CBSE Class 10 Science Carbon and its Compounds MCQs Set 06

Question. The substance not responsible for the hardness of water is   
(a) sodium nitrate
(b) calcium hydrogen carbonate
(c) calcium carbonate
(d) magnesium carbonate

Answer: A

Question. The by product of soap is     
(a) Isoprene
(b) Glycerol
(c) Butene
(d) Ethylene glycol

Answer: B

Question. The soap molecule has a __ Hydrophilic head and a
(a) hydrophobic tail
(b) Hydrophobic head and a hydrophilic tail
(c) Hydrophobic head and a hydrophobic tail
(d) Hydrophilic head and a hydrophilic tail

Answer: A

Question. How is vinegar made?
(a) By mixing 5 -8 % of acetic acid in water
(b) By mixing 25% of acetic acid in water
(c) By mixing 40% of acetic acid in water
(d) By mixing 50% of acetic acid in water

Answer: A

Question. Ethanol is also known as which of these?
(a) Formic acid
(b) Ethyl alcohol
(c) Ethane
(d) Acetaldehyde

Answer: B

Question. Which is not correct for isomers of a compound?
(a) They differ in physical properties
(b) They differ in chemical properties
(c) They have same molecular formula
(d) They have same structural formula

Answer: D

Question. Who prepared urea the first time by heating ammonium cyanate?
(a) Wohler
(b) Lavosier
(c) Fuller
(d) Haber

Answer: A

Question. Which of the following statements are usually correct for carbon compounds? These
(i) are good conductors of electricity
(ii) are poor conductors of electricity
(iii) have strong forces of attraction between their molecules
(iv) do not have strong forces of attraction between their molecules
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)

Answer: D

Question. Mineral Acids Are Stronger Acids Than Carboxylic Acids Because:
(a) Mineral acids are completely ionized, carboxylic acids are partially ionized.
(b) Carboxylic acids are completely ionized, mineral acids are partially ionized.
(c) Mineral acids are completely ionized, carboxylic acids are completely ionized.
(d) Mineral acids are partially ionized, Carboxylic acids are partially ionized.

Answer: A

Question. Covalent compounds
(a) have high melting and boiling point
(b) are mostly soluble in water
(c) are formed between atoms of metals and non-metals
(d) are formed by the sharing of electrons in the bonding atoms.

Answer: D

Question. Which of the following is used to oxidise ethanol to ethanoic acid?   
(a) Alkaline KMnO₄
(b) Conc. H₂SO₄
(c) Acidified K₂Cr₂O₇
(d) All of above

Answer: D

Question. Carbon compounds with single bond called……….   
(a) Unsaturated compound
(b) Carbon compounds
(c) Saturated compounds
(d) Ionic compounds

Answer: C

Question. A hydrocarbon should have a minimum of how many carbon atoms to show isomerism?   
(a) Three
(b) Four
(c) Fived
(d) Six

Answer: B

Question. The upper and lower homologue of C₂H₅OH are respectively   
(a) methyl alcohol and butyl alcohol
(b) ethyl alcohol and propyl alcohol
(c) butyl alcohol and propyl alcohol
(d) propyl alcohol and methyl alcohol

Answer: D

Question. Which of the given is used to oxidise ethanol to ethanoic acid?     
(a) Alkaline KMnO₄
(b) Conc. H₂SO₄
(c) Acidified K₂Cr₂O₇
(d) All of these

Answer: D

Question. A compound of carbon, hydrogen and nitrogen contains these elements in the ratio of their atomic mass 9 : 1 : 3.5, if its molecular mass is 108 u. What is its molecular formula?
(a) C₂H₂N
(b) C₃H₄N
(c) C₂HN₂
(d) C₆H₈N₂

Answer: D

Question. A compound ‘X’ reacts with a compound ‘Y’ , to produce a colourless and odourless gas. The gas turns lime water milky. When ‘X’ reacts with methanol in the presence of concentrated H₂SO₄, a sweet smelling substance is produced. The molecular formula of the compound ‘X’ is –
(a) C₂H₄O
(b) C₂H4O₂
(c) C₂H6O
(d) C₂H₆O₂

Answer: B

Question. When ethanoic acid reacts with ethanol, a sweet smelling product is formed. The functional group in the product is
(a) aldehyde
(b) ketone
(c) alcohol
(d) ester

Answer: D

Question. Hydrophobic end of micelles attack on………….
(a) Water
(b) Oil
(c) Acid
(d) Base

Answer: B

Question. Which of the following is a non-polar molecule?
(a) O₂
(b) HF
(c) NH₃
(d) H₂O

Answer: A

Question. functional group of alcohol.
(a) –OOH
(b) –OH
(c) –COH
(d) –COOH

Answer: B

Question. Which of the given can be used for the denaturation of ethyl alcohol?
(a) Methyl alcohol
(b) Pyridines
(c) Copper sulphate
(d) All of these

Answer: D

Question. Which property of methane helps it to be used as a fuel?
(a) It burns exothermically.
(b) It is a gas.
(c) It is odourless.
(d) It has a low boiling point.

Answer: A

Question. Which of the following statements is correct about Buckminster fullerene?
(a) It is like a football.
(b) It looks like a geodesic dome.
(c) It has hexagonal ring structure.
(d) Both (a) and (b)

Answer: D

Question. Ionic compounds have does not show below property.   
(a) High melting point
(b) High boiling point
(c) Conduction of electricity in solid state
(d) Conduction of electricity in molten state

Answer: C

Question. Which of the given has a triple bond?     
(a) Hydrogen molecule
(b) Oxygen molecule
(c) Nitrogen molecule
(d) Ammonia molecule

Answer: C

Question. Which of the given is not an aliphatic hydrocarbon?     
(a) Ethene
(b) Ethane
(c) Propyne
(d) Benzen

Answer: D

Question. Methane, ethane and propane are said to form a homologous series because all are-   
(a) Hydrocarbons
(b) saturated compounds
(c) aliphatic compounds
(d) differ from each other by a CH₂ group

Answer: D

Question. The molecular formula of carboxylic acid that differs from the rest is
(a) C₁₃H₂6O₂
(b) C₂H₄O₂
(c) C₉H₁₈O₂
(d) C₇H₁₂O₂

Answer: D

Question. An organic compound A on heating with concentrated H2SO4 gave product B and on warming with alkaline KMnO4 gave compound C. Compound A on heating with compound C in presence of concentrated H2SO4 formed compound D, which has fruity smell. Identify the compounds A, B, C and D:
(a) A = Alcohol, B = Carboxylic acid, C = Alkene, D = Ester
(b) A = Carboxylic acid, B = Ester, C = Alkene, D = Alcohol
(c) A = Alcohol, B = Alkene, C = Carboxylic acid, D = Ester
(d) A = Alkene, B = Alcohol, C = Ester, D = Carboxylic acid

Answer: C