DOWNLOAD MOBILE APPLICATION TO LEARN MORE: MCQ ON PERIODIC CLASSIFICATION OF ELEMENTS CLASS 10
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: MCQ ON PERIODIC CLASSIFICATION OF ELEMENTS CLASS 10
POINTS TO REMEMBER AND IMPORTANT QUESTIONS
Making Order Out Of Chaos- Early Attempt At The Classification Of Elements
■ Classification of elements is primarily based on the similarity in their properties.
■ Dobereiner was first to group the elements into triads in which atomic mass of central element was arithmetic mean of the other two.
■ Newland gave the law of octaves according to which on arranging the element in order of increasing atomic weight every eighth element had properties similar to the first.
DOWNLOAD MOBILE APPLICATION TO LEARN MORE: MCQ ON PERIODIC CLASSIFICATION OF ELEMENTS CLASS 10
Table of Contents
MCQ ON PERIODIC CLASSIFICATION OF ELEMENTS CLASS 10
1. Up to which element, the Law of Octaves was found to be applicable
- Oxygen
- Calcium
(c) Cobalt
(d) Potassium
Ans. (b)
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
Ans. (c)
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 periodic table later?
(a) Germanium.
(b) Chlorine
(c) Oxygen
(d) Silicon
Ans. (a)
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
Ans. (b)
5.Which of the following statements about the modern periodic table is correct?
(a) It has 18 horizontal rows known as Periods
(b) It has 7 vertical columns known as Periods
(c) It has 18 vertical columns known as Groups
(d) It has 7 horizontal rows known as Groups
Ans. (c)
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6. 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
Ans. (c)
7.An element which is an essential constituent of all organic compounds belongs to
(a) group 1
(b) group 14
(c) group 15
(d) group 16
Ans. (b)
8. Which of the following is the outermost shell for elements of period 2?
(a) K shell
(b) L shell
(c) M shell
(d) N shell
Ans. (b)
9. Which one of the following elements exhibit maximum number of valence electrons?
(a) Na
(b) Al
(c) Si
(d) P
Ans. (d)
10. Which among the following elements has the largest atomic radii?
(a) Na
(b) Mg
(c) K
(d) Ca
Ans. (c)
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11. Which of the following elements does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
Ans. (b)
12. Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic mass
(ii) Isotopes of an element have same atomic number
(iii) Isotopes of an element show same physical properties
(iv) Isotopes of an element show same chemical properties
(a) (i), (iii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Ans. (d)
13. Three elements B, Si and Ge are
(a) metals
(b) non-metals
(c) metalloids
(d) metal, non-metal and metalloid respectively
Ans. (c)
14. Which of the following elements will form an acidic oxide?
(a) An element with atomic number 7
(b) An element with atomic number 3
(c) An element with atomic number 12
(d) An element with atomic number 19
Ans. (a)
15. The elements with atomic number 14 are hard and forms acidic oxide and a covalent halide. To which of the following does the element belong?
(a) Metal
(b) Metalloid
(c) Non-metal
(d) Left-hand side element
Ans. (b)
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16. Which one of the following does not increase while moving down the group of periodic table?
(a) Atomic radius
(b) Metallic character
(c) Valency
(d) Number of shells in an element.
Ans. (c)
17. On moving left to right in the periodic table, the size of the atom
(a) increases
(b) decreases
(c) does not change appreciably
(d) first decreases then increases
Ans. (b)
18. Which of the following set of elements is written in order of their increasing metallic character?
(a) Be, Mg, Ca
(b) Na, Li, K
(c) Mg, Al, Si
(d) C, O, N
Ans. (a)
19. Which of the following is not a correct statement about the trends when going from left to right across the period of periodic table?
(a) The elements become less metallic in nature
(b) The number of valence electrons increases
(c) The atoms lose their electrons more easily.
(d) The oxides become more acidic
Ans. (c)
20. The element X forms a chloride with formula XC12 which is a solid with high melting point. X would most likely be in the same group of periodic table as
(a) Na
(b) Mg
(c) Al
(d) Si
Ans. (b)
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