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STD 11 - 7. Redox reactions — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 7. Redox reactions4 Marks
MCQ
The equation which is balanced and represents the correct product(s) is :
  • A
    $Li_2O + 2KCl \rightarrow 2LiCl + K_2O$
  • ✓
    $[ CoCl( NH_3 )_5]^+ +5H^+ \rightarrow Co^{2+} +5NH_4^+ +Cl^-$
  • C
    $[ Mg(H_2O)_6]^{2+} +(EDTA)^{4-} \xrightarrow{{excess\,NaOH}} $ $[Mg(EDTA)]^{2+} +6H_2O$
  • D
    $CuSO_4 + 4KCN \rightarrow K_2[Cu(CN)_4]+K_2SO_4$
✓

Answer

Correct option: B.
$[ CoCl( NH_3 )_5]^+ +5H^+ \rightarrow Co^{2+} +5NH_4^+ +Cl^-$
b
Equation $-1$ is not balanced with respect to charge.

Equation $-2$ gives $K _3\left[ Cu ( CN )_4\right]$ as product.

Equation $-3$ reaction is unfavourable in the forward direction $\left( K _2 O\right.$ is unstable, while $LiO _2$ is stable).

Equation $-4$ is correct and balanced.

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