Class 10 Chemistry



Periodic Classification

NCERT Exemplar Problems

Which of the following is the outermost shell for elements of period 2?

  • K shell
  • L shell
  • M shell
  • N shell
    Answer: (b) L shell

Which one of the following elements exhibit maximum number of valence electrons?

  • Na
  • Al
  • Si
  • P
    Answer: (d) P

Which of the following gives the correct increasing order of the atomic radii of O, F and N?

  • O, F, N
  • N, F, O
  • O, N, F
  • F, O, N
    Answer: (d) F, O, N

Which among the following elements has the largest atomic radii?

  • Na
  • Mg
  • K
  • Ca
    Answer: (c) K

Which of the following elements would lose an electron easily?

  • Mg
  • Na
  • K
  • Ca
    Answer: (c) K

Which of the following elements does not lose an electron easily?

  • Na
  • F
  • Mg
  • Al
    Answer: (b) F

Which of the following are the characteristics of isotopes of an element?

  • Isotopes of an element have same atomic masses
  • Isotopes of an element have same atomic number
  • Isotopes of an element show same physical properties
  • Isotopes of an element show same chemical properties
  • (i), (iii) and (iv)
  • (ii), (iii) and (iv)
  • (ii) and (iii)
  • (ii) and (iv)
    Answer: (b) (ii), (iii) and (iv)

Arrange the following elements in the order of their decreasing metallic character: Na, Si, Cl, Mg, Al

  • Cl > Si > Al > Mg > Na
  • Na > Mg > Al > Si > Cl
  • Na > Al > Mg > Cl > Si
  • Al > Na > Si > Ca > Mg
    Answer: (b) Na > Mg > Al > Si > Cl

Arrange the following elements in the order of their increasing nonmetallic character: Li, O, C, Be, F

  • F < O < C < Be < Li
  • Li < Be < C < O < F
  • F < O < C < Be < Li
  • F < O < Be < C < Li
    Answer: (c) F < O < C < Be < Li



Exemplar MCQ 1

Exemplar MCQ 3

Lesson