Periodic Classification of Elements MCQ Questions for Class 10 Science Chapter 5 with Answers

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MCQ Questions for Class 10 Science with Answers Chemistry

Q1. The element which has least tendency to lose electron is

(A) H
(B) Li
(C) He
(D) Ne

Q2. The most distinctive property of the noble gases is that they are:

(A) Unreactive
(B) Radioactive
(C) Metalloid
(D) Metallic

Q3. Which one of the following statements is not correct about the trends in the properties of the elements of a group on going down in a group?

(A) The chemical reactivity of metals increases.
(B) The metallic character of elements increases.
(C) The size of the atom increases.
(D) The valence electrons increase.

Q4. According to IUPAC recommendations, the number of groups in the long form of the periodic table is:

(A) 7
(B) 8
(C) 16
(D) 18

Q5. Which of the following elements of noble gases participate in chemical reaction?

(A) Kr, Rn
(B) He, Kr
(C) Rn, He
(D) He, Ne

Q6. Upto which element, the Law of Octaves was found applicable?

(A) Oxygen
(B) Calcium
(C) Cobalt
(D) Potassium

Q7. An element X combines with oxygen to form an oxide XO. This oxide is electrically conducting. Write the formula of the compound formed when X reacts with chlorine.

(A) XCl3
(B) XCl
(C) XCl2
(D) XCl5

Q8. At the time of Mendeleev, the number of elements known was

(A) 63
(B) 65
(C) 62
(D) 64

Q9. How many elements are placed in lanthanide and actinide series?

(A) 57, 89
(B) 14, 14
(C) 89, 57
(D) 14, 16

Q10. As we move from left to right in a period in modern periodic table, Atomic sizes of the elements generally

(A) increase
(B) decrease
(C) remain same
(D) approach zero

Q11. An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.

(A) Valency = 6
(B) Valency = 2
(C) Valency = 1
(D) Valency = 3

Q12. Newlands relation is called

(A) Musical Law
(B) Law of Octaves
(C) Periodic Law
(D) Atomic Mass Law

Q13. An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?

(A) Group 1
(B) Group 4
(C) Group 2
(D) Group 3

Q14. The arrangement of elements in the Modem Periodic Table is based on their

(A) increasing atomic mass in the period
(B) increasing atomic number in the horizontal rows
(C) increasing atomic number in the vertical columns
(D) increasing atomic mass in the group

Q15. Which of the following is the outermost shell for elements of second period?

(A) K shell
(B) L shell
(C) M shell
(D) N shell

Q16. An atom of an element has the electronic configuration 2,8,2. To which group does it belong?

(A) 4th group
(B) 6th group
(C) 3rd group
(D) 2nd group

Q17. Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.

(A) Helium
(B) Argon
(C) Neon
(D) Krypton

Q18. Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is

(A) 7
(B) 14
(C) 24
(D) 16

Q19. Dobereiner’s triad arranged the elements with similar properties into:

(A) Periods
(B) Groups
(C) Both period and group
(D) None of these

Q20. Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?

(A) Group 8
(B) Group 2
(C) Group 18
(D) Group 10

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