Kerala SSLC Chemistry Question Paper March 2023 with Answers English Medium

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Kerala Syllabus Class 10 Chemistry Question Paper March 2023 with Answers English Medium

Time: 1½ Hours
Total Score: 40

Instructions:

• The first 15 minutes is cool-off time.
• You may use this time to read the questions and plan your answers.
• Answer only based on instructions and questions given.
• Consider score and time while answering.

Section – A

Answer any 4 questions from 1 to 5. Each question carries 1 score. (4 × 1 = 4)

Question 1.
The monomer of Polyvinyl Chloride is ____________ (1)
Answer:
Vinyl Chloride

Question 2.
In an atom, four electrons are present in the p sub-shell of its M shell. How is it represented? (1)
[2p⁴, 4p⁴, 3p⁴, 5p⁴]
Answer:
3p4

Question 3.
Find the relation and fill up: (1)
C_nH_2n+2: Alkane
C_nH_2n-2: ______________
Answer:
C_nH_2n-2: Alkyne

Question 4.
Phenolphthalein is pink in colour in the solution of ammonia in water. This shows that ammonia is ____________ in nature. (1)
Answer:
Basic

Question 5.
Which is the electrolyte used in electroplating copper on an iron ring? (1)
[FeSO₄, AgNO₃, ZnSO₄, CuSO₄]
Answer:
CuSO₄

Section – B

Answer any four questions from 6 to 10. Each question carries 2 scores.

Question 6.
Choose the suitable method used in each of the following processes from the bracket.
[Liquation, Leaching, Froth floatation, Distillation]
(a) Concentration of sulphide ores. (1)
(b) Refining of metals with low boiling points. (1)
Answer:
(a) Froth Floatation
(b) Distillation

Question 7.
(a) How much GMM is present in 90 g water [H₂O]? (1)
(b) Find the number of molecules present in it. (1)
[Hint: Molecular mass of water = 18]
Answer:
(a) \(\frac{90}{18}\) = 5
(b) 5 × 6.022 × 10²³

Question 8.
Ethanol is an alcohol which is extensively used for industrial purposes.
(a) What is rectified spirit? (1)
(b) How does rectified spirit differ from absolute alcohol? (1)
Answer:
(a) Rectified spirit is 95.6% pure ethanol. It is obtained by the fractional distillation of wash.
(b) Absolute alcohol is 99.5% pure ethanol. It is obtained by the fractional distillation of rectified spirit.

Question 9.
Concentrated ores are converted into their oxides by two processes.
(a) Name of the process carried out in the presence of air is ____________ (1)
(b) Which process is used in the case of carbonate ore? (1)
Answer:
(a) Roasting
(b) Calcination

Question 10.
Concentrated sulphuric acid forms nitric acid in reaction with nitrates. The chemical equation of this reaction is given below.
NaNO₃ + H₂SO₄ → NaHSO₄ + HNO₃
(a) Which sodium salt is used to get hydrochloric acid [HCl] in the same manner? (1)
(b) Write down the chemical equation of this reaction. (1)
Answer:
(a) NaCl
(b) 2NaCl + H₂SO₄ → Na₂SO₄ + 2HCl

Section – C

Answer any four questions from 11 to 15. Each question carries 3 scores.

Question 11.
Subshell electronic configurations of a few elements are given. One of them is a noble gas. [Symbols are not real]
P – 1s² 2s² 2p⁶
Q – 1s² 2s² 2p⁵
R – 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²
S – 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
Answer the following questions.
(a) Which element has the highest Ionisation Energy? (1)
(b) Which element belongs to s-block? (1)
(c) Which element shows a variable oxidation state? (1)
Answer:
(a) P = 1s² 2s² 2p⁶
(b) S = 1s² 2s² 2p² 3s² 3p⁶ 4s²
(c) R = 1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²

Question 12.
Observe the figure.
Metals rods are dipped in salt solutions taken in three beakers.

(a) In which beaker does the displacement reaction take place? Give reason. (2)
(b) Write down the chemical equation of the oxidation reaction taking place in this beaker. (1)
[Hint: Order of reactivity Zn > Cu > Ag]
Answer:
(a) Beaker A.
Zn is more reactive than Cu. So Zn will displace Cu from the CuSO₄ solution.
(b) Zn → Zn²⁺ + 2e^–

Question 13.
Chemical equations of the reactions taking place in blast furnaces during the industrial production of iron are given below.
(i) C + O₂ → CO₂ + Heat
(ii) CO₂ + C + Heat → 2CO
(iii) Fe₂O₃ + 3CO → 2Fe + 3CO₂
(iv) CaCO₃ → CaO + CO₂
(v) CaO + SiO₂ → CaSiO₃
Answer the following questions.
(a) Which compound acts as the reducing agent? (1)
(b) What is the function of CaO in the production of iron? (1)
(c) Which is the slag formed here? (1)
Answer:
(a) CO
(b) CaO acts as a flux in the manufacture of iron.
(c) CaSiO₃

Question 14.
The structural formula of an organic compound is given.
CH₃ – CH₂ – CH = CH₂
(a) Write down the IUPAC name of this compound. (1)
(b) What is its molecular formula? (1)
(c) What is the molecular formula of the adjacent homologue coming after it? (1)
Answer:
(a) But-1-ene
(b) C₄H₈
(c) C₅H₁₀

Question 15.
Complete the table using the names of reactions given in the box. (3)

Answer:
(a) Addition Reaction
(b) Substitution Reaction
(c) Combustion

Section – D

Answer any 4 questions from 16 to 20. Each question carries 4 scores.

Question 16.
The atomic number of element X is 8.
(a) Write the subshell electronic configuration of X. (1)
(b) Find its group number and period number. (1)
(c) Write the chemical formula of the compound formed when element X reacts with Aluminium (Al). (2)
[Hint: Valency of Al = 3]
Answer:
(a) ₈X = 1s² 2s² 2p⁴
(b) Group = 16, Period = 2

Question 17.
The data given in the table shows the relation between the volume and temperature of a definite mass of gas. [Pressure is kept constant]

(a) Find ‘x’ and ‘y’. (2)
(b) Which gas law is applied here? (1)
(c) If An inflated balloon is kept in Sunlight, it will burst. Given reason. (1)
Answer:
(a) x = \(\frac{600}{300}\) = 2
y = \(\frac{800}{400}\) = 2
(b) Charle’s Law
(c) When temperature increases the volume of air inside the balloon increases. So it bursts.

Question 18.
The given diagram represents a galvanic cell.
[Hint: Order of reactivity: Mg > Cu]

(a) What is the energy change taking place in galvanic cells? (1)
(b) At which electrode does oxidation take place in galvanic cells? (1)
(c) Identify the cathode in the given cell. (1)
(d) Write down the chemical equation of the reaction taking place at the cathode in the given cell.
Answer:
(a) Chemical energy is converted into electrical energy.
(b) At anode. Here Mg rod
(c) Cu rod
(d) Cu²⁺ + 2e^– → Cu

Question 19.
The reversible reaction at equilibrium is given.
2NO (g) + O₂ (g) \(\rightleftharpoons\) 2NO₂ (g) + Heat
Answer the following:
(a) How does an increase in temperature influence the amount of product formed? (1)
(b) What change is to be made in pressure to get more product? (1)
(c) How does an increase in concentration of oxygen influence the rate of forward reaction? (1)
(d) What is the function of a catalyst in reversible reactions? (1)
Answer:
(a) When temperature increases the amount of product decreases. Because the forward reaction is exothermic.
(b) Due to forward reaction number of molecules decreases. So to get more product pressure should be increased.
(c) When the concentration of oxygen increases the amount of product increases.
(d) Catalyst speeds up both forward and backward reactions. So equilibrium is attained earlier.

Question 20.
Examine the organic compounds given below.
(i) CH₃ – CH₂ – CH₂ – CH₂ – CH₃
(ii) CH₃ – CH₂ – CH₂ – OH
(iii) CH₃ – CH₂ – CH₂ – Cl
(iv) CH₃ – CH₂ – O – CH₃

(a) Identify the isomeric pairs. (3)
(b) Which is the functional isomer pair? (2)
Answer: