An aqueous solution of gas X turns red litmus blue, so it must contain (i)............... (hydrogen/ hydroxyl) ions. When this solution is added in excess to copper sulphate solution, it turns to (ii) ............... (deep blue/ pale blue) solution. Gas X is also a good (iii)...............(oxidising/reducing) agent, which in excess reacts with a greenish-yellow gas to form dense white fumes of (iv) ............... (hydrogen chloride/ammonium chloride).
Answer
An aqueous solution of gas X turns red litmus blue, so it must contain hydroxyl ions. When this solution is added in excess to copper sulphate solution, it turns to deep blue solution. Gas X is also a good reducing agent, which in excess reacts with a greenish-yellow gas to form dense white fumes of ammonium chloride.
Ammonia can convert heated copper oxide to copper. This shows that ammonia is a ............... (reducing agent/oxidising agent).
Answer
Ammonia can convert heated copper oxide to copper. This shows that ammonia is a reducing agent.
The number of hydrogen atoms present in 1 mole of sulphuric acid and 1 mole of sulphurous acid are (X) and (Y), respectively. Relationship between X and Y is ............... (X=Y / cannot compare X and Y).
Answer
The number of hydrogen atoms present in 1 mole of sulphuric acid and 1 mole of sulphurous acid are (X) and (Y), respectively. Relationship between X and Y is X=Y.
Hydrocarbon X decolourises bromine in carbon tetrachloride, and hydrocarbon Y does not decolourise bromine water. Both of the compounds burn with a sooty flame. The molecular formula of X and Y is ............... (C5H12 and C4H8 / C5H8 and C4H10).
Answer
Hydrocarbon X decolourises bromine in carbon tetrachloride, and hydrocarbon Y does not decolourise bromine water. Both of the compounds burn with a sooty flame. The molecular formula of X and Y is C5H8 and C4H10.
The number of chain isomers possible for an alkane with 5 carbon atoms are ............... (3 / 4).
Answer
The number of chain isomers possible for an alkane with 5 carbon atoms are 3.
Cations are ............... (oxidised/ reduced) ions due to the ............... (gain/loss) of electrons by the neutral atom.
Answer
Cations are oxidised ions due to the loss of electrons by the neutral atom.
If a hydrocarbon has the formula of C50H98 , then it is likely to undergo ............... a/an (addition/ substitution) reaction, and the hydrocarbon is a/an ............... (saturated/ unsaturated hydrocarbon).
Answer
If a hydrocarbon has the formula of C50H98, then it is likely to undergo an addition reaction, and the hydrocarbon is an unsaturated hydrocarbon.
The atomic size of Boron is 0.88 A°, and that of nitrogen is 0.70 A°. Nitrogen lies to the ............... (left/ right) of Boron.
Answer
The atomic size of Boron is 0.88 A°, and that of nitrogen is 0.70 A°. Nitrogen lies to the right of Boron.
The ............... (higher/ lower) is the position of the cation in the electrochemical series, the greater the difficulty of it being discharged at the cathode.
Answer
The higher is the position of the cation in the electrochemical series, the greater the difficulty of it being discharged at the cathode.
The correct order of increasing volatility of the acids is ................
(a) HCl < CH3COOH < HNO3
(b) CH3COOH < HCl < HNO3
(c) HNO3 < HCl < CH3COOH
(d) HCl < HNO3< CH3COOH
Answer
The correct order of increasing volatility of the acids is HCl < HNO3 < CH3COOH.
Nikita wanted to gift her friend a decorative piece that is quite hard and strong, doesn’t get corroded and can be polished. She selected a statue that matched her criteria as it was made of an alloy whose main constituent was ................
(a) Cu
(b) Al
(c) Fe
(d) Zn
Answer
Nikita wanted to gift her friend a decorative piece that is quite hard and strong, doesn’t get corroded and can be polished. She selected a statue that matched her criteria as it was made of an alloy whose main constituent was Cu.