You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Preparation of Alkanes with Grignard Reagent

Assertion :To...

Question

Assertion :To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange. Reason: The colour change is due to the oxidation of potassium chromate.

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

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

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Assertion is correct but Reason is incorrect

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Assertion is incorrect but Reason is correct

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C Assertion is correct but Reason is incorrect
In presence of acid, chromate changes into dichromate nad colour changes accordingly.
Reaction:
$+ 6 2 C r O_{4}^{2 -} (y e l l o w) + 2 H^{+} \to + 6 C r_{2} O_{7}^{2 -} (o r a n g e) + H_{2} O$
There is no change in oxidation state of Cr.

Suggest Corrections

Similar questions

Q. Assertion :To a solution of potassium chromate, if a strong acid is added, it changes its color from yellow to orange. Reason: The color change is due to the change in oxidation state of potassium chromate.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Assertion: The impurities such as

{SiO}_{2}

present in iron ore is removed by

{CaCO}_{3}

.

Reason:

CaO

formed by decomposition of

{CaCO}_{3}

reacts with

{SiO}_{2}

to form slag.

Join BYJU'S Learning Program

Assertion :To a solution of potassium chromate if a strong acid is added it changes its colour from yellow to orange. Reason: The colour change is due to the oxidation of potassium chromate.

The correct option is C Assertion is correct but Reason is incorrectIn presence of acid, chromate changes into dichromate nad colour changes accordingly.Reaction: +62CrO2−4(yellow)+2H+→+6Cr2O2−7(orange)+H2OThere is no change in oxidation state of Cr.