1
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The increasing order of $$\mathrm{pK_a}$$ for the following phenols is

(A) 2, 4 - Dinitrophenol

(B) 4 - Nitrophenol

(C) 2, 4, 5 - Trimethylphenol

(D) Phenol

(E) 3-Chlorophenol

Choose the correct answer from the option given below :

A
(A), (E), (B), (D), (C)
B
(C), (E), (D), (B), (A)
C
(C), (D), (E), (B), (A)
D
(A), (B), (E), (D), (C)
2
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

"A" obtained by Ostwald's method involving air oxidation of NH$$_3$$, upon further air oxidation produces "B", "B" on hydration forms an oxoacid of Nitrogen along with evolution of "A". The oxoacid also produces "A" and gives positive brown ring test.

Identify A and B, respectively :

A
$$\mathrm{N_2O_3,NO_2}$$
B
$$\mathrm{NO_2,N_2O_5}$$
C
$$\mathrm{NO_2,N_2O_4}$$
D
$$\mathrm{NO,NO_2}$$
3
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which of the following salt solutions would coagulate the colloid solution formed when $$\mathrm{FeCl_3}$$ is added to $$\mathrm{NaOH}$$ solution, at the fastest rate?

A
10 mL of 0.15 mol dm$$^{-3}$$ CaCl$$_2$$
B
10 mL of 0.2 mol dm$$^{-3}$$ AlCl$$_3$$
C
10 mL of 0.1 mol dm$$^{-3}$$ Na$$_2$$SO$$_4$$
D
10 mL of 0.1 mol dm$$^{-3}$$ Ca$$_3$$(PO$$_4$$)$$_2$$
4
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

For 1 mol of gas, the plot of pV vs. p is shown below. p is the pressure and V is the volume of the gas

JEE Main 2023 (Online) 29th January Morning Shift Chemistry - Gaseous State Question 7 English

What is the value of compressibility factor at point A ?

A
$$1+\frac{b}{V}$$
B
$$1-\frac{a}{RTV}$$
C
$$1+\frac{a}{RTV}$$
D
$$1-\frac{b}{V}$$
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