Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH
solution respectively. In which test tube a colour change will be observed? State the
colour change and give its reason.

Sarthak took two test tubes, A and B containing pale green solutions and blue respectively. Respective solutions taken in A and B are

Zinc pieces were placed in each of the four test tubes containing different salt solutions as shown below: In which cases will colour change be observed in solutions?

A student addd few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, the added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why ?

A student addd few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, the added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate. In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why ?

Four test tubes were taken and marked A, B, C and D respectively. 2 mL of solution of Al_(2)(SO)_(3) in water was filled in each of the four test-tubes. Clean piece of metal zinc was placed in test tube A, clean iron nail was put in test tube B, clean copper wire was placed in test tube C and a clean aluminium wire was placed in test tube D. What colour change would you observe in all the four tubes ?

You are provided with three test tubes containing distilled water, an acid and a base solution respectively. If you are given only blue litmus paper, how do you identify the contents of each test tube ?

You are provided with three test tubes A, B and C which contain distilled water, acidic solution and basic solution respectively. If you are given blue litmus paper only, how will you identify the contents of each test tube ?