Which of the following ingredients is of sour taste and turns blue litmus into red?

Question

Question

This question was previously asked in

RPF Constable (2018) Official Paper (Held On: 03 Feb, 2019 Shift 2)

Answer 1

The correct answer is Acid.

Key Points

Concept:

In chemistry, organic and inorganic substances can be classified as acids, bases, and salts.
This classification is grounded on certain properties unique to each kind.
A litmus paper is an indicator that is used to identify the acidic and basic solutions.

Explanation:

A litmus paper is a special paper that is stained with a litmus solution.
Litmus solution has the property to turn red under acidic conditions and blue under basic conditions.
When a blue litmus paper is treated with an acid, it turns red in color.
When a red litmus paper is treated with a base, it turns blue in color.

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Additional Information

Acid	Base
Arrhenius acid: Any substance that carries a readily removable proton (H+ ion) is identified as an Arrhenius acid. For example, HCl, H2SO4, and HNO3.	Arrhenius base: Any substance that carries a readily removable hydroxide (OH- ion) is identified as an Arrhenius base. For example, NaOH, KOH, and Mg(OH).
Bronsted-Lowry acid: Any substance that readily gives away a proton (H+ ion) in an aqueous medium is identified as a Bronsted-Lowry acid. For example, HCl, H2SO4, and HNO3.	Bronsted-Lowry base: Any substance that readily accepts a proton (H+ ion) in an aqueous medium is identified as a Bronsted-Lowry base. For example, NH3, and CH3OH.
Lewis acid: Any substance that readily accepts electron pair is identified as a Lewis acid. For example, AlCl3, FeBr3, etc.	Lewis base: Any substance that readily gives away its electron pair is identified as a Lewis base. For example, FeCl3, etc. H2O, NH3, OH-, etc.