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1
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In Dumas method for the estimation of $\mathrm{N}_{2}$, the sample is heated with copper oxide and the gas evolved is passed over :
A
Copper oxide
B
Copper gauze
C
$\mathrm{Pd}$
D
$\mathrm{Ni}$
2
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match items of column I and II

Column I (Mixture of compounds) Column II (Separation Technique)
A. $$\mathrm{H_2O/CH_2Cl_2}$$ i. Crystalization
B. JEE Main 2023 (Online) 31st January Morning Shift Chemistry - Practical Organic Chemistry Question 9 English ii. Differential solvent extraction
C. Kerosene / Naphthalene iii. Column chromatography
D. $$\mathrm{C_6H_{12}O_6/NaCl}$$ iv. Fractional Distillation

Correct match is

A
A-(ii), B-(iv), C-(i), D-(iii)
B
A-(iii), B-(iv), C-(ii), D-(i)
C
A-(i), B-(iii), C-(ii), D-(iv)
D
A-(ii), B-(iii), C-(iv), D-(i)
3
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II:

List I (Mixture) List II (Separation Technique)
A. $\mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2$ I. Steam distillation
B. $\mathrm{C}_6 \mathrm{H}_{14}+\mathrm{C}_5 \mathrm{H}_{12}$ II. Differential extraction
C. $\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2+\mathrm{H}_2 \mathrm{O}$ III. Distillation
D. $\text { Organic compound in } \mathrm{H}_2 \mathrm{O}$ IV. Fractional distillation
A
A-III, B-I, C-IV, D-II
B
A-II, B-I, C-III, D-IV
C
A-IV, B-I, C-III, D-II
D
A-III, B-IV, C-I, D-II
4
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

Compound that will give positive Lassaigne's test for both nitrogen and halogen is :

A
$$\mathrm{NH_2OH.HCl}$$
B
$$\mathrm{N_2H_4.HCl}$$
C
$$\mathrm{CH_3NH_2.HCl}$$
D
$$\mathrm{NH_4Cl}$$
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