JEE Main 2021 (Online) 26th February Evening Shift | p-Block Elements Question 91 | Chemistry

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JEE Main 2021 (Online) 26th February Evening Shift

MCQ (Single Correct Answer)

-1

Which pair of oxides is acidic in nature?

CaO, SiO₂

B₂O₃, CaO

B₂O₃, SiO₂

N₂O, BaO

JEE Main 2021 (Online) 26th February Morning Shift

MCQ (Single Correct Answer)

-1

Find A, B and C in the following reactions :

$$N{H_3} + A + C{O_2} \to {(N{H_4})_2}C{O_3}$$

$${(N{H_4})_2}C{O_3} + {H_2}O + B \to N{H_4}HC{O_3}$$

$$N{H_4}HC{O_3} + NaCl \to N{H_4}Cl + C$$

$$A - {O_2};B - C{O_2};C - N{a_2}C{O_3}$$

$$A - {H_2}O;B - {O_2};C - NaHC{O_3}$$

$$A - {H_2}O;B - {O_2};C - N{a_2}C{O_3}$$

$$A - {H_2}O;B - C{O_2};C - NaHC{O_3}$$

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-1

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 Evening Shift

MCQ (Single Correct Answer)

-1

Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?

Nitric acid

Sodium hydroxide

Ammonia

Hydrochloric acid