Kerala Syllabus Class 10 Chemistry Model Question Paper Set 5

Practicing Chemistry Question Paper Class 10 Kerala Syllabus Set 4 English Medium helps identify strengths and weaknesses in a subject.

Chemistry Class 10 Kerala Syllabus Model Question Paper Set 4

Time: 1½ Hours
Score: 40 Marks

Instructions:

1. First 15 minutes is given as cool of time.
2. This time is to be spent for reading the question paper.
3. Answer according to the instructions
4. Answer the questions considering the score and time.

I. Answer any 4 Questions from 1 to 5. Each carries 1 Score. (4 × 1 = 4)

Question 1.
Find out the sub shell which is not possible
(3d¹⁰, 3s², 2p⁷, 4f⁸),
Answer:
2p⁷

Question 2.
Find out the relation and fill in the blank
Bauxite: Al₂O₃ . 2H₂O
Alumina: ……………….
Answer:
Al₂O₃

Question 3.
Name the process of the industrial manufacturing of sulphuric acid…..
Answer:
Contact process

Question 4.
Name the scientist who proved that the relationship between the pressure and volume.
Answer:
Robert Boyel

Question 5.
Write the structural formula of polyvinyl chloride?
Answer:

II. Answer any 4 Questions from 6 to 10. Each carries 1 Score. (4 × 2 = 8)

Question 6.
The group number of an element ‘Y’ is 15 and it has 3 shells. Then
a) Write the subshell electronic configuration of the element.
b) Write the period number?
Answer:
a) 1s² 2s² 2p⁶ 3s² 3p³
b) Period Number = 3

Question 7.
a) Name the electrolyte used to coat silver on iron nail.
b) Write the equation for the reaction taking place at the anode.
Answer:
a) Silver nitrate solution / silver cynaide + Sodium cynaide solution
b) Ag → Ag⁺ + 1e^–

Question 8.
In the preparation of ammonia in laboratory Calcium Oxide (CaO) is used as drying agent instead of CaO, can sulphuric acid be used as drying agent? Write reason.
Answer:
a) No. Ammonia is basic in nature and sulphuric acid is acidic in nature. So ammonia react with sulphuric acid

Question 9.
C₂H₂, C₃H₄ etc… belong to same homologous series.
a) Write the general formula of this homologous series.
b) if the number of Carbon atoms is 6. What will be the molecular formula of the compound in these series?
Answer:
a) C_n H_{2n – 2}
b) C₆ H₁₀

Question 10.
Find out the gas law related with each of the following instances.
a) The size of the ballon increases as it is inflated.
b) An inflated ballon kept in direct sunlight is found burst
Answer:
a) Avogadro law
b) Charles law

III. Answer any 4 Questions from 11 to 15. Each carries 3 Score: (4 × 3 = 12)

Question 11.
Atomic number of the element X is 25. Its oxides are X₂O₃ and X₂O₅
a) Write down the subshell electronic configuration of ‘X’.
b) What is the oxidation state of X in X₂O₃?
Write the subshell electronic configuration of ‘X’ in these oxide.
Answer:
a) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s²
b) +3, 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁴

Question 12.
a) State Le chateliers principle?
b) Which of the following equilibria is not affected by change in pressure? Why?
(i) 2NO(g) + O₂(g) ⇌ 2NO₂(g)
(ii) N₂(g) + O₂(g) ⇌ 2NO(g)
Answer:
a) When the concentration, pressure or temperature of a system at equilibrium is changed the system will readjust itself so as to nullify the effect of that change and attain a new state of equilibrium
b) N2(g) + O2(g) ⇌ 2 NO(g)
In the case number of molecules of the reactants and products are same.

Question 13.
Analyse the following pictures and answer the following question

a) In which test tube does the chemical change occur? Observe the change.
b) Write the equation for the reaction?
Answer:
a) In the second test tube, the color of solution changes.
b) CuSO₄ + Zn → Zn SO₄ + Cu

Question 14.
a) The steps of the industrial preparation of a substance is given below. Fill in the blanks

b) Which one of the following reacts with ‘B’ to form Ester
[CH₃ – CH₂ – OH, CH₃ – O – CH₃, CH₃ – COOH, CH₃ – CL]
c) Write the structural formula of the ester?
Answer:
a) A – invertase
B – C₂H₅ – OH/Ethanol
b) CH₃ –COOH

Question 15.
Match the following

A Functional group	B General Name
1.- COOH 2. – O – R 3. – OH	a) Ethers b) Alcohol c) Halo groups d) Carboxylic group

Answer:

A Functional group	B General Name
1.- COOH 2.-O-R 3.- OH	d) Carboxylic group a) Ethers b) Alcohol

IV. Answer any 4 Questions from 11 to 15. Each carries 3 Score. (4 × 4 = 16)

Question 16.
The gas SO₂ of volume 112 L occupies at STP
(Atomic mass S = 32, O= 16, N = 14, H = 1)
(a) Calculate the GMM of the given SO₂?
(b) How many number of molecules are there?
(c) Calculate the GMM of NH₃ with the same volume of SO₂ at STP
Answer:
a) No. of moles = 112/_22.4 = 5, 5 mole = GMM
b) 5 × 6.022 × 10²³
c) 5 GMM

Question 17.
To which kind of the reactions does the following belong?
[Addition reaction, Polymerisation, Substitution reaction, Thermal cracking
a) Methane → Chloromethane
b) Propene → Poly propene
c) Hexene → Butene + Ethane
d) Ethene → 1,2-dichloro ethane
Answer:
a) Substitution reaction
b) Polymerisation
c) Thermal cracking
d) Addition reaction

Question 18.

a) Find out A and B
b) Which is the anode of this cell? Write the equation for the anode reaction.
c) What is the charge of cathode in this cell.
Answer:
a) A – Fe, B – Cu
b) Fe, Fe→ Fe²⁺ + 2e^–
c) Positive

Question 19.
Molecular formula of a compound is C₃H₈O.
a) Write the structural formula of the functional isomers.
b) Write the IUPAC name of these two compounds.
Answer:

b) Propan – 2 – ol / Propan – 1 – ol, Methoxy Ethane

Question 20.
The reactions take place at the blast furnacetate given below.

a) Which is the substance deposit in the blast furnace during the manufacturing of iron?
b) Which is the main gangue of the iron ore?
c) Find out the reaction in which the haematite undergoes reduction?
d) What is the role of calcium oxide in the manufacturing of iron?
Answer:
a) Haematite
b) SiO₂/ Silicon dioxide
c) Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂
d) It acts as a flux to remove the gangue SiO₂