JEE (Advanced) 2020 Paper-2

Instructions

For the following questions answer them individually

Question 21

In the chemical reaction between stoichiometric quantities of $$KMnO_4$$ and KI in weakly basic solution, what is the number of moles of $$I_2$$ released for 4 moles of $$KMnO_4$$ consumed?

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Question 22

A n acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of 1 mL of 3% $$H_2O_2$$, a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound ‘X’. What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of X?

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Question 23

The structure of a peptide is given below.

If the absolute values of the net charge of the peptide at pH = 2, pH = 6, and pH = 11 are $$\mid 𝑧_1 \mid, \mid 𝑧_2 \mid$$, and $$\mid 𝑧_3 \mid$$, respectively, then what is $$\mid 𝑧_1 \mid + \mid 𝑧_2 \mid + \mid 𝑧_3 \mid$$?

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Question 24

An organic compound $$(C_8H_{10}O_2)$$ rotates plane-polarized light. It produces pink color with neutral $$FeCl_3$$ solution. What is the total number of all the possible isomers for this compound?

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Question 25

In an experiment, 𝑚 grams of a compound X (gas/liquid/solid) taken in a container is loaded in a balance as shown in figure I below. In the presence of a magnetic field, the pan with X is either deflected upwards (figure II), or deflected downwards (figure III), depending on the compound X. Identify the correct statement(s).

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Question 26

Which of the following plots is(are) correct for the given reaction?
($$[P]_0$$ is the initial concentration of P)

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Question 27

Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?

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Question 28

Choose the correct statement(s) among the following.

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Question 29

Consider the following four compounds I, II, III, and IV.

Choose the correct statement(s).

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Question 30

Consider the following transformations of a compound P.

Choose the correct option(s).

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