Question

1 a student added dilute HCL to the test tube containing zinc granules what will be the colour of surface of zinc after the reaction

2 what happens when HCL is added to sodium hydrogen carbonate what will happen if excess of gas is throughsolution used for testing the gas

3 what happens to the solution of sodium hydroxide when phenolphthalein is added what is the colour formed how the colour formed when sodium hydroxide react with phenolphthalein changes when hydrochloric acid is added in the coloured solution in the type of reaction also

4 what happens when when a base react with HCl updates combines with carbon dioxide write it reaction also

Answer 1

1. It changes into brown colour, reddish brown colour. 2. It will give more heat and can blast also. 3. It will change into faddy colour. 4. Base+Acid ---> Salt+Water