Question

All the X are Y but all Y are not X. What are X and Y?

• A. X-Alkalis, Y-Bases
• B. X-Bases, Y-Alkalis
• C. X-Oxides, Y-Acids
• D. X-Acids, Y-Alkalis

Answer 1

The correct option is A

X-Alkalis, Y-Bases

Bases exhibit certain characteristic properties such as -

• They react with acids to form salts.
• Their solution changes the colour of indicators (e.g., turns red litmus paper blue).
• They are bitter in taste.
• Their solution has pH>7.

They are usually metal oxides, metal hydroxides, metal carbonates or metal hydrogen carbonates.
Those bases that are soluble in water are known as alkalis. For example- NaOH, KOH. Therefore, all alkalis are bases but all bases are not alkalis.