1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
The compound that does not give positive test for nitrogen in Lassaigne's test is
A
B
C
D
2
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green, when the colourless gas is passed through it. The sodium salt is
3
WB JEE 2016
MCQ (Single Correct Answer)
+2
-0.5
Compound X is tested and the results are shown in the table.
Which ions are present in compound 'X'?
| Test | Result |
|---|---|
| Aqueous sodium hydroxide is added, then heated gently. Dilute hydrochloric acid is added. |
Gas given off which turns damp red litmus paper blue. Effervescence, gas given off which turns lime water milky and acidified $${K_2}C{r_2}{O_7}$$ paper green. |
Which ions are present in compound 'X'?
Questions Asked from Practical Chemistry (MCQ (Single Correct Answer))
Number in Brackets after Paper Indicates No. of Questions
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