1
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

An aqueous solution of X on addition of hydrogen peroxide in ice cold conditions gives blue colour to the ethereal layer. Then, X can be

A
acidified potassium chromate
B
alkaline potassium dichromate
C
acidified potassium manganate
D
acidified potassium permanganate
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Determine the specific rate constant of the reaction. If the half-life period of a first order reaction is 1402 s.

A
$$4.94\times10^{-3}~\mathrm{s}^{-1}$$
B
$$0.49\times10^{-3}~\mathrm{s}^{-1}$$
C
$$0.49\times10^{-4}~\mathrm{s}^{-1}$$
D
$$4.94\times10^{-5}~\mathrm{s}^{-1}$$
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Which of the following amino acid (NH$$_2$$CHRCOOH) contains polar R group?

A
Alanine
B
Valine
C
Glycine
D
Glutamine
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Find the correct order of C$$-$$O bond length among CO, CO$$_3^{2-}$$, CO$$_2$$.

A
CO$$_2$$ < CO$$_3^{2-}$$ < CO
B
CO < CO$$_3^{2-}$$ < CO$$_2$$
C
CO$$_3^{2-}$$ < CO$$_2$$ < CO
D
CO < CO$$_2$$ < CO$$_3^{2-}$$
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