Chemistry Past Questions

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4311

The separation technique that is suitable for separating iodine from tetrachloromethane is

A. solvent extraction
B. decantation
C. fractional distillation
D. filtration

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4312

Consider the following reaction equation:
\(2SO_3(g) → 2SO_2(g) + O_2\)(g)
∆H = +198 kJ/mol
Which of the following statements about the reaction is correct?

A. 198 kJ of energy is given off
B. The reaction is exothermic
C. The reaction container would feel warm.
D. 198 kJ of energy is absorbed

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4313

Arrange the following compounds in decreasing order of their boiling points: \(NH_3\), HF, \(SiH_4\), \(CH_4\)

A. HF,\(NH_3\), \(SiH_4\), \(CH_4\)
B. \(CH_4\), \(SiH_4\), HF, \(NH_3\),
C. \(NH_3\),\(CH_4\), \(SiH_4\), HF
D. \(CH_4\), \(SiH_4\), \(NH_3\), HF

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4314

Copper (II) ions are able to participate in co-ordinate covalent bonding because they

A. are coloured
B. are positively charged
C. have vacant d-orbital
D. have unpaired electrons

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4315

What takes place at the cathode during electrolysis?

A. Anions lose electrons
B. Anions are oxidized
C. Cations are oxidized
D. Cations are discharged.

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