set 1 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on atomic structure molecules and nuclear chemistry topic of general science mcq
(a) same atomic number
(b) same mass number
(c) same number of neutrons
(d) None of these
The correct answers to the above question in:
Answer: (a)
Isotopes have a same atomic number but a different mass numbers.
e.g., 17Cl35 and 17Cl36 .
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Read more chemistry basic Based General Science Questions and Answers
Question : 1
In atom, neutron was discovered by
a) Chadwick
b) Rutherford
c) J.J. Thomson
d) Newton
Answer »Answer: (a)
Question : 2
The atoms, in which the number of protons is same but the number of neutrons is different, are known as
a) Isomers
b) Isotones
c) Isobars
d) Isotopes
Answer »Answer: (d)
Question : 3
Which one of the following statement is not true ?
a) The total number of neutrons and protons is always equal in a neutral atom
b) The total number of electrons and protons in an atom is always equal
c) Most of the space in an atom is empty
d) The total number of electrons in any energy level can be calculated by the formula 2n2
Answer »Answer: (a)
e.g., In 17Cl35 no. of p = 17 but no. of n = 35 – 17 = 18
Question : 4
An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?
a) 10
b) 6
c) 12
d) 14
Answer »Answer: (b)
Question : 5
Which of the following statements is incorrect for cathode rays?
a) Their nature depends upon the nature of gas present in the discharge tube.
b) They cost shadow of solid objects placed in their path
c) They move in straight line
d) They get deflected towards positive charge.
Answer »Answer: (a)
Question : 6
Adding electrons to an atom will result in a (an)
a) anion
b) cation
c) molecule
d) salt
Answer »Answer: (a)
e.g., Cl + e- ⟶ Cl- (anion)
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