Question

Which element burns with a brilliant white flame when ignited?

Answer 1

Hey dear,

● Answer -

c) Cl2O7

● Explaination -

Let's calculate oxidation state of Cl atom in all oxides.

We'll take OS of O as -2 and that of Cl as x.

In Cl2O,

2×x + 1(-2) = 0

2x - 2 = 0

x = +1

In Cl2O5,

2×x + 5(-2) = 0

2x - 10 = 0

x = +5

In Cl2O7,

2×x + 7(-2) = 0

2x - 14 = 0

x = +7

In Cl2O3,

2×x + 3(-2) = 0

2x - 6 = 0

x = +3

Higher the oxidation state higher acidic strength, therefore Cl2O7 is more acidic than others.

* As to your doubt, sum oxidation state of all ions in compound is equal to charge on it. That's why here total sum is taken 0 .

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Answer 2

Barium compounds produce green colors when heated, copper salts produce green and blue flames, sodium salts are yellow in flame, lithium compounds produce red colors, magnesium metal produces brilliant white light when burned, and strontium compounds produce brilliant red colors.