Question

if chemical formula of a compound is X to Y then write valency of X and Y ​

Answer 1

Answer:

x - 1

y- 2

Explanation:

X2Y means x hs valency 1 nd y hs 2

Answer 2

Valency of X and Y ​is 1 and 2 respectively.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

1. Positive is written first followed by the oxidation state of metal in roman numerals in square brackets.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

In $X_2Y$, X is having an oxidation state of +1 called as cation and anion is Y with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $X_2Y$

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