Metals and Non-metals class 10 science NCERT Exemplar solution mcq part 2

Metals and Non-metals

Exemplar Problems

MCQ 2

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 state

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

  1. Cu
  2. Au
  3. Zn
  4. Ag
  1. (i) and (ii)
  2. (ii) and (iii)
  3. (ii) and (iv)
  4. (iii) and (iv)
    Answer: (c) (ii) and (iv)

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

  1. Au
  2. Cu
  3. Na
  4. K
  1. (i) and (ii)
  2. (i) and (iii)
  3. (ii) and (iii)
  4. (iii) and (iv)
    Answer: (d) (iii) and (iv)

Silver articles become black on prolonged exposure to air. This is due to the formation of

  1. Ag3N
  2. Ag2O
  3. Ag2S
  4. Ag2S and Ag3N
    Answer: (c) Ag2S

Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

  1. Gallium
  2. Aluminium
  3. Zinc
  4. Silver
    Answer: (c) Zinc

Stainless steel is very useful material for our life. In stainless steel, iron is mixed with

  1. Ni and Cr
  2. Cu and Cr
  3. Ni and Cu
  4. Cu and Au
    Answer: (a) Ni and Cr

If copper is kept in open air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

  1. CuSO4
  2. CuCO3
  3. Cu(NO3)2
  4. CuO
    Answer: (d) CuO

Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?

  1. Na
  2. Fe
  3. Cr
  4. Hg
    Answer: (d) Hg

Which of the following metals are obtained by electrolysis of their chlorides in molten state?

  1. Na
  2. Ca
  3. Fe
  4. Cu
  1. (i) and (iv)
  2. (iii) and (iv)
  3. (i) and (iii)
  4. (i) and (ii)
    Answer: (d) (i) and (ii)


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