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Practice MCQ Questions and answers on Chemistry-GK

Learn and practice General Knowledge questions and answers on Chemistry with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-8 section-3

Each section contains 100 MCQs on Chemistry .
71
All isotopes of the same element have ________
Discuss
Answer & Solution
Answer: Option C
Solution:
All isotopes of the same element have the same atomic number but different atomic masses.
72
The fundamental particles present in the nucleus of an atom are
Discuss
Answer & Solution
Answer: Option B
Solution:
The nucleus is the positively charged centre of an atom and contains most of its mass. It is composed of protons, which have a positive charge, and neutrons, which have no charge.
73
J.J. Thomson’s proposed model of atom is generally called ________ model.
Discuss
Answer & Solution
Answer: Option B
Solution:
J.J. Thomson’s proposed model of atom is generally called plum and pudding model.
74
What particles move around the nucleus of an atom and are negatively charged?
Discuss
Answer & Solution
Answer: Option A
Solution:
Electrons are negatively charged particles that generally orbit the nucleus of an atom. Electrons are much smaller than protons or neutrons.
75
All isotopes of the same element have ______________
Discuss
Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
76
Atoms having the same number of protons but different number of neutrons are called :
Discuss
Answer & Solution
Answer: Option A
Solution:
Two atoms with the same atomic number, but different mass numbers (same number of protons, different number of neutrons), are called isotopes, or isotopic nuclides.
77
Chemical properties of isotopes
Discuss
Answer & Solution
Answer: Option A
Solution:
Different isotopes of an element generally have the same physical and chemical properties. That's because they have the same numbers of protons and electrons.
78
Which of the following does the nucleus of an atom consists of?
Discuss
Answer & Solution
Answer: Option A
Solution:
The nucleus of an atom consists of neutrons and protons, which in turn are the manifestation of more elementary particles, called quarks, that are held in association by the nuclear strong force in certain stable combinations of hadrons, called baryons.
79
The nucleus of an atom consists of
Discuss
Answer & Solution
Answer: Option A
Solution:
The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral. Protons and neutrons are in turn made up of particles called quarks.
80
The mass number of a nucleus is
Discuss
Answer & Solution
Answer: Option D
Solution:
The mass number (A), is the total number of protons and neutrons in an atomic nucleus so sometimes more than and sometimes equal to its atomic number, depends upon no of neutrons.