1
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List I
(Atomic number)
List II
(Block of periodic table)
A. 37 I. p-block
B. 78 II. d-block
C. 52 III. f-block
D. 65 IV. s-block

Choose the correct answer from the options given below :

A
A - II, B - IV, C - I, D - III
B
A - IV, B - III, C - II, D - I
C
A - IV, B - II, C - I, D - III
D
A - I, B - III, C - IV, D - II
2
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List I
(molecules/ions)
List II
(No. of lone pairs of e$$^-$$ on central atom)
A. $$\mathrm{IF_7}$$ I. Three
B. $$\mathrm{ICl}$$$$_4^ - $$ II. One
C. $$\mathrm{XeF_6}$$ III. Two
D. $$\mathrm{XeF_2}$$ IV. Zero

Choose the correct answer from the options given below :

A
A - II, B - I, C - IV, D - III
B
A - IV, B - I, C - II, D - III
C
A - IV, B - III, C - II, D - I
D
A - II, B - III, C - IV, D - I
3
JEE Main 2023 (Online) 30th January Morning Shift
Numerical
+4
-1
Change Language

Some amount of dichloromethane $$\left(\mathrm{CH}_{2} \mathrm{Cl}_{2}\right)$$ is added to $$671.141 \mathrm{~mL}$$ of chloroform $$\left(\mathrm{CHCl}_{3}\right)$$ to prepare $$2.6 \times 10^{-3} \mathrm{M}$$ solution of $$\mathrm{CH}_{2} \mathrm{Cl}_{2}(\mathrm{DCM})$$. The concentration of $$\mathrm{DCM}$$ is ___________ ppm (by mass).

Given :

atomic mass : C = 12

H = 1

Cl = 35.5

density of $$\mathrm{CHCl}_{3}=1.49 \mathrm{~g} \mathrm{~cm}^{-3}$$

Your input ____
4
JEE Main 2023 (Online) 30th January Morning Shift
Numerical
+4
-1
Change Language

If compound A reacts with B following first order kinetics with rate constant $$2.011 \times 10^{-3} \mathrm{~s}^{-1}$$. The time taken by $$\mathrm{A}$$ (in seconds) to reduce from $$7 \mathrm{~g}$$ to $$2 \mathrm{~g}$$ will be ___________. (Nearest Integer)

$$[\log 5=0.698, \log 7=0.845, \log 2=0.301]$$

Your input ____
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