Chemistry-Functional Group Tests
NEET Chemistry Functional Group Tests MCQ Question
Type: MCQ-numerical-Hard-Class 12
When performing the qualitative analysis test to confirm the presence of Co2+ ions using potassium nitrite, how many moles of potassium nitrite (KNO2) are required to react with one mole of CoCl2?
A
7 moles
B
5 moles
C
3 moles
D
1 mole
Correct Answer
Option A
Detailed Explanation
According to the reaction CoCl2 + 7KNO2 + 2CH3COOH → K3[Co(NO2)6] + 2KCl + 2CH3COOK + NO + H2O, 7 moles of KNO2 are needed to react with one mole of CoCl2.
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