Connect the appropriate pairs. Column A Column B (I) Number of atoms in one mole (i) 14 g (ii) Acidic radical (ii) M g 2 + (iii) Basic radical (iii) S O 4 2 - (iv) The weight of one mole of nitrogen atoms (iv) 2 m o l e s v) The number of moles in 88 g of C O 2 (v) 6 . 022 X 10 23

(i) Number of atoms in one mole: 6 . 022 X 10 23 , particles atoms, ions, or molecules The mole is the unit of measurement for substances in the SI units. (ii) Acidic radical: sulphate ion S O 4 2 - It carries two negative charges and formed from the ionisation of an acid. (iii) Basic radical: magnesium ion M g 2 + It carries two positive charges and formed from the ionisation of a magnesium compound. (iv) The atomic weight of the nitrogen atom, ( N ) = 7 g The weight of one mole of nitrogen atoms, ( N 2 ) = ( 2 × 7 ) = 14 g . A mole is equal to the atomic or molecular weight of a substance. Column A Column B (I) Number of atoms in one mole (I) 6 . 022 X 10 23 ii) Acidic radical (ii) S O 4 2 - (iii) Basic radical (iii) M g 2 + (iv) The weight of one mole of nitrogen atoms (iv) 14 g (v) The number of moles in 88 g of C O 2 (v) 2 m o l e s A mole is equal to the atomic or molecular weight of a substance.

E M B I B E

Science (Theory & Practical) Class-9>Chapter 9 - Chemical Formula and Mole Concept>Exercises>Q 4

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9th Chhattisgarh Board

IMPORTANT

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What are polyatomic ions? Give examples.

Important Questions on Chemical Formula and Mole Concept

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9th Chhattisgarh Board

IMPORTANT

Science (Theory & Practical) Class-9>Chapter 9 - Chemical Formula and Mole Concept>Exercises>Q 5

Connect the appropriate pairs.

Column A	Column B
(I) Number of atoms in one mole	(i) $14 g$
(ii) Acidic radical	(ii) $M g^{2 +}$
(iii) Basic radical	(iii) $S {O_{4}}^{2 -}$
(iv) The weight of one mole of nitrogen atoms	(iv) $2 m o l e s$
v) The number of moles in $88 g$ of $C O_{2}$	(v) $6.022 X 10^{23}$