Question

Read the following and answer the questions from (i) to (iv)

Many scientists like Dobernier, Newlands and Mendeleev tried to classify the elements. The properties of elements ,like atomic size electro positivity electro negativity chemical reactivity and nature of the oxides depends on their position in periodic table
(i) An element "y" form positive ion and is highly reactive. Its position in the modern table will be
(a) Group 17 and period 2
(b) Group 16 and period 4
(c) Group 1 and period 6
(d) Group 2 and period 5

(ii)An element "x" is forming an acidic oxide. Its position in modern periodic table will be
(a) Group 1 and period 3
(b) Group 2 and period 3
(c) Group 13 and period 3
(d) Group 16 and period 3

(iii) Isotopes are
(a) atoms of an element with similar chemical properties but different atomic masses. (b) atoms of different elements with similar chemical properties but different atomic masses.
(c) atom of an element with different chemical properties but same atomic masses .
(d) atoms of different elements with different chemical properties but same atomic masses.

(iv) Consider the following statements about an element ‘X’ with number of protons 13.
(A) It forms amphoteric oxide
(B) Its valency is three
(C) The formula of its chloride is XCl3
The correct statements(s) is/are
a) only (A)
b) only (B)
c) (A) and (C)
d) (A),(B) and (C)

Answer 1

Answer:

ok

Explanation:

I THINK THE ANSWER IS C but not sure

Answer 2

(i) An element "y" form positive ion and is highly reactive. Its position in the modern table will be

Group 1 and period 6

(ii)An element "x" is forming an acidic oxide. Its position in modern periodic table will be

Group 16 and period 3

(iii) Isotopes are

(b) atoms of different elements with similar chemical properties but different atomic masses.

(iv) Consider the following statements about an element ‘X’ with number of protons 13.

(A) It forms amphoteric oxide

(A) It forms amphoteric oxide(B) Its valency is three

(A) It forms amphoteric oxide(B) Its valency is three(C) The formula of its chloride is AlCl3

So d) (A),(B) and (C) is your answer