Question 2 :
<p>An acid is a compound which when dissolved in water yields:</p>

Question 3 :
If tartaric acid is not added in baking powder, the cake will taste bitter due to te presence of -

Question 5 :
Indicator is a substance which shows different colors in acidic and basic solutions.

Question 7 :
The substances which give different colours with acid and base are called __________ .

Question 13 :
To protect tooth decay, we are advised to brush our teeth regularly. The nature of the toothpaste commonly used is __________in nature.<br/>

Question 14 :
Substances containing hydroxide ion are the only ones considered as bases.

Question 18 :
<table class="table table-bordered"><tbody><tr><td> Indicator</td><td> pH range</td></tr><tr><td> Methyl violet</td><td> 0.3-1.8</td></tr><tr><td> Methyl orange</td><td> 2.8-3.8</td></tr><tr><td> Congo red</td><td> 2.8-4.8</td></tr><tr><td> Methyl red</td><td> 3.8-6.1</td></tr><tr><td> Bromothylmol blue</td><td> 6.0-7.9</td></tr><tr><td> Phenol Red</td><td> 6.8-8.6</td></tr></tbody></table>The table above shows the pH ranges of some common indicators. Given that $K_{a}$ is $7.3 \times 10^{-10}$ for boric acid $(H_{3}BO_{3})$, Choose an indicator that can be used for the titration of $0.10 M KH_{2}BO_{3}$ with 0.10 M HCl.<br/>

Question 19 :
Identify the species which can give both conjugate acid and conjugate base.