JEE Main 2021 (Online) 26th February Morning Shift | p-Block Elements Question 155 | Chemistry

On treating a compound with warm dil. H₂SO₄, gas X is evolved which turns K₂Cr₂O₇ paper acidified with dil. H₂SO₄ to a green compound Y. X and Y respectively are :

X = SO₂, Y = Cr₂O₃

X = SO₃, Y = Cr₂(SO₄)₃

X = SO₃, Y = Cr₂O₃

X = SO₂, Y = Cr₂(SO₄)₃

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

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Out of Syllabus

Given below are two statements :

Statement I : $$\alpha$$ and $$\beta$$ forms of sulphur can change reversibly between themselves with slow heating or slow cooling.

Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur.

In the light of the above statements, choose the correct answer from the options given below :

Statement I is true but Statement II is false.

Statement I is false but Statement II is true.

Both Statement I and Statement II are true.

Both Statement I and Statement II are false.

JEE Main 2021 (Online) 25th February Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The correct statement about B₂H₆ is :

Its fragment, BH₃, behaves as a Lewis base.

All B$$-$$H$$-$$B angles are of 120$$^\circ$$.

The two B$$-$$H$$-$$B bonds are not of same length.