Class X Science
Subject: Chemistry
Periodic Classification of Elements
Q. 1. How many periods and groups are present in the periodic table?(A) 7 periods and 18 groups
(B) 8 periods and 7 groups
(C) 7 periods and 7 groups
(D) 8 periods and 8 groups
Right Ans:- 7 periods and 18 groups
Q. 2. Which of the following forms the basis of the modern periodic table?
(A) Atomic mass
(B) Atomic number
(C) Number of nucleons
(D) All of these
Right Ans:- Atomic number
Q. 3. What happens to the electropositive character of elements on moving from left to right in a periodic table?
(A) Increase
(B) Decreases
(C) First increases than decreases
(D) First decreases than increases
Right Ans:- Decreases
Q. 4. The electronic configuration of an element M is 2, 8, 4. In modern periodic table, the element M is placed in
(A) 4th group
(B) 2th group
(C) 14th group
(D) 18th group
Right Ans:- 14th group
Q. 5. Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?
(A) O < F < N
(B) N < F < O
(C) O < N < F
(D) F < O < N
Right Ans:- F < O < N
Q. 6. What is the other name for group 18th elements?
(A) Noble gases
(B) Alkali metals
(C) Alkali earth metals
(D) Halogens
Right Ans:- Noble gases
Q. 7. Which of the following is the most reactive element of the group 17?
(A) Oxygen
(B) Sodium
(C) Fluorine
(D) Magnesium
Right Ans:- Fluorine
Q. 8. Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as
(A) Na
(B) Mg
(C) Al
(D) Si
Right Ans:- Mg
Q. 9. Which group elements are called transition metals?
(A) Group number 1 to 2
(B) Group number 13 to 18
(C) Group number 3 to 12
(D) Group number 1 to 8
Right Ans:- Group number 3 to 12
Q. 10. Which of the following elements has 2 shells and both are completely filled?
(A) Helium
(B) Neon
(C) Calcium
(D) Boron
Right Ans:- Neon
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