Question 1 :
Phenolphthalein gives a pink colour in alkalinate medium due to the fact that:

Question 3 :
Lalita has taken sulphur powder $(P)$ in a deflagrating spoon, burnt it and put it in a gas jar. Then she removed the spoon and added water. In another experiment, she has taken water in one beaker and added a small piece of sodium $(Q)$. After some time, she took both the solutions and checked them with litmus paper. What result would she expect?

Question 4 :
A solution of which substance can best be used as both titrant and its own indicator in an oxidation-reduction titration?

Question 5 :
Which solution is a conjugate acid/base pair with differing spectral absorbencies?&#160;<br/>

Question 6 :
In the titration of $K_{2}Cr_{2}O_{7}$ iodometrically, near the end point the colour of the solution becomes:

Question 7 :
Indigestion is painful so to relieve indigestion, we take anantacidsuch as milk of magnesia , which<br>contains :