Podcast
Questions and Answers
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
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 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 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?
Which of the following would weigh the least? (Atomic masses C=12, O=16, Na=23)
Which of the following would weigh the least? (Atomic masses C=12, O=16, Na=23)
The equation below shows the reaction between element 'X' and dilute sulphuric acid.
X(s) + H2SO4 (aq.) --> XSO4 (aq.) + H2(g)
Which particles are responsible for conducting electricity in dilute sulphuric acid and compound XSO4?
The equation below shows the reaction between element 'X' and dilute sulphuric acid.
X(s) + H2SO4 (aq.) --> XSO4 (aq.) + H2(g)
Which particles are responsible for conducting electricity in dilute sulphuric acid and compound XSO4?
Signup and view all the answers
Assertion (A): Dry hydrogen chloride gas is collected by the upward displacement of air.
Reason (R): Hydrogen chloride gas is lighter than air.
Assertion (A): Dry hydrogen chloride gas is collected by the upward displacement of air. Reason (R): Hydrogen chloride gas is lighter than air.
Signup and view all the answers
The structures of four hydrocarbons are shown below:
CH3 C=CH2 H CH3 HC-C-H CH3 HC-C-C=CH2 H3C-C=CH2 CH3 HH
How many isomers of butene are there?
The structures of four hydrocarbons are shown below:
CH3 C=CH2 H CH3 HC-C-H CH3 HC-C-C=CH2 H3C-C=CH2 CH3 HH
How many isomers of butene are there?
Signup and view all the answers
Element 'P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of 'P' is:
Element 'P' has electronic configuration 2,8,8,1. The number of chlorine atoms present in the chloride of 'P' is:
Signup and view all the answers
H2 is an isotope of hydrogen. In the modern periodic table, it will:
H2 is an isotope of hydrogen. In the modern periodic table, it will:
Signup and view all the answers
A nitrate which forms a precipitate with ammonium hydroxide and is also soluble in excess of it:
A nitrate which forms a precipitate with ammonium hydroxide and is also soluble in excess of it:
Signup and view all the answers
Which of the following electronic configurations represents the most electropositive element?
Which of the following electronic configurations represents the most electropositive element?
Signup and view all the answers
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.
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.
Signup and view all the answers
The ratio between the volumes occupied by 4.4 grams of carbon dioxide and 2 grams of hydrogen gas is:
The ratio between the volumes occupied by 4.4 grams of carbon dioxide and 2 grams of hydrogen gas is:
Signup and view all the answers
Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:
Aqueous lead (II) nitrate can be distinguished from aqueous zinc nitrate by adding any of the following solutions in excess, except:
Signup and view all the answers
Which of the following about oxides is correct?
Which of the following about oxides is correct?
Signup and view all the answers
A student takes Cu, Al, Fe, and Zn strips, separately in four test tubes labeled as I, II, III, and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.
(I) (II) (III) (IV)
Cu Al Fe Zn
He would observe a black residue in the test tubes:
A student takes Cu, Al, Fe, and Zn strips, separately in four test tubes labeled as I, II, III, and IV respectively. He adds 10 ml of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case.
(I) (II) (III) (IV) Cu Al Fe Zn
He would observe a black residue in the test tubes:
Signup and view all the answers
Study Notes
ICSE 2025 Chemistry Specimen Paper
- Exam Duration: Two hours
- Maximum Marks: 80
- Instructions: Answers are to be written on separate paper, and there is a 15-minute reading period before writing.
- Sections: Section A is compulsory, attempt any four questions from Section B.
- Intended Marks: Marks for questions and parts of questions are indicated in brackets.
Section A - Multiple Choice Questions
- Instructions: Choose correct answers from given options. Do not copy the question, only write the correct answer.
- Question 1(i): Electrolysis of Copper Sulphate: Electrodes are platinum anode and copper cathode.
- Question 1(ii): Compound P heated with Sodium Hydroxide and turning red litmus paper blue: Copper Sulphate.
- Question 1(iii): Which weighs least: 6.023 x 10^22 atoms of Carbon.
- Question 1(iv): Particles conducting electricity in dilute sulfuric acid and compound XSO4: Both positive and negative ions.
- Question 1(v): Assertion (A): Dry hydrogen chloride gas is collected by upward displacement of air. Reason (R): Hydrogen chloride gas is lighter than air. Answer: Both A and R are true, and R is the correct explanation of A.
- Question 1(vi): Number of isomers of butene: 3
- Question 1(vii): Element P (electronic config. 2,8,8,1) chloride atoms: 1
- Question 1(viii): Isotope H^2 position in the periodic table: Placed after Hydrogen
- Question 1(ix): Nitrate forming a precipitate with ammonium hydroxide: Copper Nitrate.
- Question 1(x): Most electropositive element's electron configuration: 2,8,1
Section B - Short Answer Questions
- Question 3(i): Reaction of Nitric acid with compound Q: Balanced equation needed.
- Question 3(ii): Properties of Sulfuric acid: Explanation of the cases given.
- Question 3(iii): Relative electron affinity and oxidising/electronegativity of elements X & Y: Comparison and their placing in the periodic table.
- Question 3(iv): Preparation of salts (copper sulphate, sodium zincate, ferric chloride): Balanced chemical equations with appropriate chemicals.
- Question 4(i): Aluminium extraction: Other aluminium compound needed for alumina and the reaction at the cathode.
- Question 4(ii): Combining elements M & N: Empirical formula of the compound.
- Question 4(iii): Balanced chemical equations: Various reactions.
- Question 4(iv): Nitric acid production using Ostwald process: Temperature and catalyst, and the reaction equation for Nitrogen dioxide converting to Nitric acid.
- Question 5(i): Ranjana's experiment. Result and reaction equation for ammonia acting as a reducing agent as it passes heated copper oxide.
- Question 5(ii): Identifying alloys: Copper, Zinc & Tin alloy; Lead & Tin alloy.
- Question 5(iii): Identifying salt X, Colorless gas, cation and salt given to Abhishek,
- Question 5(iv): Identification of parts in electrolytic reduction of aluminium.
- Question 6(i): Element X’s group in the periodic table: Justification for the answer.
- Question 6(ii): Two experiments (Experiment 1 & 2): Observations for mixing given solutions.
- Question 7(i): Mixture of Propane and Butane: Total volume of carbon dioxide.
- Question 7(ii): Solutions X, Y and Z, pH values: Solutions reacting with other chemicals and determining which would liberate specific gases.
- Question 7(iii): Calcium nitrate decomposition: Calculating the volume of nitrogen dioxide and the mass of CaO formed.
- Question 8(i): Distinguishing Zinc and Aluminum, Calcium Nitrate, and Lead Nitrate: Reasoning behind the distinctions,
- Question 8(ii): Electron dot diagram for Ammonium ion
- Question 8(iii): Balanced chemical equations: Laboratory preparation of Ethyne from Calcium carbide, Conversion of acetic acid to ethyl acetate, preparation of Nitric acid.
- Question 8(iv): Six organic compounds: Members of the same homologous series, identical pairs of compounds (isomers), chemical equation for preparing F from D.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Prepare for the ICSE 2025 Chemistry examination with this specimen paper. It includes multiple choice questions on key concepts such as electrolysis, chemical reactions, and ion conduction. Test your understanding and practice your exam techniques with questions designed to reflect the actual exam format.
