CLASS 10 SCIENCE CHAPTER 5 MCQ WITH ANSWER TEST 4


PRACTISE TEST 1 PRACTISE TEST 2 PRACTISE TEST 3 PRACTISE TEST 4 PRACTISE TEST 5 PRACTISE TEST 6 PRACTISE TEST 7 PRACTISE TEST 8 PRACTISE TEST 9 PRACTISE TEST 10


Question 76.
Vertical columns are called as –
(a) Groups
(b) Period
(c) Rows
(d) None

Answer

Answer: (a) Groups



Question 77.
How many groups are there in the periodic table?
(a) 18
(b) 8
(c) 28
(d) 17

Answer

Answer: (a) 18



Question 78.
The valence shell of element A contains 3 electrons while the valence shell of element B contains 6 electrons. If A combines with B, the probable chemical formula of the compound is
(a) AB2
(b) A2B
(c) A2B3
(d) A3B2

Answer

Answer: (c) A2B3



Question 79.
Which one of the following elements exhibit maximum number of valence electrons?
(a) Na
(b) Al
(c) Si
(d) P

Answer

Answer: (d) P



Question 80.
Which group was added in Mendleev’s periodic table?
(a) I group
(b) Zero group
(c) VIII group
(d) V group

Answer

Answer: (b) Zero group



Question 81.
Element ‘A’ has electronic configuration 2, 7; ‘B’ has electronic configuration 2, 8, 5 and ‘C’ has electronic configuration 2, 8, 7. Which two elements will exhibit similar chemical properties?
(a) A and C (b) A and B (c) B and C (d) None of these

Answer

Answer: (a) A and C



Question 82.
What is the special name given to the 17th group?
(a)) chalcogens
(b)) halogens
(c)) alkali metals
(d)) inert gases

Answer

Answer: (b) halogens



Question 83.
Which of the following are the characteristics of isotopes of an element?
(i) Isotopes of an element have same atomic masses
(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)

Answer

Answer: (b) (ii), (iii) and (iv)



Question 84.
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

Answer

Answer: (b) Group 4



Question 85.
Chalcogens are ?
(a)) ore forming
(b)) salt forming
(c)) hydroxide forming
(d)) None

Answer

Answer: (a) ore foming



Question 86.
Which of the following properties does not match element of the halogen family?
(a) They have seven electrons in their valence shell.
(b) They are highly reactive.
(c) They are metallic in nature.
(d) They are diatomic in their molecular form.

Answer

Answer: (c) They are metallic in nature.



Question 87.
The electronic configuration of the atom of an element X is 2, 4, 8. In the modern periodic table, the element X is placed in:
(a) 2nd group
(b) 4th group
(c) 14th group
(d) 8th group

Answer

Answer: (c) 14th group



Question 88.
Atomic mass is equal to the sum of ____.
(a)) P+N
(b)) P+E
(c)) Number of Protons
(d)) Number of neutrons

Answer

Answer: (b) Her mother and grandmother went to the hospital



Question 89.
What is the order of the metallic character down the group?
(a) it decreases as new shells are added to the element
(b) it increases as electrons move away from the nucleus
(c) increases as new atoms are added in the same shell
(d) it decreases as the effective nuclear charge on the electron increases

Answer

Answer: (b) it increases as electrons move away from the nucleus



Question 90.
Which of the following element would lose an electron easily?
(a) Mg
(b) Na
(c) K
(d) Ca

Answer

Answer: (c) K



Question 91.
What is the trend of valency along the periods in the modern periodic table?
(a) it increases from left to right
(b) it decreases from right to left
(c) it increases and then decreases
(d) it decreases and then increases

Answer

Answer: (c) it increases and then decreases



Question 92.
Electronegativity is defined as the ability of an element to form bonds by gaining electrons. How does the electronegativity of elements vary across the periods?
(a) it increases as the number of shells increases
(b) decreases as the number of shells decreases
(c) increases as the more of electrons are added to the same shell
(d) it decreases as the more of electrons are added to the same shell

Answer

Answer: (c) increases as the more of electrons are added to the same shell



Question 93.
Name the most electronegative element of Periodic table ?
(a)) Chlorine
(b)) Bromine
(c)) Fluorine
(d)) Iodine

Answer

Answer: (c) Flurine



Question 94.
Write valency of Iron ?
(a) 2
(b) 3
(c) 0
(d) 2, 3

Answer

Answer: (d) 2,3



Question 95.
Boron is a non-metal and is placed under group 13 and period 2. How can boron form bonds with other elements?
(a) by sharing 5 electrons
(b) by sharing 3 electrons
(c) by sharing 2 electrons
(d) by sharing 1 electron

Answer

Answer: (b) by sharing 3 electrons



Question 96.
Electron affinity is ____.
(a) always negative
(b) always positive
(c) can be negative or positive
(d) zero

Answer

Answer: (c) can be negative or positive



Question 97.
The element A, B, C, D and E have atomic numbers 9, 11, 17, 12 and 13 respectively. The pair of elements which belongs to the same group of the periodic table is:
(a) A and B
(b) B and D
(c) A and C
(d) D and E

Answer

Answer: (c) A and C



Question 98.
Out of Mg and Al which has higher ionisation energy?
(a) Mg
(b) both have same
(c) Al
(d) none

Answer

Answer: (c) Al



Question 99.
Ionisation energy is measured in –
(a)) KJ/g
(b)) J/mole
(c)) KJ/mol
(d)) none

Answer

Answer: (c) KJ/mol



Question 100.
A student learns that the atomic size depends on the atomic radius of the elements. How does the atomic radius of elements in the third-period change as one goes from sodium to argon?
(a) Option 1: atomic radius increases from sodium to argon
(b) atomic radius decreases from sodium to argon
(c) atomic radius increases as new shells are added
(d) atomic radius decreases due to the addition of new shells

Answer

Answer: (b) atomic radius decreases from sodium to argon