Chemistry
The observation when ammonium salt reacts with caustic soda:
- A reddish brown gas
- A colourless gas which gives dense white fumes with conc. HCI
- A green coloured gas which turns moist blue litmus paper red.
- A colourless gas which turns lime water milky.
Answer
A colourless gas which gives dense white fumes with conc. HCI
Reason — When caustic soda (sodium hydroxide) is heated with an ammonium salt, ammonia gas (NH3) is evolved. Ammonia is colourless, has a pungent smell, turns damp red litmus blue, and produces dense white fumes of ammonium chloride (NH4Cl) when it comes in contact with concentrated hydrochloric acid.
Related Questions
Identify one statement that does not hold true for electrorefining of copper:
- Electrolyte is acidified CuSO4 solution
- Cathode is a thin strip of impure copper
- Anode dissolves in the electrolyte
- Anode gets thicker.
A compound with Empirical formula XY2, has vapour density equal to its empirical formula weight, its molecular formula is:
- XY2
- X3Y6
- X2Y4
- X6H12
Fused alumina is reduced to aluminium by electrolytic reduction, since:
- alumina is highly stable.
- alumina is least stable.
- alumina is not reduced by drying agents.
- alumina is not reduced by reducing agents.
Assertion (A): Addition reaction is a characteristic property of alkenes
Reason (R): Alkenes are double bond compounds.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.