JEE Main 2022 (Online) 25th July Morning Shift | p-Block Elements Question 87 | Chemistry

A $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{}^{573\,K}} $$ Red phosphorus $$\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{under\,pressure}^{heat\,;\,803\,K}} $$ B

Red phosphorus is obtained by heating "A" at 573 K, and can be converted to "B" by heating at 803 K under pressure.

A and B, respectively, are

$$\beta$$-black phosphorus and white phosphorus.

white phosphorus and $$\beta$$-black phosphorus.

$$\alpha$$-black phosphorus and white phosphorus.

white phosphorus and $$\alpha$$-black phosphorus.

JEE Main 2022 (Online) 29th June Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Aqueous solution of which of the following boron compounds will be strongly basic in nature?

NaBH₄

LiBH₄

B₂H₆

Na₂B₄O₇

JEE Main 2022 (Online) 29th June Evening Shift

MCQ (Single Correct Answer)

-1

Sulphur dioxide is one of the components of polluted air. SO₂ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by SO₂ is :

2SO₂ + O₂ $$\to$$ 2SO₃

SO₂ + O₃ $$\to$$ SO₃ + O₂

SO₂ + H₂O₂ $$\to$$ H₂SO₄

2SO₂ + O₂ + 2H₂O $$\to$$ 2H₂SO₄

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