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Practice each question, then open the answer or worked solution.
Which of the following elements will form an acidic oxide?
The answer is (a) An element with atomic number 7
Explanation:
Element with atomic number 7 has electron configuration 2,5 which means it can gain 3 electrons and is an electronegative element. It should be a non-metal and non-metals will form acidic oxide.
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
The answer is (b) Metalloid
Explanation:
Element with atomic no. 14 is Silicon and is a metalloid. It forms an acidic oxide, thus behaving as a non- metal and also forms covalent halide, thus acting as a metal.
Which one of the following depicts the correct representation of the atomic radius(r) of an atom?
(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)
The answer is (b) (ii) and (iii)
Explanation:
Atomic radius is the distance between the nucleus and outermost orbital is shown clearly in images ii) and iii) whereas in image i) and iv) it is not depicted.
Which one of the following does not increase while moving down the group of the periodic table?
The answer is (c) Valence
Explanation:
Valency remain the same in a group.
On moving from left to right in a period in the periodic table, the size of the atom.
The answer is (b) decreases
Explanation:
Atomic radius decreases when we move from left to right in a period hence the size of the atom also decreases.
Which of the following set of elements is written in order of their increasing metallic character?
The answer is (a) Be Mg Ca
Explanation:
Metallic character increase as we move down the group. In the elements that belong to the same group Berrylium is at the top and Calcium is at the bottom.