NCERT Class X Science Class: Chapter –3. Metals and Nonmetals– Part-2

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Question 7:

Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (Except )?

  1. All of these

Answer: C

Image reaction with metals

Image Reaction with Metals

Image reaction with metals

Question 8:

The composition of aqua-regain is

Answer: C

Imagecomposition of aqua-regain

Imagecomposition of Aqua-Regain

Imagecomposition of aqua-regain

Question 9:

Which of the following are not ionic compounds?

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (iii) and (iv)

  4. (i) and (iii)

Answer: B

Image ionic compounds of HCl and CCL 4

Image Ionic Compounds of HCl and CCL 4

Image ionic compounds of HCl and CCL 4

Question 10:

Which one of the following properties is not generally exhibited by ionic compounds?

  1. Solubility in water

  2. Electrical conductivity in solid state

  3. High melting and boiling points

  4. Electrical conductivity in molten state

Answer: B

Electrical conductivity in solid

Electrical Conductivity in Solid

Electrical conductivity in solid

Question 11:

Which of the following metals exist in their native state in nature?

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (ii) and (iv)

  4. (iii) and (iv)

Answer: C

Image the nativ

Image the Nativ

Image the nativ

Question 12:

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

  1. (i) and (ii)

  2. (i) and (iii)

  3. (ii) and (iii)

  4. (iii) and (iv)

Answer: A

Image metal refined by electrolytic refining

Image Metal Refined by Electrolytic Refining

Image metal refined by electrolytic refining