Which of the following statements are correct?
I. The tangy taste of cola drinks is due to carbonic acid which is an organic acid.
II. Inorganic acids are prepared artificially in industries and are extremely corrosive.
III. Hydrofluoric acid reacts with metals to varying degrees. Therefore, it is stored in glass bottles.
IV. Organic acids are weak acids and are used as food supplements.

Study the given Venn diagram carefully.

Identify 1,2 and 3.

Ishaan tested the nature of a few common substances with different indicators and recorded his observations as follows:

Substance $\mathrm{P}$ turned methyl orange yellow.

Substance $\mathrm{Q}$ turned phenolphthalein colourless.

Substance $\mathrm{R}$ did not have any effect on blue or red litmus.

Substance $\mathrm{S}$ turned China rose indicator green.

$\mathrm{P}, \mathrm{Q}, \mathrm{R}$ and $\mathrm{S}$ could be respectively.

A science teacher has arranged the following sets of test tubes as follows. 

She asked the students to find out the incorrect statement about the above experimental set-up.

Consider the following statements (l-l V) and fill in the blanks by selecting the appropriate option.
I. An antacid such as $\mathrm{P}$ is used to cure indigestion.
II. Lime water contains $\mathrm{Q}$ , which turns milky with carbon dioxide.
III. Soap solution is basic due to the presence of $\mathrm{R}$. It turns the turmeric stain of the shirt to red.
IV. Baking soda is $\mathrm{S}$ which reacts with vinegar to evolve carbon dioxide gas.