ISC Class 12 Chemistry Sample Paper. Sample papers and question papers for ICSE and ISC students. These question papers have been collected by the best teachers from ICSE and ISC schools. Students should download and practice these papers to gain better marks in examinations.
PART I
Question 1.(a) Fill in the blanks by choosing the appropriate word/words from those given in brackets:
(electron, proton, neutron, decreases, increasing, lowering, one, two, acidic, basic, anion, cation, paramagnetic, Lewis acid, Lewis base, carbonic acid, sulphurous acid, sulphuric acid, ammonium carbonate, sodium bicarbonate, six, increases)
(i) A positive catalyst _______ the rate of a reaction by _____ the activation energy.
(ii) Human blood is a buffer solution of _________ and _________.
(iii) BF3 is a _________ since it is an _________ deficient molecule.
(iv) Oxygen is ________ due to the presence of ______ unpaired electrons.
(v) A solution of FeCl3 is ________ due to ________ hydrolysis.
(b) Complete the following statements by selecting the correct alternative from the choices given:
(i) [Co(NH3)5Br] SO4 and [Co(NH3)5SO4] Br exhibit
1. Coordination isomerism.
2. Ionisation isomerism.
3. Hydrate isomerism.
4. Geometrical isomerism.
(ii) Cannizzaros’ reaction is given by:
1. Formaldehyde.
2. Acetaldehyde.
3. Acetone.
4. Ethanol.
(iii) Out of the following solutions, the one having the highest boiling point will be:
1. 0.01 M Na2SO4.
2. 0.01 M KNO3 .
3. 0.01 M Urea.
4. 0.01 M Glucose.
(iv) The bond angle of water is:
1. 90°
2. 105°
3. 107.3°
4. 120°
(v) The co-ordination number of each ion in copper crystals is:
1. 4
2. 12
3. 14
4. 8
(c) Answer the following questions:
(i) The depression of freezing point caused by a 1M NaCl solution is 0.0123°C. What will be the depression of freezing point caused by a 1 M glucose solution?
(ii) What happens to the pH of a solution containing equimolar amount of acetic acid and sodium acetate when a few drops of dilute HCl is added? Give reason.
(iii) Express the relationship between molar conductivity and specific conductivity of a solution. What is the unit of molar conductivity?
(iv) Give the electrode reactions of the galvanic cell in which the reaction
Zn(s) + 2 Ag+ (aq) → Zn+2(aq) + 2 Ag(s) takes place.
(v) How is the free energy change related to the enthalpy and entropy change of a substance?
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