCl42- K2CuO2 CuSO4*5H2O
Cu +2 +1 +2 +2 +2 +2

196. MnO2 - - , . .

MnO2 + KNO3 + 2KOH = K2MnO4 + KNO2 +H2O, Mn+4 - 2e- = Mn+6
3MnO2 + 4Al = 2Al2O3 + 3Mn Mn+4 +24e- = Mn0

Mn - , .. , .

Mn + u(NO3)2 = Mn(NO3)2 + Cu, Mn0 - 2e- = Mn+2

KMnO4 - , .

2KMnO4 + 5NO + 3H2SO4 = 2MnSO4 + 5NO2 + K2SO4 +3H2O, Mn+6 + 4e- = Mn+2 -

197. SO2 - - , . .

2SO2 + O2 = 2SO3, S+4 - 2e- = S+6

SO2 + H2 = S + H2O, S+4 + 4e- = S0

H2S - , , . H2S + 4H2O2 = H2SO4 + 4H2O, S-2 -8e- = S+6

H2SO4 - , .

2HBr + H2SO4 = Br2 + SO2 + 2H2O, S+6 + 4e- = S+2

198. KI - , , . 2KI + H2O2 + H2SO4 = I2 + K2SO4 + 2H2O, 2I-1 -2e- = I02

HIO4 - , , . IO -14 + 8H+ + 8e- = I-1 + 4 H2O

I2 - - , . , , .

I2 + 5Cl2 + 6H2O = 10HCl + 2HIO3, I02 -10e- = 2I+5 -

I2 + NaHSO3 + H2O = 2HI + NaHSO4, I2 + 2e- = 2I-1 -

199. Pb(NO3)2 - - , . , , .

Pb(NO3)2 + Ca =. Ca(NO3)2 + Pb, Pb+2 +2e- = Pb0

3Pb(NO3)2 + 8HNO3 = 3Pb(NO3)4 + 2NO +4H2O, Pb+2 -2e- = Pb+4

PbO2 - , , . PbO2 + SO4-2 +4H+ +2e- = PbSO4 +2H2O

Pb - , , . 3Pb + 8HNO3 = 3Pb(NO3)2 + 2NO +4H2O, Pb0 -2e- = Pb+2

200. NH3 - , , . 2 NH3 -6- = N2 + 6H+

KNO2 - - , . , , .

2NO2- +4H2O +6- = N2 + 8OH- -

NO2- + 2OH- -2- = NO3- + H2O -

KNO3 - , , . 4HNO3 + 3As2O5 + 7H2O = 6H3AsO4 + 4NO, N+5 +3e- = N+2

201.

) 2HBr + H2SO4 = Br2 + SO2 + 2H2O,
2Br -1 - 2e- = Br20 S+6 + 4e- = S+2 2Br -1 - 2e- = Br2 SO4-2 + 4H+ + 2e- = SO2 + 2H2O
. (HBr) = / = 81/2 = 40.5/, (H2SO4) = 98/2 = 49 /
  ) MnSO4 + Ca(ClO)2 + 4NaOH = Na2MnO4 + CaCl2 + Na2SO4 + 2H2O
Mn2+ - 4e- = Mn+6 Cl+1 + 2e- = Cl-1 Mn2+ + 8OH- - 4e- = MnO42- + 4H2O ClO-1 + H2O + 2e- = Cl-1 + 2OH-
. (MnSO4)= / = 151/4 = 37.75 /, (Ca(ClO)2) = 143/2 = 71.5 /
  B) 5FeS + 27HNO3 = 5Fe(NO3)2 + 5H2SO4 + 9NO + 7H2O
Fe+2 - 1e- = Fe+3 N+5 + 3e- = N+2 S-2 -8e- = S+6 FeS +4H2O - 9e- = Fe+3 + SO4-2 + 8H+ NO3- + 6H+ + 5e- = NO + 3H2O
. (FeS) = / = 88/9 = 9.8 /, (HNO3) = 63/5 = 12.6 /

202.

) FeSO4 + K2Cr2O7 + 7H2SO4 = 3Fe2(SO4)3 + Cr2 (SO4)3 + K2SO4 + 7H2O
Fe+2 - 1e- = Fe+3 Cr+6 +3e- = Cr+3 Fe+2 - 1e- = Fe+3 Cr2O7 -2 + 14H+ + 6e- = 2Cr+3+ 7H2O
. (FeSO4) = / = 152/1 = 152 /, (K2Cr2O7) = 294/6 = 49 /
  ) BiCl3 + 3SnCl2 + 18KOH = 2Bi + 3K2SnO3 + 12KCl + 9H2O
Bi3+ +3e- = Bi0 Cl+5 + 6e- = Cl-1 Cr2O3 + 10OH- - 6e- = 2CrO42- + 5H2O MnO4- + 8H+ + 5e- = Mn2+ + 4H2O
. (BiCl3) = / = 315.5/ = 105.2 /, (SnCl2) = 190/2 = 95 /
  B) 4H2O2 + H2S = H2SO4 + 4H2O
S2- - 8e- = S+6 O- + 1e- = O-2 H2S + 4H2O - 8e- = SO42- + 10H+ H2O2 + 2H+ + 2e- = 2H2O
. (H2O2) = / = 34/2 = 17 /, (H2S) = 34/8 = 4.25 /

203.
) 3Na2SO3 + K2Cr2O7 + 4H2SO4 = 3Na2SO4 + Cr2(SO4)3 + K2SO4 + 4H2O
S+4 - 2e- = S+6 Cr+6 + 3e- = Cr+3 SO32- + H2O - 2e- = SO42- + 2H+ Cr2O7-2 + 14H+ + 6e- = 2Cr+3 + 7H2O
. (Na2SO3) = / = 126/2 = 63 /, (K2Cr2O7) = 294/6 = 49 /
  ) 3MnO2 + KClO3 + 6KOH = 3K2MnO4 + KCl + 3H2O
Mn4+ - 2e- = Mn+6 Cl+5 + 6e- = Cl-1 MnO2 + 4OH- - 2e- = MnO4-2 + 2H2O ClO3- + 3H2O + 6e- = Cl- +6OH-
. (MnO2) = / = 87/2 = 43.5 /, (KClO3) = 122.5/6 = 20.4 /
  B) 5Cl2 + I2 + 6H2O = 10HCl + 2HIO3
I2 - 10e- = 2I+5 Cl2 + 2e- = 2Cl-1 I2 +6H2O - 10e- = 2IO3- + 12H+ Cl2 + 2e- = 2Cl-1
. (I2) = / = 254/10 = 25.4 /, (Cl2) = 71/2 = 35.5 /

204.

) 5NO + 2KMnO4 + 3H2SO4 = 2MnSO4 + 5NO2 + K2SO4 + 3H2O
N+2 - 2e- = N+4 Mn+7 + 5e- = Mn+2 NO + H2O - 2e- = NO2 + 2H+ MnO4- + 8H+ + 5e- = Mn+2 + 4H2O
. (NO) = / = 30/2 = 15 /, (KMnO4) = 158/5 = 31.6 /
  ) Cr2O3 + KClO3 + 4KOH = 2K2CrO4 + KCl + 2H2O
2Cr3+ - 6e- = 2Cr+6 Cl+5 + 6e- = Cl-1 Cr2O3 + 10OH- - 6e- = 2CrO42- + 5H2O ClO3- + 3H2O + 6e- = Cl- + 6OH-
. (Cr2O3) = / = 152/6 = 25.3 /, (KClO3) = 122.5/6 = 20.4 /
  B) 3As2O3 + 4HNO3 + 7H2O = 6H3AsO4 + 4NO
2As+3 - 4e- = 2As+5 N+5 + 3e- = N+2 As2O3 +5H2O - 4e- = 2AsO43- + 10H+ NO3- + 4H+ + 3e- = NO + 2H2O
. (As2O3) = / = 198/4 = 49.5 /, (HNO3) = 63/3 = 21 /

205.

) 6FeSO4 + KClO3 + 3H2SO4 = 3Fe2(SO4)3 + KCl + 3H2O
Fe+2 - 1e- = Fe+3 Cl+5 + 6e- = Cl- Fe+2 - 1e- = Fe+3 ClO3- + 6H+ + 6e- = Cl- + 3H2O
. (FeSO4) = / = 152/1 = 152 /, (KClO3) = 122.5/6 = 20.4 /
  ) MnO2 + KNO3 + 2KOH = K2MnO4 + KNO2 + H2O
Mn+4 - 2e- = Mn+6 N+5 + 2e- = N+3 MnO2 + 4OH- - 2e- = MnO42- + 2H2O NO3- + H2O + 2e- = NO2- + 2OH-
. (MnO2) = / = 87/2 = 43.5 /, (KNO3) = 101/2 = 50.5 /
  B) 4Cd + 10HNO3 = 4Cd(NO3)2 + N2O + 5H2O
Cd0 - 2e- = Cd+2 N+5 + 4e- = N+1 Cd0 - 2e- = Cd+2 2NO3- + 10H+ + 8e- = N2O + 5H2O
. (Cd) = / = 112/2 = 56 /, (HNO3) = 63/8 = 7.9 /

206.

) 3SnCl2 + K2Cr2O7 + 7H2SO4 = 3Sn(SO4)2 + 2CrCl3 + K2SO4 + 7H2O
Sn+2 - 2e- = Sn+4 Cr+6 + 3e- = Cr+3 Sn+2 - 2e- = Sn+4 Cr2O7-2 + 14H+ + 6e- = 2Cr+3 + 7H2O
. (SnCl2) = / = 190/2 = 95 /, (K2Cr2O7) = 294/6 = 49 /
  ) 3Sb2O3 + 4HNO3 + 7H2O = 6H3SbO4 + 4NO
2Sb+3 - 4e- = 2Sb+5 N+5 + 3e- = N+2 Sb2O3 + 5H2O -4e- = 2SbO43- + 10H+ NO3- + 4H+ +3e- = NO + 2H2O
. (Sb2O3) = / = 292/4 = 73 /, (HNO3) = 63/3 = 21 /
  B) I2 + 5H2O2 = 4H2O + 2HIO3
I2 - 10e- = 2I+5 O-1 + 1e- = O-2 I2 +6H2O - 10e- = 2IO3- + 12H+ H2O2 + 2H+ +2e- = 2H2O
. (I2) = / = 254/10 = 25.4 /, (H2O2) = 34/2 = 17 /

207.
) 2HBr + 7H2SO4 = Br2 + SO2 + 2H2O
2Br-1 - 2e- = Br2 S+6 + 2e- = S+4 2Br -1 - 2e- = Br2 SO4-2 + 4H+ + 2e- = SO2 + 2H2O
. (HBr) = / = 81/2 = 40.5/, (H2SO4) = 98/2 = 49 /
  ) 5FeCl2 + KMnO4 + 8HCl = 5FeCl3 + MnCl2 + KCl +4H2O
Fe+2 - 1e- = Fe+3 Mn+7 + 5e- = Mn+2 Fe+2 - 1e- = Fe+3 MnO4- + 8H+ + 5e- = Mn2+ + 4H2O
. (FeCl2) = / = 127/1 = 127 /, (KMnO4) = 158/5 = 31.6 /
  B) Sb2O3 + Br2 + 10NaOH = 2Na3SbO4 + 4NaBr +5H2O
2Sb+3 - 4e- = 2Sb+5 Br2 +2e- = 2Br -1 Sb2O3 + 10OH- - 4e- = 2SbO43- + 5 H2O Br2 +2e- = 2Br -1
. (Br2) = / = 160/2 = 80 /, (Sb2O3) = 292/4 = 73 /

208.

) 2NaI + 2NaNO2 + 2H2SO4 = I2 + 2NO + 2Na2SO4 + 2H2O
2I- - 2e- = I2 N+3 + 1e- = N+2 2I- - 2e- = I2 NO2- + 2H+ + 1e- = NO + H2O
. (NaI) = / = 150/2 = 75 /, (NaNO2) = 69/1 = 69 /
  ) 2Bi(NO3)3 + 3SnCl2 + 18NaOH = 2Bi + 3Na2SnO3 + 3NaNO3 + 6NaCl + 9H2O
Bi3+ + 3e- = Bi0 Sn+2 - 2e- = Sn+4 Bi3+ + 3e- = Bi0 Sn+2 + 6OH- - 2e- = SnO32- + 3H2O
. (Bi(NO3)3) = / = 395/3 = 131.7 /, (SnCl2) = 190/2 = 95 /
  B) 5Zn + 12HNO3 = 5Zn(NO3)2 + N2 + 6H2O
Zn0 - 2e- = Zn+2 2N+5 +10e- = N20 Zn0 - 2e- = Zn+2 2NO3- + 12H+ + 10e- = N2 + 6H2O
. (Zn) = / = 65.4/2 = 32.7 /, (HNO3) = 63/10 = 6.3 /

209.

) CuS + 10HNO3 = Cu(NO3)2 + H2SO4 + 8NO2 + 2H2O
S2- - 8e- = S+6 N+5 + 1e- = N+4 S2- + 4H2O - 8e- = SO42- + 8H+ NO3- + 2H+ + 1e- = NO2 + H2O
. (CuS) = / = 96/8 = 12 /, (HNO3) = 63/1 = 69 /
  ) Cl2 + NaHSO3 + H2O = 2HCl + NaHSO4,
Cl2 + 2e- = 2Cl-1 - S+4 - 2e- = S+6 Cl2 + 2e- = 2Cl-1 HSO3- + H2O - 2e- = HSO4- + 2H+
. (Cl2) = / = 71/2 = 35.5 /, (NaHSO3) = 104/2 = 52 /
  B) Fe2O3 + 3KNO3 + 4KOH = 2K2FeO4 + 3KNO2 +2H2O
2Fe3+ - 6e- = 2Fe+6 N+5 +2e- = N+3 Fe2O3 + 10OH- - 6e- = 2FeO4-2 + 5H2O NO3- + H2O + 2e- = NO2- + 2OH-
. (Fe2O3) = / = 160/6 = 26.7 /, (KNO3) = 101/2 = 50.5 /

210.

) Cr2(SO4)3 + 3NaClO + 10KOH = 2K2CrO4 + 3NaCl + K2SO4 + 5H2O
Cr3+ - 3e- = Cr+6 Cl+1 + 2e- = Cl-1 Cr3+ + 8OH- - 3e- = CrO42- + 4H2O ClO- + H2O + 2e- = Cl- + 2OH-
. (Cr2(SO4)3) = / = 392/3 = 130.7 /, (NaClO) = 83.5/2 = 41.8 /
  ) 5Na2SO3 + 2KMnO4 + 3H2SO4 = 5Na2SO4 + 2MnSO4 + K2SO4 + 3H2O
S4+ - 2e- = S+6 Mn+7 + 5e- = Mn+2 SO32- + H2O - 2e- = SO42- + 2H+ MnO4- + 8H+ + 5e- = Mn2+ + 4H2O
. (Na2SO3) = / = 144/2 = 72 /, (KMnO4) = 158/5 = 31.6 /
  B) 2KI + H2O2 + H2SO4 = I2 + K2SO4 + 2H2O
2I- - 2e- = I2 O- + 1e- = O2- 2I- - 2e- = I2 H2O2 + 2H+ + 2e- = 2H2O
. (KI) = / = 166/2 = 83 /, (H2O2) = 34/2 = 17 /

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