ICSE Class 10 Chemistry · Competency Practice · 11 solved questions
Exercise
Marks
391 Mark · Fill in the blanks
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).
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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.
401 Mark · Fill in the blanks
Ammonia can convert heated copper oxide to copper. This shows that ammonia is a ............... (reducing agent/oxidising agent).
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Ammonia can convert heated copper oxide to copper. This shows that ammonia is a reducing agent.
411 Mark · Fill in the blanks
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).
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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.
421 Mark · Fill in the blanks
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).
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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.
431 Mark · Fill in the blanks
The number of chain isomers possible for an alkane with 5 carbon atoms are ............... (3 / 4).
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The number of chain isomers possible for an alkane with 5 carbon atoms are 3.
441 Mark · Fill in the blanks
Cations are ............... (oxidised/ reduced) ions due to the ............... (gain/loss) of electrons by the neutral atom.
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Cations are oxidised ions due to the loss of electrons by the neutral atom.
451 Mark · Fill in the blanks
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).
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If a hydrocarbon has the formula of C50H98, then it is likely to undergo an addition reaction, and the hydrocarbon is an unsaturated hydrocarbon.
461 Mark · Fill in the blanks
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.
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The atomic size of Boron is 0.88 A°, and that of nitrogen is 0.70 A°. Nitrogen lies to the right of Boron.
471 Mark · Fill in the blanks
The ............... (higher/ lower) is the position of the cation in the electrochemical series, the greater the difficulty of it being discharged at the cathode.
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The higher is the position of the cation in the electrochemical series, the greater the difficulty of it being discharged at the cathode.
481 Mark · Fill in the blanks
The correct order of increasing volatility of the acids is ................
The correct order of increasing volatility of the acids is HCl < HNO3 < CH3COOH.
491 Mark · Fill in the blanks
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
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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.