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STD 11 - 9. Hydricarbon — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 9. Hydricarbon4 Marks
MCQ
Urea reacts with water to form $A$ which will decompose to form $B. B$ when passed through $Cu ^{2+}( aq ),$ deep blue colour solution $C$ is formed. What is the formula of $C$ from the following$?$
  • A
    $CuCO _{3} \cdot Cu ( OH )_{2}$
  • B
    $CuSO _{4}$
  • ✓
    $\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$
  • D
    $Cu ( OH )_{2}$
✓

Answer

Correct option: C.
$\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$
c
$NH _{2} CONH _{2}+ H _{2} O \rightarrow CO _{2}+ NH _{4} OH$

                                                                 $(A)$

$NH _{4} OH \stackrel{\Delta}{\longrightarrow} NH _{3}+ H _{2} O$

                              $(B)$

$Cu ^{+2}( aq )+4 NH _{3} \rightarrow\left[ Cu \left( NH _{3}\right)_{4}\right]^{+2}($ deep blue $)$

                                              $(C)$

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