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Answer 1

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Answer 2

$\large\underline\mathfrak\red{Question \: :- }$

• Find Valencies of underline elements or radicals from the compound.

$\sf{\underline{ Ba}}{Cl_2}$

Underline element : Ba - Barium

Atomic number : 56

Valency : 2

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$\sf{\underline{P}}{Cl_3}$

Underline element : P - Phosphorus

Atomic number : 15

Valency : 3

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$\sf{\underline{N}}{H_3}$

Underline element : N - Nitrogen

Atomic number : 7

Valency : 5 or 3

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$\sf{Mg}{\underline{So_4}}$

Underline element : So4 - Sulphate

Atomic number : It is a compound

Valency : 2

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$\sf{Ca}{\underline{CO_3}}$

Underline element : Co3 - Carbon trioxide

Atomic number : It is a compound

Valency : 2

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$\sf{\underline{Na_2}}{O}$

Underline element : Na - Sodium

Atomic number : 11

Valency : 1

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$\sf{\underline{Ca}}{O}$

Underline element : Ca - Calcium

Atomic number : 20

Valency : 2

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$\sf{\underline{Ca}}{(OH)_2}$

Underline element : Ca - Calcium

Atomic number : 20

Valency : 2

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$\sf{\underline{Fe}}{So_4}$

Underline element : Fe - Iron

Atomic number : 26

Valency : 2,3

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$\sf{\underline{Fe}}{Cl_3}$

Underline element : Fe - Iron

Atomic number : 26

Valency : 2,3

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$\sf{\underline{Fe_2}}{O_3}$

Underline element : Fe - Iron

Atomic number : 26

Valency : 2,3

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$\sf{Na}{\underline{OH}}$

Underline element : OH - Hydroxide

Atomic number : -

Valency : The 'valency' of the OH ion is -1. This is because the ion has an overall charge of -1.

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$\sf{\underline{Al}}{(OH_3)}$

Underline element : Al - Aluminium

Atomic number : 13

Valency : 3

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$\sf{\underline{Na_2}}{CO_3}$

Underline element : Na - Sodium

Atomic number : 11

Valency : 1

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