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Reaction of Acids with Metal Oxides

Copper oxide ...

Question

Copper oxide is a/an while potassium hydroxide is a/an .

A

base

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B

alkali

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C

acid

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D

salt

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Solution

The correct options are
A base
B alkali
A water soluble base is known as an alkali.
Copper oxide is a base because it will react with acids and neutralises them, but it is not an alkali because it does not dissolve in water. Potassium hydroxide is a base because it will react with acids and neutralises them. It's also an alkali because it dissolves in water.
Hence, all alkalis are bases but all bases are not alkalis.

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Similar questions

Q. Write the formula of the following compounds.
calcium hydroxide, copper chloride, iron sulphate, sodium carbonate, copper nitrate, copper oxide, lead sulphide, magnesium chloride, zinc sulphate, potassium hydroxide.

Q. Give equations for the following conversions:
(i) Sodium to sodium hydroxide using water.
(ii) Steam to hydrogen using burning magnesium.
(iii) Dilute sulphuric acid to hydrogen using zinc.
(iv) Mercuric oxide to mercury.
(v) Silver oxide to silver.
(vi) Copper hydroxide to copper oxide.
(vii) Calcium hydroxide to calcium oxide.
(viii) Lead carbonate to lead.
(ix) Potassium nitrate to oxygen.
(x) Copper nitrate to nitrogen dioxide.
(xi) Mercuric nitrate to mercury.
(xii) Silver nitrate to silver.

Q. Give the equation for the preparation of each of the following salts from the starting material given.
(i) Copper sulphate from copper (II) oxide,
(ii) Iron (III) chloride from Iron.
(iii) Potassium sulphate from potassium hydroxide solution.
(iv) Lead chloride from lead carbonate (two equations).

Q. Copper oxide is a/an while potassium hydroxide is a/an .

Q. potassium oxide is called an alkali and copper oxide is not an alkali whereas both are metal oxide

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