Carbon & its Compounds: Class 10 Previous Year Questions

Carbon & its Compounds questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. Attempt either (a) or (b) : (a) A carbon compound ‘P’ of molecular formula C2H6O is found to be neutral when tested with red and blue litmus. A gas that burns with a pop sound is produced when sodium metal reacts with compound ‘P’. (i) Identify the compound ‘P…
   Board 20263 marksshort answer
2. Assertion (A) : In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.
   Board 20261 markAssertion-Reason
3. Assertion (A) : Carbon shares its valence electrons with other atoms of carbon or with atoms of other elements. Reason (R) : The shared electrons belong to the outermost shells of both the atoms and lead to both atoms attaining the noble gas configuration. Pag…
   Board 20262 marksAssertion-Reason
4. Assertion (A) : Blood plasma transports carbon dioxide in dissolved form, while oxygen is transported by respiratory pigments. Reason (R) : Carbon dioxide is more soluble in water than in oxygen.
   Board 20261 markAssertion-Reason
5. Give reasons for the following : 29. (i) (a) () Covalent compounds are poor conductor of electricity. (I) Soap does not form lather in hard water. (IlI) Carbon shows catenation but silicon does not. Write chemical equations for the following : (ii) 2 () Oxidat…
   Board 20263 marksshort answer
6. Assertion (A) : Carbon compounds can form chains, branched and ring structures. Reason (R) : Carbon exhibits the property of catenation.
   Board 20262 marksAssertion-Reason
7. The formula of functional group for aldehyde is : (A) -COOH (B) -CHO (C) -C- (D) -OH
   Board 20261 markMCQ
8. Identify from the following a group containing all non-biodegradable substances. (A) Leather, Glass, Plastic (B) Cotton, Wood, Nylon (C) DDT, Polyester, Glass (D) Leather, Silk, Wool.
   Board 20251 markAssertion-Reason
9. (a) (i) Draw two isomeric structures of Butene (C4H8). (ii) Name the following compounds : (I) l H H H H – C – C – C – C H H H       (II) H H H – C – C – C – C – H H O H H H        (iii) Write the chemical equations for the following reactions. M…
   Board 20255 markslong answer
10. (a) (i) A compound ‘X’ having two carbon atoms in its molecule turns blue litmus red and 5 – 8% solution of ‘X’ in water is widely used as a preservative. Identify the compound ‘X’ and write its structure. 1 1 2 (ii) Compare its pH nature with a mineral acid. …
    Board 20255 markslong answer
11. Seawater contains many salts dissolved in it. Common salt is separated from these salts. Deposits of solid salt are also found in several parts of the world. These large crystals are often brown due to impurities. This is called rock salt and is mined like coa…
    Board 20254 marksshort answer
12. (a) (i) Give reason why carbon can neither form C4+ cations nor C4- anions but form covalent compounds. (i) What is homologous series of carbon compound ? Write the molecular formula of any two consecutive members of homologous series of aldehydes. (ii) Draw t…
    Board 20245 markslong answer
13. Define a homologous series of carbon compounds. 34. (A) (i) (i) Why is the melting and boiling points of CHg higher than that of CH or C2H4 ? (ii) Why do we NOT see any gradation in chemical properties of a homologous series compounds ? (iv) Write the name and…
    Board 20245 markslong answer
14. Consider the following statements about homologous series of carbon compounds : (a) All succeeding members differ by - CH, unit. (b) Melting point and boiling point increases with increasing molecular mass. (c) The difference in molecular masses between two su…
    Board 20241 markMCQ
15. Carbon compounds : (i) are good conductors of electricity. (i) are bad conductors of electricity. (ii) have strong forces of attraction between their molecules. (iv) have weak forces of attraction between their molecules. The correct statements are : (a) (i) a…
    Board 20241 markMCQ
16. (a) A saturated organic compound·A'belongs to the homologous series of alcohols. On heating 'A' with concentrated sulphuric acid at 443 K, it forms an unsaturated compound ·B' with molecular mass 28 u. The compound ·B' on addition of one mole of hydrogen in th…
    Board 20235 markslong answer
17. H 19 H 34. (a) he presence ium ethanoate. Write the chemical equation for the reaction involved and name it, giving justification for the name. 5 OR H 20 H (I) (i) -{~ÝXþ g§aMZm It{ME & Bg `m¡{JH$ _| CnpñWV Am~ÝYm| H$m àH$ma ? (ii) X¡{ZH$ OrdZ _| BªYZ Ho$ ê$n …
    Board 20235 markslong answer
18. In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the solution 'X' the solution 'X' first turns milky and then colourless. Dilute Hydrochloric Acid Sodium carbonate The option that justifies the above sta…
    Board 20231 markMCQ
19. Consider the structures of the three cyclic carbon compounds A, B and C given below and select the correct option from the following : H- (A) (B) H- H- (C) (a) Aand C are isomers of hexane and Bis benzene. (b) Ais an isomer of hexane, B is benzene and Cis an i…
    Board 20231 markMCQ
20. During vigorous exercise, the occurrence of cramps in the outer muscles of an athlete is due to the conversion of pyruvate to : (a) Glucose (b) Ethanol (c) Lactic acid (d) Lactose
    Board 20231 markMCQ

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