Assertion :Chromium oxide and Chromium nitrate are green in colour. Reason: Chromium chloride is violet in colour.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
${C r}_{2} O_{3} -$ green colour
$C r {({N O}_{3})}_{3} -$ green (anhydrous)
${C r C l}_{3} -$ violet solid
Clearly reason doesn't explain assertion.

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Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :Chromium oxide and Chromium nitrate are green in colour. Reason: Chromium chloride is violet in colour.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionCr2O3− green colourCr(NO3)3− green (anhydrous)CrCl3− violet solidClearly reason doesn't explain assertion.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
${C r}_{2} O_{3} -$ green colour
$C r {({N O}_{3})}_{3} -$ green (anhydrous)
${C r C l}_{3} -$ violet solid
Clearly reason doesn't explain assertion.