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NCERT Exemplar · Class 10 Science Metals and Non-metals

65 questions · 65 still being checked

Multiple Choice Questions 1–10 (part 1 of 7)

  1. Exercise 1

    Which of the following property is generally not shown by metals?
    (a)
    Electrical conduction
    (b)
    Sonorous in nature
    (c)
    Dullness
    (d)
    Ductility

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    NCERT’s answer
    (c)
    (c) Dullness. Metals show a characteristic shine -- metallic lustre -- on a freshly cut surface; the other three, electrical conduction, sonority and ductility, are properties metals genuinely possess.Answer: (c) Dullness

  2. Exercise 2

    The ability of metals to be drawn into thin wire is known as
    (a)
    ductility
    (b)
    malleability
    (c)
    sonorousity
    (d)
    conductivity

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    (a)
    (a) Ductility. A metal that can be drawn into thin wire is ductile.

  3. Exercise 3

    Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
    (i)
    Good thermal conductivity
    (ii)
    Good electrical conductivity
    (iii)
    Ductility
    (iv)
    High melting point
    (a) (i) and (ii)
    (b) (i) and (iii)
    (c) (ii) and (iii)
    (d) (i) and (iv)

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    (d)
    (d) (i) and (iv). Good thermal conductivity carries heat from the flame to the food; a high melting point keeps the vessel solid on the flame.

  4. Exercise 4

    Which one of the following metals do not react with cold as well as hot water?
    (a)
    Na
    (b)
    Ca
    (c)
    Mg
    (d)
    Fe

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    (d)
    (d) Fe. Na and Ca react with cold water itself; Mg does not react cold but reacts with hot water; Fe reacts with neither, only with steam: \[3\mathrm{Fe(s)} + 4\mathrm{H_2O(g)} \xrightarrow{\Delta} \mathrm{Fe_3O_4(s)} + 4\mathrm{H_2(g)} \]Answer: (d) Fe

  5. Exercise 5

    Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
    (a)
    FeO
    (b)
    Fe2O3\displaystyle \mathrm{Fe}_2 \mathrm{O}_3
    (c)
    Fe3O4\displaystyle \mathrm{Fe}_3 \mathrm{O}_4
    (d)
    Fe2O3\displaystyle \mathrm{Fe}_2 \mathrm{O}_3 and Fe3O4\displaystyle \mathrm{Fe}_3 \mathrm{O}_4

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    (c)
    Hint— \(\displaystyle 3 \mathrm{Fe}(\mathrm{s})+4 \mathrm{H}_2 \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{Fe}_3 \mathrm{O}_4(\mathrm{s})+4 \mathrm{H}_2(\mathrm{g})\)
    (c) \(\displaystyle \mathrm{Fe_3O_4}\). Steam sustained over red-hot iron drives the reaction to the mixed oxide, not the simple ones: \[3\mathrm{Fe(s)} + 4\mathrm{H_2O(g)} \xrightarrow{\Delta} \mathrm{Fe_3O_4(s)} + 4\mathrm{H_2(g)} \]Answer: (c) \(\displaystyle \mathrm{Fe_3O_4}\)

  6. Exercise 6

    What happens when calcium is treated with water?
    (i)
    It does not react with water
    (ii)
    It reacts violently with water
    (iii)
    It reacts less violently with water
    (iv)
    Bubbles of hydrogen gas formed stick to the surface of calcium
    (a) (i) and (iv)
    (b) (ii) and (iii)
    (c) (i) and (ii)
    (d) (iii) and (iv)

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    (d)
    (d) (iii) and (iv). Calcium reacts, but less violently than sodium or potassium: \[\mathrm{Ca(s)} + 2\mathrm{H_2O(l)} \rightarrow \mathrm{Ca(OH)_2(aq)} + \mathrm{H_2(g)}\uparrow \] The \(\displaystyle \mathrm{H_2}\) bubbles cling to the metal surface, so calcium floats.Answer: (d) (iii) and (iv)

  7. Exercise 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 Mn and Mg)?
    (a)
    H2SO4\displaystyle \mathrm{H}_2 \mathrm{SO}_4
    (b)
    HCl
    (c)
    HNO3\displaystyle \mathrm{HNO}_3
    (d)
    All of these

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    NCERT’s answer
    (c)
    (c) \(\displaystyle \mathrm{HNO_3}\). Being a strong oxidiser, nitric acid oxidises the \(\displaystyle \mathrm{H_2}\) it would otherwise release into water, so no hydrogen escapes -- except with very dilute \(\displaystyle \mathrm{HNO_3}\) reacting with Mg or Mn.Answer: (c) \(\displaystyle \mathrm{HNO_3}\)

  8. Exercise 8

    The composition of aqua-regia is
    (a)
    Dil.HCl : Conc. HNO3\displaystyle \mathrm{HNO}_3 3\displaystyle 3 : 1\displaystyle 1
    (b)
    Conc.HCl : Dil. HNO3\displaystyle \mathrm{HNO}_3 3\displaystyle 3 : 1\displaystyle 1
    (c)
    Conc.HCl : Conc.HNO3\displaystyle \mathrm{HNO}_3 3\displaystyle 3 : 1\displaystyle 1
    (d)
    Dil.HCl : Dil.HNO3\displaystyle \mathrm{HNO}_3 3\displaystyle 3 : 1\displaystyle 1

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    (c)
    (c) Conc. \(\displaystyle \mathrm{HCl}\) : Conc. \(\displaystyle \mathrm{HNO_3}\), $\displaystyle 3$ : 1. Freshly mixed, this blend of the two concentrated acids dissolves even noble metals such as gold and platinum.

  9. Exercise 9

    Which of the following are not ionic compounds?
    (i)
    KCl
    (ii)
    HCl
    (iii)
    CCl4\displaystyle \mathrm{CCl}_4
    (iv)
    NaCl
    (a) (i) and (ii)
    (b) (ii) and (iii)
    (c) (iii) and (iv)
    (d) (i) and (iii)

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    (b)
    (b) \(\displaystyle \mathrm{HCl}\) and \(\displaystyle \mathrm{CCl_4}\)Electron transfer between a metal and a nonmetal gives ionic bonds, as in \(\displaystyle \mathrm{KCl}\) and \(\displaystyle \mathrm{NaCl}\); two nonmetal atoms instead share electrons, so \(\displaystyle \mathrm{HCl}\) and \(\displaystyle \mathrm{CCl_4}\) are covalent.

  10. Exercise 10

    Which one of the following properties is not generally exhibited by ionic compounds?
    (a)
    Solubility in water
    (b)
    Electrical conductivity in solid state
    (c)
    High melting and boiling points
    (d)
    Electrical conductivity in molten state

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    (b)
    (b) Electrical conductivity in solid stateIons are locked in the solid lattice and cannot move; they move only when molten or dissolved.