A test tube containing molasses solution and yeast is kept in a warm place overnight. The gas collected from this mixture

A student took four test tubes containing solutions of different colours marked I,II, III and IV as shown here. The test tubes containing copper sulphate solution and ferrous sulphate could be the tubes:

A group of students carried out electrolysis of acidified water in the laboratory. By the end of the experiment two gases were collected in the test tubes at both the electrodes. The gas collected in one test tube is double the volume of gas collected in the other. Name this gas. Give reason for your answer.

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 gaseous mixture of ethane, ethene, and ethyne is passed into an ammoniacal AgNO_3 solution. The gas that escapes from the solution is expected to contain

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

A student added a piece of zinc metal each to four different test tubes containing different solutions as given below. The test tube in which no reaction was observed, contains