Question

metal hydroxide soluble in sodium hydroxide but not in ammonium hydroxide​

Answer 1

This is because sodium hydroxide is formed by ionic bonding whereas ammonium hydroxide is formed by covalent bonding
And also, metal hydroxide is formed by ionic bonding
Sodium hydroxide is also a polar solvent as it is formed by ionic bonding
And only those compounds formed by ionic bonding are able to dissolve in polar solvents whereas ammonium hydroxide is a non polar solvent as it is formed by covalent bonding and non polar solvents only dissolves compound formed by covalent bonding

Basically, the principle is that LIKE dissolves LIKE

Some key terms to help you understand:
IONIC BONDING: bonding between one metal and one non metal by complete transfer of electrons
COVALENT BONDING: bonding between non metals by sharing of electrons
POLAR SOLVENTS: formed by ionic bonding
NON- POLAR SOLVENTS: formed by covalent bonding

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Answer 2

Sodium Hydroxide is commonly known as caustic soda.

The chemical formula of sodium hydroxide is NaOH.

Sodium Hydroxide is very important basic chemical which is used as a starting material for making many other chemicals.

It is used in many industries and hence produced on large scale.

Sodium hydroxide is produced by the electrolysis of a concentrated aqueous solution of brine.

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