Kerala SSLC Chemistry Board Model Paper March 2024 with Answers English Medium

Students can read Kerala SSLC Chemistry Board Model Paper March 2024 with Answers English Medium and Kerala SSLC Chemistry Previous Year Question Papers with Answers helps you to score more marks in your examinations.

Kerala Syllabus Class 10 Chemistry Board Model Paper March 2024 with Answers English Medium

Time: 1½ Hours
Total Score: 40

Instructions:

• The first 15 minutes is cool-off time.
• You may use the 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 four questions from 1 to 5. Each question carries 1 score.

Question 1.
Which of the following subshells is not possible? (1)
(3f, 3d, 3p, 4f)
Answer:
3f

Question 2.
Which product is obtained at the cathode when molten sodium chloride is electrolyzed? (1)
Answer:
Sodium

Question 3.
The highly concentrated aqueous solution of ammonia is known as __________ (1)
Answer:
Liquor Ammonia

Question 4.
Write the general name of the compounds having a carboxylic (-COOH) functional group. (1)
Answer:
Carboxylic Acids (RCOOH)

Question 5.
State Boyle’s Law. (1)
Answer:
At a constant temperature, the volume of a definite mass of gas is inversely proportional to its pressure.
If P is the pressure and V is the volume, then P × V is a constant.

Section – B

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

Question 6.
Select the correct statements regarding gases from the following. (2)
(a) The real volume of gas molecules is much less when compared to the total volume of the gas.
(b) The gas molecules move in one direction only.
(c) The gas molecules are in random motion in all directions.
(d) The collisions of gas molecules are inelastic.
Answer:
(a) The real volume of gas molecules is much less when compared to the total volume of the gas.
(c) The gas molecules are in random motion in all directions.

Question 7.
A glass rod dipped in concentrated hydrochloric acid (conc. HCl) when shown over ammonia gas, thick white fumes are formed.
(a) Which is the compound formed in this experiment? (1)
(b) Write the chemical equation of the formation of this compound. (1)
Answer:
(a) Ammonium Chloride (NH₄Cl)
(b) NH₃ + HCl → NH₄Cl

Question 8.
Write the IUPAC names of the following compounds.
(a) CH₃ – CH₂Cl (1)
(b) CH₃ – CH₂ – O – CH₃ (1)
Answer:
(a) Chloro Ethane
(b) Methoxy Ethane

Question 9.
Analyse the following equation which shows the fermentation of molasses.

(a) Identify the ‘Enzyme A’. (1)
(b) Which is the product obtained when was is subjected to fractional distillation? (1)
Answer:
(a) Zymase
(b) Rectified Spirit

Question 10.
(a) Which method is used to purify zinc metal? (1)
(b) Which property of zinc is utilized here? (1)
Answer:
(a) Distillation
(b) Low boiling Point

Section – C

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

Question 11.
The given table shows the results of an experiment on a fixed mass of gas at constant pressure.

(a) Identify the gas law represented by this table. (1)
(b) Write any one situation in daily life to which this can be related. (1)
(c) Find the volume of this gas at 100 K. (1)
Answer:
(a) Charles Law
(b) If an inflated balloon is kept in sunlight, it will burst.
(When temperature increases, the volume of the air inside the balloon increases.)
(c) According to Charles’s law, at constant pressure, \(\frac{V}{T}\) is a constant.
\(\frac{V}{T}\) = 0.03
When T = 100 K
\(\frac{V}{100K}\) = 0.03
V = 0.03 × 100 = 3 L
The volume of the gas at 100 K is 3 L.

Question 12.
A copper plate is dipped in AgNO₃ solution and kept for some time.
(a) Write any two observations concerning this reaction that takes place here. (2)
(b) Write the reason for the change that occurred in the solution. (1)
Answer:
(a) Silver is deposited on the copper plate, and the silver nitrate solution turns blue.
(b) Displacement Reaction.

Question 13.
Subshell electronic configurations of two elements are given. [Symbols are not real]
X – [Ne] 3s² 3p¹
Y – [Ne] 3s² 3p⁵
(a) Find the groups of X and Y. (1)
(b) What is the valency of Y? (1)
(c) Write the chemical formula of the compound formed by the combination of X and Y. (1)
Answer:
(a) X = 13, Y = 17
(b) 1
(c) XY₃

Question 14.
(a) Starting from ethene (CH₂ = CH₂) how will you prepare the following compounds? Write the chemical equation of each reaction.
(i) CH₃ – CH₃ (1)
(ii) CH₃ – CH₂Cl (1)
(b) Which reaction is used to get polythene from ethene? (1)
Answer:
(a) (i) CH₂ = CH₂ + H₂ → CH₃ – CH₃
(ii) CH₂ = CH₂ + HCl → CH₃ – CH₂Cl
(b) Polymerisation

Question 15.
The structural formula of an organic compound is given.
CH₃ – CH₂ – CH = CH₂
(a) This compound belongs to ___________ family. (1)
(alkane, alkene, alkyne)
(b) Write the molecular formula and IUPAC name of this compound. (1)
(c) Write the structural formula of the alicyclic compound with the same molecular formula of the above-given compound. (1)
Answer:
(a) Alkene
(b) IUPAC Name – But-1-ene
Molecular formula – C₄H₈

Section – D

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

Question 16.
Analyze the given equation for the main step in the manufacture of Sulphuric acid.
2SO₂ + O₂ \(\rightleftharpoons\) 2SO₃ + Heat
(a) Write the name of the process used for the manufacture of sulphuric acid. (1)
(b) Which is the catalyst used in the manufacture of Sulphuric acid? (1)
(c) What is the effect of the following changes in the amount of SO₃ produced?
(i) More oxygen is added. (1)
(ii) Pressure is increased. (1)
Answer:
(a) Contact Process
(b) Vanadium Pentoxide (V₂O₅)
(c) (i) Forward reaction increases, and more product is formed.
(Concentration of reactant is increased, more amount is formed, rate of forward reaction increases)
(ii) Forward reaction increases, and more product is formed.
(When pressure increases, the reaction in which there is a decrease in no. of moles is favored)

Question 17.
The compound ‘A’ added to the blast furnace decomposes to give a product ‘B’ which acts as the flux in the production of Iron.
(a) Identify the compounds A and B. (2)
(b) Write the equation of slag formation in a blast furnace. (1)
(c) Which is the compound acting as the reducing agent in the blast furnace? (1)
Answer:
(a) A = Calcium Carbonate (CaCO₃)
B = Calcium Oxide (CaO)
(b) CaO + SiO₂ → CaSiO₃
(c) Carbon Monoxide

Question 18.
In a metal ‘M’ reaction with chlorine at different conditions, two compounds MCl₂ and MCl₃ are formed.
(a) Find the oxidation states of M in each of these compounds. (1)
(b) If the 3d subshell of this metal contains 6 electrons, write the complete subshell electronic configuration of this metal atom. (1)
(c) Write the subshell electronic configuration of the metal ion in MCl₂. (1)
(d) Write any one property of the elements in the block to which this metal belongs. (1)
Answer:
(a) MCl₂ – +2, MCl₃ – +3
(b) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²
(c) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶
(The oxidation state of that metal is +2, and 2 electrons are donated)
(d) Coloured Compounds/Different Oxidation State

Question 19.
An organic compound with -OH as the functional group has the molecular formula C₃H₈O.
(a) Write two possible structural formulae of this compound. (2)
(b) Write the structure and IUPAC name of a functional isomer of the above compounds. (2)
Answer:
(a)

and CH₃ – CH₂ – CH₂ – OH
(b) CH₃ – CH₂ – O – CH₃
IUPAC Name – Methoxy Ethane

Question 20.
Observe the following figures.

(a) In which of these beakers does a chemical reaction take place? (1)
(b) Write the chemical equation of the reaction. (1)
(c) How will you construct a galvanic cell using the materials provided in the beakers? Draw the figure of the galvanic cell and explain.
Answer:
(a) Beaker A
(b) Zn + CuSO₄ → ZnSO₄ + Cu
(c)

A galvanic cell or voltaic cell is an arrangement in which chemical energy is converted into electrical energy using a redox reaction. Arrange the apparatus as shown in the picture. Take two beakers, one containing 100 mL ZnSO₄ solution and the second containing the same amount of CuSO₄ solution with the same concentration. Dip Zn rod in ZnSO₄ solution and Cu rod in CuSO₄ solution. Connect the negative terminal of the voltmeter to the Zn rod and the positive terminal to the Cu rod. Connect the two solutions in the beakers using a salt bridge (A long filter paper that is moistened with KCl solution can be used instead of a salt bridge).