Chemistry · CBSE

Board exam

2023Class 12Set 56/1/170 marks35 questions

17 of its 35 questions are here. The rest have a figure or are still being checked, so for now they're only in the official PDF.

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Source: CBSE Board Examination 2023, Class 12 Chemistry (043), paper 56/1/1, published by CBSE. CBSE's ZIP of every set

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17 questions

Q1Section A1 mark
$The colligative property used for the determination of molar mass of polymers and proteins is :$
1. A $Osmotic pressure$
2. B $Depression in freezing point$
3. C $Relative lowering in vapour pressure$
4. D $Elevation is boiling point$
Q2Section A1 mark
$Low concentration of oxygen in the blood and tissues of people living at high altitude is due to :$
1. A $high atmospheric pressure$
2. B $low temperature$
3. C $low atmospheric pressure$
4. D $both low temperature and high atmospheric pressure$
Q3Section A1 mark
$The correct cell to represent the following reaction is : Zn + 2Ag⁺ \to Zn²⁺ + 2Ag$
1. A $2Ag | Ag⁺ || Zn | Zn²⁺$
2. B $Ag⁺ | Ag || Zn²⁺ | Zn$
3. C $Ag | Ag⁺ || Zn | Zn²⁺$
4. D $Zn | Zn²⁺ || Ag⁺ | Ag$
Q5Section A1 mark
$Which of the following is affected by catalyst ?$
1. A $ΔH$
2. B $ΔG$
3. C $Ea$
4. D $ΔS$
Q7Section A1 mark
$The most common and stable oxidation state of a Lanthanoid is :$
1. A $+2$
2. B $+3$
3. C $+4$
4. D $+6$
Q8Section A1 mark
$The compounds [Co(SO₄) (NH₃)₅] Br and [Co(Br) (NH₃)₅] SO₄ represent :$
1. A $optical isomerism$
2. B $linkage isomerism$
3. C $ionisation isomerism$
4. D $coordination isomerism$
Q9Section A1 mark
$The synthesis of alkyl fluoride is best obtained from :$
1. A $Free radicals$
2. B $Swartz reaction$
3. C $Sandmeyer reaction$
4. D $Finkelstein reaction$
Q11Section A1 mark
$CH₃CONH₂ on reaction with NaOH and Br₂ in alcoholic medium gives :$
1. A $CH₃COONa$
2. B $CH₃NH₂$
3. C $CH₃CH₂Br$
4. D $CH₃CH₂NH₂$