Physical Chemistry
Some Basic Concepts of ChemistryAtomic StructureRedox ReactionGaseous StateChemical EquilibriumLiquid SolutionIonic EquilibriumThermodynamicsChemical KineticsRadioactivity and Nuclear ChemistryElectrochemistrySolid StateSurface ChemistryInorganic Chemistry
Periodic TableChemical BondingMetallurgyHydrogen and It's CompoundsSome s Block ElementsSome P Block Elementsd and f Block ElementsCoordination CompoundsOrganic Chemistry
IUPAC NomenclaturesGeneral Organic ChemistryIsomerismHydrocarbonsHalogen DerivativesAlcohol and EtherAldehyde and KetoneAromatic ChemistryCarbonyl CompoundsCarboxylic Acids and AminesPolymersBiomoleculesPractical ChemistryChemistry In Everyday LifePractical Chemistry
Practice QuestionsMCQ (Single Correct Answer)
1
Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?
WB JEE 2025
2
The compound that does not give positive test for nitrogen in Lassaigne's test is
WB JEE 2024
3
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
WB JEE 2020
4
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'?
WB JEE 2016