Question

(9) Which scientist mainly contributes to classification of elements ?

(A) Dmitri Ivanovich Mendeleev (B) A. E. B. Kankortois

(C) John Newland (D) Wolfgang Dobereiner

(10) On which basis Mendeleev arranged elements ?

(A) Basic properties of elements (B) Atomic mass

(C) Similarity in chemical properties (D) All of the given

(11) Which of the following is the Mendeleev’s periodic law ?

(A) The properties of elements are periodic function of their atomic number

(B) Properties of elements are a periodic function of their atomic number

(C) The properties of elements are periodic function of their chemical properties

(D) The properties of elements are periodic function of their isotopes

(12) In periodic table of Mendeleev, arrangement of elements was done in ..........

(A) 6 periods and 8 group (B) 6 periods and 18 group

(C) 7 periods and 8 group (D) 7 periods and 18 group

(13) For which of the following elements, Mendeleev kept the position of element blank ? Which

element was not it ?

(A) Eka-Boron (B) Eka-Aluminium (C) Eka-Silicon (D) Eka-Potassium

(14) What name did Mendeleev give to Eka-Silicon element ?

(A) Galium (B) Germanium (C) Scandium (D) Nobelium




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Answer 1

Answer:

9 . A

10. B

11. B

12. A

13. C

14. B

hope it is helpfull