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1
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
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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
$$\mathrm{NH_4Cl}$$
2
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
3
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.
4
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is :

A
NaFe[Fe(CN)6]
B
Na[Cr(NH3)2(NCS)4]
C
Na2[Fe(CN)5(NO)]
D
Na4[Fe(CN)5(NOS)]
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