1
JEE Main 2022 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1

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
2
JEE Main 2022 (Online) 30th June Morning Shift
MCQ (Single Correct Answer)
+4
-1

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.
3
JEE Main 2022 (Online) 28th June Morning Shift
MCQ (Single Correct Answer)
+4
-1

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)]
4
JEE Main 2022 (Online) 26th June Morning Shift
MCQ (Single Correct Answer)
+4
-1

Given below are two statements :

Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give NaCN and Na2S.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
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