ICSEClass 10examsare going on and you have very little time left for theChemistry- Science Paper 2 exam. Therefore,we are providing important questions in this article. You can study these thoroughly and score good marks in your exams.
To help you make your preparation effective, we have compiled a list of important questions with detailed explanations.
These questions forICSE Class 10Chemistry - Science Paper 2exam cover various topics from the syllabus.
ICSE Class 10thChemistry Exam 2025Most Important Questions
Q1. An aqueous solution of copper sulphate turns colourless on electrolysis.
Which of the following could be the electrodes?
P. anode: copper; cathode: copper
Q. anode: platinum; cathode: copper
R. anode: copper; cathode: platinum
(a) only P
(b) only Q
(c) only R
(d) both Q and R
Answer :-(b) only Q
Q2. A compound P is heated in a test tube with sodium hydroxide solution. A red litmus paper held at the mouth of the test tube turns blue.
Which of the following could compound P be?
(a) zinc sulphate
(b) copper sulphate
(c) ferrous sulphate
(d) ammonium sulphate
Answer :-(d) ammonium sulphate
Q3. Which of the following would weigh the least?
(Atomic masses C=12, O=16, Na=23)
(a) 2 gram atoms of oxygen
(b) one mole of sodium
(c) 22.4 litres of carbon dioxide at STP
(d) 6.023 x 1022 atoms of carbon
Answer :-6.023 x 1022 atoms of carbon
Q4. Assertion (A): Dry hydrogen chloride gas is collected by the upward displacement of air.
Reason (R): Hydrogen chloride gas is lighter than air.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer :-(c) A is true but R is false
Q5. Element 'P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of 'P' is:
(a) 2
(b) 1
(c) 3
(d) 4
Answer :-(b) 1
Q6. A nitrate which forms a precipitate with ammonium hydroxide and is also soluble in excess of it:
(a) ferrous nitrate
(b) ferric nitrate
(c) lead nitrate
(d) copper nitrate
Answer :-(d) copper nitrate
Q7. Which of the following electronic configuration represents the most electropositive element?
(a) 2,1
(b) 2,8,1
(c) 2,2
(d) 2, 8, 2
Answer :-(b) 2,8,1
Q8. Assertion (A): Alkali metals do not form dipositive ions.
Reason (R): After loss of one electron alkali metals achieve stable electronic configuration of noble gases.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and are true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer :-(a) Both A and R are true and R is the correct explanation of A
Q9. The ratio between the volumes occupied by 4.4 grams of carbon dioxide and 2 grams of hydrogen gas is:
(a) 2.2:1
(b) 1:2.2
(c) 1:10
(d) 10:1
Answer :-(c) 1:10
Q10. Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solution in excess, except:
(a) aqueous potassium chloride
(b) aqueous sodium sulphate
(c) dilute sulphuric acid
(d) sodium hydroxide solution
Answer :-(d) sodium hydroxide solution
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Q11. Which of the following about oxides is correct?
(a) A basic oxide is an oxide of a non-metal
(b) Acidic oxides contain ionic bonds
(c) Amphoteric oxides contain a metal
(d) Basic oxides are always gases
Answer :-(c) Amphoteric oxides contain a metal
Q12. Match the following Column A with Column B.
| Column A | Column B |
|---|---|
| (a) Aluminium | 1. Covalent compound |
| (b) Sulphuric acid | 2. Carbonate ore |
| (c) Calcination | 3. Hall Heroult’s process |
| (d) Calcium Chloride | 4. Contact Process |
| (e) Carbon tetrachloride | 5. Electrovalent compound |
Answer :-(a) 3, (b) 4, (c) 2, (d) 5, (e) 1
Q13. Complete the following by choosing the correct answers from the bracket:
(a) If an element has one electron in the outermost shell, then it is likely to have the __________ [smallest / largest] atomic size amongst all the elements in the same period.
(b) __________ [sulphuric acid / hydrochloric acid] does not form an acid salt.
(c) A __________ [reddish brown / dirty green] coloured precipitate is formed when ammonium hydroxide is added to a solution of ferrous chloride.
(d) Alkynes undergo __________ [addition / substitution] reactions.
(e) An __________ [alkaline / acidic] solution will turn methyl orange solution pink or red.
Answer :-(a) largest, (b) hydrochloric acid, (c) dirty green, (d) addition, (e) acidic
Q14. A bond formed between two atoms by sharing of a pair of electrons, with both electrons being provided by the same atom.
Answer :-Coordinate bond
Q15. A salt formed by the complete neutralization of an acid by a base.
Answer :-Normal salt
Q16. A reaction in which the hydrogen of an alkane is replaced by a halogen.
Answer :-Substitution
Q17. The energy required to remove an electron from a neutral gaseous atom.
Answer :-ionisation potential
Q18. A homogenous mixture of two or more metals or a metal and a non-metal in a definite proportion in their molten state.
Answer :- alloy
Q19. What property of Sulphuric acid is exhibited in each of the following cases:
(a) In the preparation of HCl gas when it reacts with Sodium chloride.
(b) When concentrated Sulphuric acid reacts with Copper to produce Sulphur dioxide gas.
Answer :-(a) Non volatile property, (b) Oxidising property
Q20. The electron affinity of an element X is greater than that of element Y.
(a) How is the oxidising power of X likely to compare with that of Y?
(b) How is the electronegativity of X likely to compare with that of Y?
(c) State whether X is likely to be placed to the left or to the right of Y in the periodic table?
Answer :-(a) X has more oxidising power than Y
(b) X will be more electronegative than Y
(c) X will be placed to the right of Y
Q21.Ranjana wants to prove that ammonia is a reducing agent. To demonstrate this, she passes ammonia gas over heated copper oxide. What will she observe?
Answer :-Black copper oxide changes to reddish brown / pink copper
Q22. Name the alloy which is made up of:
(a) Copper, Zinc and Tin
(b) Lead and Tin
Answer :-(a) Bronze, (b) Solder
Q23. Abhishek was given a salt 'X' which was white in colour for analysis. On strong heating it produced a yellow residue, a colourless gas and also a reddish-brown gas. The solution of the salt 'X' when tested with excess of ammonium hydroxide produced a chalky white insoluble precipitate.
(a) Name the coloured gas evolved when Abhishek heated the salt strongly.
(b) Which cation was present in the sample given to Abhishek?
(c) Identify the salt given to Abhishek for analysis.
Answer :-(a) Nitrogen dioxide, (b) Lead ions, (c) Lead nitrate
Q24. Rohit has solution X, Y and Z that has pH 2, 7 and 13 respectively.
Which solution.
(a) will liberate sulphur dioxide gas when heated with sodium sulphite
(b) will liberate ammonia gas when reacted with ammonium chloride
(c) will not have any effect on litmus paper?
Answer :-(a) X, (b) Y, (c) Z
Q25. State giving reasons if:
(a) zinc and aluminium can be distinguished by heating the metal powder with concentrated sodium hydroxide solution.
(b) calcium nitrate and lead nitrate can be distinguished by adding ammonium hydroxide solution to the salt solution.
Answer :-(a) No, both will form a white ppt which is soluble in excess of sodium hydroxide
(b) Yes, white ppt. will be formed with lead nitrate but no ppt. is formed with calcium nitrate/ or no visible reaction
