Question

1. Upto which element, the Law of Octaves was found to be applicable

(a) Oxygen

(b) Calcium

(c) Cobalt

(d) Potassium

2. According to Mendeleev's ′ Periodic Law, the elements were

arranged in the periodic table in the order of

(a) increasing atomic number

(b) decreasing atomic number

(c) increasing atomic masses

(d) decreasing atomic masses

3. In Mendeleev ′ ’s Periodic Table, gaps were left for the elements to

be discovered later. Which of the following elements found a place

in the perioidc table later

(a) Germanium

(b) Chlorine

(c) Oxygen

(d) Silicon

4. Which of the following statement (s) about the Modern Periodic

Table are incorrect

(i) The elements in the Modern Periodic Table are arranged on

the basis of their decreasing atomic number

(ii) The elements in the Modern Periodic Table are arranged on

the basis of their increasing atomic masses

(iii) Isotopes are placed in adjoining group (s) in the Periodic Table

(iv) The elements in the Modern Periodic Table are arranged on

the basis of their increasing atomic number

(a) (i) only (b) (i), (ii) and (iii)

(c) (i), (ii) and (iv) (d) (iv) only​

Answer 1

Answer:

c

Explanation:

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