Acids, Bases and Salts (Set - I)

Equal volumes of hydrochloric acid and sodium hydroxide solutions with the same concentrations are mixed and the pH of the resulting solution is 7, because a neutral salt and water are formed. The colour of pH paper will be yellowish-green.

Correct Answer: H⁺ ion donor
Hence CH₃COOH is an Arrhenius acid. 

China rose extract is a natural indicator and turns acidic solutions dark pink and basic solutions green.

Arrhenius bases furnish OH^- ions in their aqueous solutions.
Bronsted-Lowry bases are proton acceptors.
NH₃ will not release OH^- ions, but accept a proton to form NH₄⁺.
Hence, NH₃ is a Bronsted-Lowry base, but not an Arrhenius base. 

All acids are electrolytes.
Strong acids are strong electrolytes and weak acids are weak electrolytes.
Hence, the statement 3 is false.

Turmeric turns reddish-brown in colour in the presence of a base.

C₂H₅OH is not a base. It is an alcohol. 
Alcohols are very weak acids but they are not bases.

Turmeric turns reddish-brown in colour in the presence of a base.

Sodium bicarbonate is the base. When methyl orange is added to sodium carbonate, it will give a yellow colour. 

Vanilla essence is an olfactory indicator, it will lose its flavor in basic solution. Out of the given, ammonium hydroxide is a base and thus, it will lose its flavor in NH₄OH.