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Chemistry Practice Questions

NCERT Class X Chapter 4: Carbon and its Compounds

Created & Curated By S.K. Sinha

Section A: Questions
Q1.
Carbon exhibits the property of catenation most prominently among all elements due to:
(A) Its tetravalency
(B) Its small size and strong C-C bonds
(C) Its ability to form multiple bonds
(D) All of the above
Q2.
The molecular formula of ethyne is:
(A) C2H4
(B) C2H6
(C) C2H2
(D) CH4
Q3.
Which of the following represents the correct IUPAC name of CH3CH2CH2CH3?
(A) Propane
(B) Butane
(C) Pentane
(D) Hexane
Q4.
The functional group present in alcohols is:
(A) -CHO
(B) -COOH
(C) -OH
(D) -CO-
Q5.
Ethanol reacts with sodium to produce:
(A) Sodium ethoxide and oxygen
(B) Sodium ethoxide and hydrogen
(C) Sodium hydroxide and ethane
(D) No reaction occurs
Q6.
The process of converting ethanol to ethanoic acid is called:
(A) Oxidation
(B) Reduction
(C) Hydration
(D) Dehydration
Q7.
Soaps are sodium or potassium salts of:
(A) Carboxylic acids
(B) Long chain carboxylic acids
(C) Alcohols
(D) Hydrocarbons
Q8.
Which of the following hydrocarbons undergo addition reactions?
(A) C2H6
(B) C3H8
(C) C6H6
(D) C2H4
Q9.
The homologous series is characterized by:
(A) Same functional group
(B) Difference of CH2 unit
(C) Similar chemical properties
(D) All of the above
Q10.
Buckminsterfullerene is an allotrope of:
(A) Phosphorus
(B) Sulphur
(C) Carbon
(D) Silicon
Q11.
The number of hydrogen atoms in a molecule of ethane is:
(A) 4
(B) 6
(C) 8
(D) 2
Q12.
Detergents are better than soaps because:
(A) They work in hard water
(B) They are biodegradable
(C) They are cheaper
(D) They have pleasant smell
Q13.
The structural formula of methanoic acid is:
(A) CH3COOH
(B) HCOOH
(C) C2H5COOH
(D) CH3CHO
Q14.
Which of the following is used as a preservative in pickles?
(A) Acetic acid
(B) Tartic acid
(C) Benzoic acid
(D) Salicylic acid
Q15.
The saturated hydrocarbons are generally:
(A) More reactive
(B) Less reactive
(C) Equally reactive as unsaturated
(D) Unreactive
Q16.
Isomers are compounds that have:
(A) Same molecular formula but different structural formula
(B) Different molecular formula but same structural formula
(C) Same molecular and structural formula
(D) Different molecular and structural formula
Q17.
The gas evolved when ethanoic acid reacts with sodium hydrogencarbonate is:
(A) H2
(B) O2
(C) CO2
(D) CO
Q18.
Diamond is harder than graphite because:
(A) It has a compact structure
(B) It has a 3D network structure
(C) Carbon atoms are sp³ hybridized
(D) All of the above
Q19.
The general formula of alkenes is:
(A) CnH2n+2
(B) CnH2n
(C) CnH2n-2
(D) CnHn
Q20.
Ethanol is converted into ethanoic acid by:
(A) Oxidation with KMnO4
(B) Oxidation with K2Cr2O7
(C) Both (A) and (B)
(D) Reduction
Q21.
The characteristic reaction of carboxylic acids with metals is:
(A) Liberation of CO2
(B) Liberation of H2
(C) Formation of water
(D) No reaction
Q22.
Which of the following is the correct representation of electron dot structure of carbon dioxide?
(A) O=C=O
(B) O-C-O
(C) O≡C-O
(D) O-C≡O
Q23.
The first member of alkyne series is:
(A) Methyne
(B) Ethyne
(C) Propyne
(D) Butyne
Q24.
Ethene molecule contains:
(A) 5 covalent bonds
(B) 6 covalent bonds
(C) 7 covalent bonds
(D) 4 covalent bonds
Q25.
The hardest natural substance is:
(A) Graphite
(B) Diamond
(C) Fullerene
(D) Coal
Section B: Answers
Question Answer
Q1 (D)
Q2 (C)
Q3 (B)
Q4 (C)
Q5 (B)
Q6 (A)
Q7 (B)
Q8 (D)
Q9 (D)
Q10 (C)
Q11 (B)
Q12 (A)
Q13 (B)
Q14 (A)
Q15 (B)
Q16 (A)
Q17 (C)
Q18 (D)
Q19 (B)
Q20 (C)
Q21 (B)
Q22 (A)
Q23 (B)
Q24 (B)
Q25 (B)
Section C: Solutions
Q1.
Small size, strong C-C bonds, tetravalency, and multiple bond formation enable catenation.
Q2.
Ethyne (acetylene) has triple bond: HC≡CH.
Q3.
4 carbon atoms in straight chain = butane.
Q4.
Alcohols contain hydroxyl group (-OH).
Q5.
2C2H5OH + 2Na → 2C2H5ONa + H2
Q6.
Alcohol to carboxylic acid is oxidation reaction.
Q7.
Soaps are salts of long chain fatty acids.
Q8.
Unsaturated hydrocarbons (alkenes, alkynes) undergo addition reactions.
Q9.
Same functional group, CH2 difference, similar properties define homologous series.
Q10.
Buckminsterfullerene (C60) is carbon allotrope.
Q11.
Ethane (C2H6) has 6 hydrogen atoms.
Q12.
Detergents work effectively in hard water unlike soaps.
Q13.
Methanoic acid (formic acid) = HCOOH.
Q14.
Acetic acid (vinegar) preserves pickles by preventing bacterial growth.
Q15.
Saturated hydrocarbons have single bonds, hence less reactive.
Q16.
Isomers: same molecular formula, different structural arrangement.
Q17.
Acid + carbonate → salt + water + CO2.
Q18.
Diamond has 3D tetrahedral structure with sp³ hybridization.
Q19.
Alkenes have one double bond: CnH2n.
Q20.
Both KMnO4 and K2Cr2O7 oxidize ethanol to ethanoic acid.
Q21.
Carboxylic acid + metal → salt + hydrogen gas.
Q22.
CO2 has two double bonds: O=C=O.
Q23.
First alkyne is ethyne (no methyne exists).
Q24.
Ethene (C2H4): 1 C=C + 4 C-H = 6 bonds total.
Q25.
Diamond is hardest natural substance due to 3D network.

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