CBSE Class 10 Science Carbon and its compound Sure Shot Questions Set 04

Question. Which of the following hydrocarbons does not decolourise bromine water?
(a) \( C_{10}H_{22} \)
(b) \( C_6H_{12} \)
(c) \( C_{10}H_{18} \)
(d) \( C_{10}H_{20} \)
Answer: (a) \( C_{10}H_{22} \)

Question. 2-Methylbut-2-ene will be represented as
(a) \( CH_3 – CH – CH_2CH_3 \) (with \( CH_3 \) branch on CH)
(b) \( CH_3 – C(CH_3) = CH – CH_3 \)
(c) \( CH_3 – CH_2 – C(CH_3) = CH_2 \)
(d) \( CH_3 – CH(CH_3) – CH = CH_2 \)
Answer: (b) \( CH_3 – C(CH_3) = CH – CH_3 \)

Question. The substance that would not at all be formed during the reaction of methane and chlorine in presence of sunlight is
(a) \( CH_3Cl \)
(b) \( CHCl_3 \)
(c) \( CH_3CH_2CH_3 \)
(d) \( CH_2Cl_2 \)
Answer: (c) \( CH_3CH_2CH_3 \)

Question. The following reaction is an example of \( CH_4 + 2O_2 \rightarrow CO_2 + 2H_2O + heat + light \)
(a) addition reaction
(b) substitution reaction
(c) combustion reaction
(d) displacement reaction
Answer: (c) combustion reaction

Question. When methane is burnt in an excess of air, the products of combustion are
(a) C and \( H_2O \)
(b) CO and \( H_2O \)
(c) \( CO_2 \) and \( H_2 \)
(d) \( CO_2 \) and \( H_2O \)
Answer: (d) \( CO_2 \) and \( H_2O \)

Question. The number of oxygen molecules used in the combustion of 1 molecule of ethanol is
(a) 1
(b) 2
(c) 3
(d) 4
Answer: (c) 3

Question. Saturated hydrocarbons on combustion gives
(a) Sooty flame
(b) Non-sooty flame
(c) Oxygen
(d) Carbon monoxide
Answer: (b) Non-sooty flame

Question. An organic compound X with molecular formula \( C_2H_4O_2 \) turns blue litmus red and gives brisk effervescence with sodium bicarbonate. Identify the compound.
(a) Methanoic acid
(b) Ethanoic acid
(c) Propanoic acid
(d) Butanoic acid
Answer: (b) Ethanoic acid

Question. When ethanoic acid is heated with \( NaHCO_3 \) the gas evolved is
(a) \( H_2 \)
(b) \( CO_2 \)
(c) \( CH_4 \)
(d) \( CO \)
Answer: (b) \( CO_2 \)

Question. Glacial acetic acid is
(a) frozen acetic acid
(b) 5–8% solution of acetic acid
(c) mixture of acetic acid and alcohol
(d) None of the options
Answer: (a) frozen acetic acid

Question. Ethene can be prepared by reaction of ethanol with
(a) Hot conc. \( H_2SO_4 \)
(b) Alkaline \( KMnO_4 \)
(c) Sodium metal
(d) \( NaHCO_3 \)
Answer: (a) Hot conc. \( H_2SO_4 \)

Question. The reaction, \( 2C_2H_5OH + 2Na \rightarrow 2C_2H_5ONa + H_2 \) suggests that ethanol is
(a) acidic in nature
(b) basic in nature
(c) amphoteric in nature
(d) neutral in nature
Answer: (a) acidic in nature

Question. Saponification means
(a) Acid hydrolysis
(b) Alkaline hydrolysis
(c) Esterification
(d) Dehydration
Answer: (b) Alkaline hydrolysis

Question. The structural formula of ethyl ethanoate is
(a) \( CH_3 – CO – OCH_3 \)
(b) \( CH_3 – CO – OCH_2CH_3 \)
(c) \( CH_3CH_2 – CO – OCH_2CH_3 \)
(d) \( CH_3CH_2 – CO – OCH_3 \)
Answer: (b) \( CH_3 – CO – OCH_2CH_3 \)

Question. Conversion of ethanol to ethanoic acid is a/an
(a) substitution reaction
(b) oxidation reaction
(c) addition reaction
(d) rearrangement reaction
Answer: (b) oxidation reaction

Question. In the reaction \( CH_3COONa + NaOH \rightarrow \) the gas obtained is
(a) \( C_2H_6 \)
(b) \( C_2H_2 \)
(c) \( CH_4 \)
(d) \( C_2H_6 \)
Answer: (c) \( CH_4 \)

Question. Ethanol on complete oxidation gives
(a) carbon dioxide and water
(b) acetaldehyde
(c) acetic acid
(d) acetone
Answer: (a) carbon dioxide and water

Question. The by-product of soap industry is
(a) glycerol
(b) glycol
(c) isoprene
(d) acid
Answer: (a) glycerol

Question. \( C_2H_4 \) reacts with hydrogen in presence of Ni to give
(a) \( CH_4 \)
(b) \( C_2H_6 \)
(c) \( HCOOH \)
(d) \( HCHO \)
Answer: (b) \( C_2H_6 \)

Question. Which of the following salts when dissolved in water produce hard water?
(a) Calcium sulphate
(b) Magnesium bicarbonate
(c) Calcium bicarbonate
(d) All of the options
Answer: (d) All of the options