Multiple Choice Questions (MCQs)

A student prepared hydrogen chloride gas by treating sodium chloride with concentrated sulphuric acid in test-tube. He held a strip of dry blue litmus paper in $\mathrm{HCl}$ gas coming out of the test-tube. The student observed that on coming in contact with $\mathrm{HCl}$ gas, the colour of blue litmus paper:

When a student added a few drops of barium chloride solution to sodium sulphate solution, he obtained a white precipitate instantly. Which of the following type of chemical reaction has been carried out by the student?

In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below:

The solution having lowest pH value is :

A student measured the pH values of four solutions A, B, C and D which were found to be $4, 1, 13$ and $11$ respectively. Which of the following statements are correct about these solutions?
(a) A is strong acid and B is weak acid
(b) B is strong acid and D is weak base
(c) D is strong base and C is weak base
(d) C is strong base and A is weak acid

When a student put some copper turnings in a colourless solution, he observed that the solution gradually turned blue. The solution is most likely to be:

A student added blue litmus solution to a colourless aqueous solution. The solution turned red. Which one of the following chemicals should be added in excess so that the change in colour is reversed?

Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.

The correct set of observations have been recorded by the student:

A student was given three solutions marked X, Y and Z, and asked to arrange them in the increasing order of their pH values. The student put two drops of each solution on three strips of universal indicator paper separately. The colours shown by the three indicator strips are as follows:

Which of the following gives the correct order of increasing pH values.