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Weekly chapter test: CBSE Class 10
Sun 1 Nov – Sat 7 Nov 2026: Carbon and its Compounds (Science), 10 questions. Everyone in CBSE Class 10 gets this test all week; a new chapter comes on Sunday, in turn from the 27 chapters of the class that have a checked question pool.
Questions are written with AI and answer-checked by Shishya; they are not taken from the textbook. Read the chapter page first if you need to.
1. A compound has the molecular formula C₃H₄. To which homologous series does it most likely belong?
2. A student claims that since both methane (CH₄) and carbon tetrachloride (CCl₄) have carbon with four bonds, they should undergo the same type of reactions. Why is this reasoning incorrect?
3. Ethene (C₂H₄) can undergo addition reactions with hydrogen, but ethane (C₂H₆) cannot. Why does this difference exist?
4. An organic compound has 2 carbon atoms and contains the –COOH functional group. Write its molecular formula by counting all atoms present.
5. Ethene (C₂H₄) reacts with hydrogen gas in the presence of nickel catalyst to form ethane (C₂H₆). What type of reaction is this, and why can alkanes not undergo the same reaction?
6. Read the case and answer the question. In a school laboratory in Pune, a student named Arjun investigates the properties of organic compounds. He places a sample of ethane gas in a test tube and burns it with a sufficient supply of air, observing a clean blue flame. He then collects the gases produced and passes them through limewater, which turns milky, and over a cold glass surface, where water droplets form. Next, Arjun takes a sample of ethene gas and passes it through a hot nickel catalyst mixed with hydrogen gas. He observes that the product gas does not decolorize bromine water, unlike the original ethene sample. Finally, he mixes ethanol with ethanoic acid in the presence of a few drops of concentrated sulfuric acid and notices a sweet, fruity smell after heating the mixture. Why did the product gas from the ethene reaction not decolorize bromine water?
7. A student claims that the compound C₅H₁₀ is a saturated hydrocarbon because it contains only carbon and hydrogen. Is this claim correct?
8. Soap molecules have a long hydrocarbon chain and an ionic end. Why does soap fail to work effectively in hard water containing calcium ions?
9. A hydrocarbon has the molecular formula C₃H₄. Based on its hydrogen to carbon ratio, this compound is most likely:
10. Detergents are preferred over soaps for washing clothes in hard water because:
How the score and percentile work
- Your answers are checked on Shishya's server against the answer keys; the explanations show after you submit.
- With a free account, your first try at this week's test is counted: only the number right and the total are kept, under a one-way key instead of your account, with no name. A second try is checked but not counted.
- The percentile compares your counted score with the other counted scores of this week's test only, and shows only once 30 students have been counted. Below that the result says “not enough takers yet”. No ranks, no names, no lists.
- The result card you can share holds the class, the chapter, the week and your score: no name, no school, no account.