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CHEMISTRY [2 Mark Question Answer]

Atoms, Molecules and Radicals · ICSE STD 7 (ICSE - English Medium). 3 questions.

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[2 Mark Question Answer]

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Question 12 Marks
Name the following radicals and give their valencies:
1. $SO _4$
2.$CO _3$
3.$OH _4$
4.$Cr _2 O _7$​​​​​​​
Answer
Radicals Valency
(i) Sulphate $SO _4$ 2
(ii) Carbonate $CO _3$ 2
(iii) Hydroxide $OH _4$ 1
(iv) Dichromate $Cr _2 O _7$ 2
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Question 32 Marks
State Dalton’s atomic theory.
Answer
  1. Matter is made up of tiny particles called atoms
  2. Atoms are indivisible.
  3. Atom can be neither be created nor destroyed.
  4. Atoms of same element are identical in mass and properties
  5. Atoms of different elements differ in mass and properties
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[2 Mark Question Answer] - CHEMISTRY STD 7 Questions - Vidyadip