Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest $pH$?

If the pair of lines $ax^2-7xy-3y^2=0$ and $2x^2+xy-6y^2=0$ have exactly one line in common and $a$ is an integer,then the equation of the pair of bisectors of the angles between the lines $ax^2-7xy-3y^2=0$ is

The process of caustification is used for the preparation of which of the following?

Curie temperature is the temperature above which

When $tert$-butyl bromide is heated with silver fluoride,the major product obtained is:

If $x$ is real,then the value of $\frac{x^2-3x+4}{x^2+3x+4}$ lies in the interval