NCERT Class X Science Class: Chapter – 4. Carbon and Its Compounds – Part-4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 17:

Ethanol reacts with sodium and forms two products. These are

  1. Sodium ethanoate and hydrogen
  2. Sodium ethanoate and oxygen
  3. Sodium Ethoxide and hydrogen
  4. Sodium Ethoxide and oxygen

Answer: C

Image Reaction of Ethanol with Sodium

Question 18:

The correct structural formula of butanoic acid is

Answer: D

Question 19:

Vinegar is a solution of

Answer: C

Image Acetic Acid Reaction with Water

Question 20:

Mineral acids are stronger acids than carboxylic acids because

  1. Mineral acids are completely ionized.
  2. Carboxylic acids are completely ionized.
  3. Mineral acids are partially ionized.
  4. Carboxylic acids are partially ionized.
  5. (i) and (iv)
  6. (ii) and (iii)
  7. (i) and (ii)
  8. (iii) and (iv)

Answer: A

Carboxylic acids:

Image Carboxylic Acids Are Partially Ionized

Question 21:

Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e. g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of

  1. Helium
  2. Neon
  3. Argon
  4. Krypton

Answer: B

Image the Structure of Neon