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SAI International School
Lesson Notes

Subject-Chemistry
Ch-Is Structure of atom
Topic- Concept mapping of chapter-4

Assessment
Concept- Failure of Dalton’s atomic theory
Q1. Assertion: Atoms are indivisible. 1

Reason: Dalton’s atomic theory says that atoms are the smallest
particles which cannot be broken further.

Q2 Assertion: Gold and Silver atoms have similar properties. 1
Reason: Atoms are the fundamental particles of elements.
Q3 Assertion: One molecule of carbon dioxide contains one atom of carbon 1
and two atoms of oxygen.
Reason: Atoms of different elements combine in fixed ratio by mass to
form molecules.
Q.4 Which of the following is not a drawback of Dalton’s atomic theory? 1
(a) Atoms of same element are alike.
(b) It could not explain the existence of isotopes.
(c) Atoms are divisible.
(d) It could not explain the existence of isobars.

Q5 Atoms form compounds by combining in a ratio of whole numbers.(T/F) 1

Q6 Atoms of different elements have …………… properties. 1

Concept: Cathode and anode rays: Discovery of electrons and
protons

Q1. Assertion: Cathode rays are negatively charged. 1
Reason: Cathode rays composed of electrons.
Q2 Assertion: Anode rays from different gases are different. 1
Reason: Anode rays are composed of protons.
Q3 Assertion: Cathode rays are deflected towards negatively charged 1
electrode.
Reason: Cathode rays are composed of electrons.
Q4 Which of the following is not a property of anode rays? 1
(a) Anode rays produce fluorescence on Zinc sulphide screen.
(b) Anode rays from different gases are different.
(c) Anode rays are positively charged.
(d) Anode rays travel in a straight line.
Q5 Cathode rays are composed of protons.(T/F) 1