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

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
$$\mathrm{NH_4Cl}$$
3
JEE Main 2022 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In base vs. acid titration, at the end point methyl orange is present as

A
quinonoid form
B
heterocyclic form
C
phenolic form
D
benzenoid form
4
JEE Main 2022 (Online) 30th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The reagent neutral ferric chloride is used to detect the presence of ______________

A
sulphide ion and alcoholic $$-$$OH group.
B
acetate ion and phenolic $$-$$OH group.
C
sulphide ion and phenolic $$-$$OH group.
D
acetate ion and alcoholic $$-$$OH group.
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