Find total number of reagents which can produce I2 from KI solution. Conc. H2SO4, Hg(NO3)2 solution, CuSO4 solution, Conc. H3PO4, K2Cr2O7/H+, Cl2 water, Pb(CH3COO)2 solution, Ca(OCl)Cl/H+, NaNO2 + dil

Question

Find total number of reagents which can produce I2 from KI solution. Conc. H2SO4, Hg(NO3)2 solution, CuSO4 solution, Conc. H3PO4, K2Cr2O7/H+, Cl2 water, Pb(CH3COO)2 solution, Ca(OCl)Cl/H+, NaNO2 + dil. HCl

Prashant Kotian · Accepted Answer

Correct answer: **6** / CONC. H2SO4 + 2KI -> K2SO4 + HI + 1/2 I2↑. HG(NO3)2 + 2KI -> HGI2↓ + 2KNO3. CUSO4 + KI -> CU2I2↓ + K2SO4 + I2. CR2O7^2-/H+ + KI -> CR3+ + I2. PB(CH3COO)2 + KI -> PBI2↓ + CH3COOK. CA(OCL)CL + KI -> CACL2 + I2. NANO2 + DIL. HCL + KI -> KCL + NACL + NO + I2. (CONC. H3PO4 + KI -> NO OBS.). Step 1: Identify the state of reactants and products. Pb(NO3)2 and NaOH are highly soluble in water, forming a clear solution. Step 2: Observe the chemical change. The reaction leads to the formation of insoluble lead(II) hydroxide, denoted by the downward arrow (Pb(OH)2↓). Step 3: Since a precipitate is formed from soluble starting materials, this reaction belongs to type A (precipitate formation reaction). Thus, the correct option is (a).

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