A student working in the laboratory added some water to a syrupy liqiud taken in a tube. The tube immediately cracked and the liquid which escaped out of it, produced blisters on the skin of the student. What actually happened ?

While working in a chemistry laboratory, a student took some zinc granules in a test-tube and added a liquid X to it. A gas Y was produced. When a buring matchstick was brought near the mouth of the test-tube , the gas Y burns with a ' pop' sound, making a little explosion. (a) What could the liquid X be ? (b) Name the gas Y. (c) State two properties of gas Y.

About 10 mL water is taken in a test tube. To this nearly 10 mL of acetic aciid are added. which out of the following will be the correct observation?

What happens when a small amount of baking soda is taken in a test tube and some dilute hydrochloric acid is added to it ?

The experiments conducted by two students are given below. Experiment 1: 2mL of sodium thiosulphate solution is taken in a test tube, heated and to it 2 mL of HCl solution is added. Experiment 2: 2 mL of sodium thiosulphate solution is taken in a test tube and to it 2 mL of HCl solution is added. In which experiment is the precipitate formed quickly ? justify your answer.

A student performed following two activities in school laboratory: Activity 1: Addition of zinc dust into copper sulphate solution taken in a test tube. Activity 2: Addition of an iron nail into copper sulphate solution taken in a test tube. He noted down his observations and concluded that chemical reaction occurs in both the cases based on the observed colour change of the resulting solution. What was the initial colour of the solution?

A student performed following two activities in school laboratory: Activity 1: Addition of zinc dust into copper sulphate solution taken in a test tube. Activity 2: Addition of an iron nail into copper sulphate solution taken in a test tube. He noted down his observations and concluded that chemical reaction occurs in both the cases based on the observed colour change of the resulting solution. What are the products formed in Activity 2?

A student dipped a strip of pH paper in distilled water taken in a tube. As expected, the pH paper acquired green colour. He then dissolved a pinch of common sale in the same tube. What will be the expected change in colour of the pH paper ?