JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

1 Medium

1 of 1

Analyzing +4 | -1

Assertion: Out of

CrO_3 \,\&\, Al_2O_3, CrO_3

having lower melting point than

Al_2O_3

.
Reason: Oxidation state of

Cr

CrO_3

is high

View answer and explanation

Correct option: B

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Option B is correct because both the assertion and the reason are correct, but the reason does not explain the assertion. The high oxidation state of Cr makes it more covalent, leading to a lower melting point.

More Questions from d & f- BLOCK ELEMENTS

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Mercury is transported in metal containers made of: Cadmipone is a mixture of: The number of element from the following that do not belong to lanthanoids is :
Eu, Cm, Er, Tb, Yb and Lu Statement-I:

{Sm}^{3+}

{Dy}^{3+}

have same colour (yellow).

Statement-II: Both ions are having same number of unpaired electrons. The most common oxidation state of Lanthanoid
elements is +3. Which of the following is likely to
also form other oxidation state? A mixture of

\mathrm{Ti}{\mathrm{O}_2}

and

\mathrm{BaS}{\mathrm{O}_4}

is called