AIIMS 2003
- Exam
- AIIMS
- Year
- 2003
- Subject
- Chemistry
- Chapter
- d and f Block Elements
AIIMS 2003 · Chemistry · d and f Block Elements
Assertion : Solution of Na_2 CrO_4 in water is coloured. Reason:...
Assertion : Solution of in water is coloured.
Reason: Oxidation state of in is +6 .
Options
- AIf both assertion and reason are true and the reason is the correct explanation of the assertion
- BIf both assertion and reason are true and the reason is not the correct explanation of the assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion
Step-by-step solution
solution in water is yellow in colour, when acidified changes to orange colour (due to the formation of ions).
\mathrm{Na}}_{2} \mathrm{CrO}}_{4}+\mathrm{H}}_{2} \mathrm{SO}}_{4} \rightarrow \mathrm{Na}}_{2} \mathrm{Cr}}_{2} \mathrm{O}}_{7}+ \mathrm{Na}}_{2} \mathrm{SO}}_{4}+ \mathrm{H}}_{2} Oxidation state :
Let oxidation state of be .
\Rightarrow 2(+1)+x+4(-2)=0 \Rightarrow x=+6