Question

Few statements regarding the properties of bases are as follow:
I) NaOH and KOH are bases as well as alkalis.
II) Zn(OH), and Cu(OH), are bases as well as alkalis.
III) All metallic oxides give salt and water with alkalis.
The incorrect statement(s) is/are
a) Only 1
b) II and III
c) I and III
d) Only III​

Answer 1

OPTION A is the correct answer.........

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Answer 2

The incorrect statement is (b) II and III.

Statement (II) states that Zn(OH), and Cu(OH), are bases also as alkalis. this is often incorrect.

• Zn(OH), and Cu(OH), are bases but they're not alkalis as they are not soluble in water.

• So, the alkalis are those bases which will be dissolved in water.
• If the bottom is insoluble in water then it is not an alkali.

Statement (III) states that each one metallic oxides give salt and water with alkalis. This is often incorrect.

• All metallic oxides are already basic in order that they do not react with alkalis.

Statement (I) states that NaOH and KOH are bases also as alkalis.

• This is the correct statement.

• NaOH may be a strong base, and when it's dissolved in water, it dissociates into sodium cation and hydroxyl anion. Being a robust base it dissociates completely. The reaction is given below:

       NaOH→Na++OH−NaOH→Na++OH−

• So, it's an alkali.
• KOHKOH is additionally a strong base. When it's dissolved in water, it dissociates into potassium cation and hydroxyl anion. Being a robust base it dissociates completely. The reaction is given below:

       KOH→K++OH−KOH→K++OH−

• So, it's an alkali.

So , statement II and III are incorrect.

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