Tag: properties of acids and bases

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Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

'The blue-green colour of the solution is due to the formation of copper(II) chloride in the reaction' is an example of which kind of chemical reaction?

  1. Reaction of metallic oxides with acids

  2. Reaction of non-metallic oxides with acids

  3. Reaction of metallic oxides with bases

  4. Reaction of non-metallic oxides with base
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Metal oxides always reacts with acid to form salt and water. Copper oxide when reacts with $HCl$ it forms blue-green copper(II) chloride. 

$2CuO + 2HCl \rightarrow 2CuCl _2 + H _2O$

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

Sulphuric acid reacts with cupric oxide to give:

  1. copper sulphate

  2. cuprous sulphate

  3. no reaction

  4. it converts to cuprous oxide.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$H _2SO _4 + CuO \rightarrow CuSO _4 + H _2O$


Sulphuric acid reacts with cupric oxide to give copper sulphate and water. 

Hence, the correct option is $\text{A}$

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The reaction between copper oxide and nitric acid forms:

  1. copper nitrate and hydrogen

  2. copper nitrite and water

  3. copper nitrite and hydrogen

  4. copper nitrate and water
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$CuO + 2HNO _3 \rightarrow Cu(NO _3) _2 + H _2O$

Copper oxide and nitric acid react to give copper nitrate and water.

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The black color of copper oxide turns blue on treating with $HCl$ because of:

  1. formation of cupric chloride

  2. formation of water

  3. release of hydrogen

  4. release of carbon dioxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When $HCl$ reacts with copper oxide, the black color of copper oxide turns blue due to formation of its corresponding salt i.e. calcium chloride. Water is formed along with salt.

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The more non-metallic character of an element represents,  _______  oxide.

  1. less acidic

  2. more acidic

  3. neutral

  4. more basic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Generally, more metallic character of an element represent, formation of more basic oxide. Likewise, the more non-metallic character an element has, the more acidic oxide. The metallic character of an element can be determined by its position on the periodic table.