Kerala Syllabus Class 10 Chemistry Model Question Paper Set 2

Practicing Chemistry Question Paper Class 10 Kerala Syllabus Set 2 English Medium helps identify strengths and weaknesses in a subject.

Chemistry Class 10 Kerala Syllabus Model Question Paper Set 2

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.
The mixture of absolute alcohol and petrol is known as
Answer:
Power alcohol

Question 2.
Find out the relation
Cuprite : Copper
Calamine : …………..
Answer:
Zinc

Question 3.
Liquified ammonia is known as …………..
Answer:
Liquid ammonia

Question 4.
To which block do the actinoides belong to?
Answer:
f – block

Question 5.
Which one contains 2 × 6.022 × 10²³ molecules?
(28 g N₂, 2g H₂, 32g O₂, 44.8 L CO₂)
Answer:
44.8 L CO₂

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

Question 6.
1 GAM nitrogen = 14 g
a) How many moles are present in 140 g of nitrogen (N₂)?
b) How many atoms are present in 140 g of Nitrogen?
Answer:
a) 5 mole
b) 10 mole atom

Question 7.
Complete the table given below.

Compound	Oxidation State of Mn	Sub shell electronic Configuration of Mn ion
Mn O2	+4	(a)
Mn2 O3	(b)	1s2 2s2 2p6 3s2 3p6 3d4

(Hint: Atomic number of Mn = 25, Oxidation state of O = 2)
Answer:
a) 1s² 2s² 2p⁶ 3s² 3p⁶ 3d³
b) +3

Question 8.
Give reason.
a) Magnetic separation is used to concentrate the ore of tin stone.
b) Distillation is the method used for the refining of zinc metal.
Answer:
a) The impurity iron tungstate has magnetic property.
b) Boiling point of zinc is low

Question 9.
a) Which of the given metal doesnot react with dil HCl. (Sodium, Silver, Magnesium, lead)
b) Which is the gas formed when metals react with dilute hydrochloric acid?
Answer:
a) Silver
b) H₂ / Hydrogen

Question 10.
CH₃ – COOH + CH₃ – OH → A + H₂O
a) Write the structural formula of A and complete the equation
b) Name the category of compounds to which A belongs.
Answer:
a) CH₃ – COO – CH₃
b) Ester

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

Question 11.
The process of chemical change taking place in an electrolyte by passing electricity is known as electrolysis.
a) Name the reactions take place at the electrodes, when moltern NaCl (sodium chloride) undergoes electrolysis.
b) What is the charge of anode in an electrolytic cell?
Answer:
a) Cathode : Na⁺ + 1e^– → Na
Anode : 2Cl^– → Cl₂ + 2e
b) Positive

Question 12.
a) Complete the equation given below.
i) CH₃ – CH₂ – CH₃ + Cl₂ → A + HCl
ii) CH₂ – CH = CH₂ + Cl₂ → (B)
b) To which type of reaction does the second equation belong?
Answer:

b) Addition reaction

Question 13.
Name of some ores are given below.
(i) Haematite
(ii) Bauxite
(iii) Calamine
a) Name the ore of iron.
b) Which is the reducing agent used in the extraction of iron from its ore?
c) What is the role of limestone in the extraction of iron?
Answer:
a) Haematite
b) CO/Carbon monoxide
c) For the formation of the flux CaO

Question 14.
Answer the given questions based on the compound. But – 2 – ene
a) What is the molecular formula?
b) Write the structural formula
c) Write the name of an alicyclic compound with same molecular formula.
Answer:
a) C₄ H
b) CH₃ – CH₂ – CH = CH₂
c) Cyclobutane

Question 15.
Take some sugar in a watch glass and add few drops of conc. sulphuric acid to it.
a) What is the observation? Give reason:
b) Which property of sulphuric acid is shown?
Answer:
a) A black / brownish substance is formed.
Sugar is turned to charcol because it absorbs the oxygen and hydrogen in the ratio of water which are the elements in the sugar.
b) Dehydration property

IV. Answer any 4 Questions from 16 to 20. Each carries 4 Score. (4 × 4 = 16)

Question 16.
Electronic configuration of some of the elements are given below. (symbol is not real)
(A) [Ne] 3s² 3p⁵
(B) [Ar] 4 s¹
(C) [Ar] 3d⁵ 4s²
(D) [Ar] 3d¹⁰ 4s² 4p⁵
(a) Which of the elements belong to same group?
(b) Which element shows low ionisation energy?
(c) Which is the transition element among them?
(d) Which element shows only +1 oxidation state?
Answer:
a) A & D / [Ne] 3s² 3p⁵, [Ar] 3d¹⁰ 4s² 4p⁵
b) B / [Ar] 4s¹
c) C / [Ar] 3d⁵ 4s²
d) B / [Ar] 4s¹

Question 17.
A redox reaction is given below.
Fe²⁺ + Mg → Mg²⁺ + Fe
Based on this reaction if we construct a galvanic cell.
(a) Which electrolytes do you choose?
(b) Draw the diagram of the cell?
(c) Write the equation of the chemical reaction takes place at the negative electrode of the cell.
Answer:
a) Fe SO₄, Mg SO₄ / Solution of iron and magnesium

c) Mg → Mg²⁺ + 2e^–

Question 18.
The details of some gases existed at 1 atm pressure and 273 K are given below.
Table
a) Find out ‘A’ and ‘B’?
b) Name the gas law related to this table?
c) If the pressure of oxygen gas doubles at constant temperature. What will the present volume of this gas?
Answer:
a) A – 2 × 6.022 × 10²³ B – 112 L
b) Avogadro law
c) Pressure and volume are inversly proportional to each other
Volume = 11.2 L

Question 19.
The structure of the branched hydrocarbon is given.

a) Write the molecular formula of the compound?
b) How many Carbon atoms are there in the main chain?
c) Write the name of the branches?
d) Write the IUPAC name of the compound.
Answer:
a) C₇ H₁₆
b) 5
c) Methyl
d) 2,3-dimethyl pentane

Question 20.
A system at equilibrium is given…
2 SO₂(g) + O(g) ⇌ 2 SO₃(g) + Heat
(i) Name the catalyst used in this chemical reaction.
(ii) How will the given factors affect the reaction.
a) increases the amount of oxygen.
b) Decreases the pressure
c) Remove SO
Answer:
i) V₂O₅/ Vanadium pentoxide
ii) a) Increases forward reaction
b) Increases backward feaction
c) Increases forward reaction