Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Arrange the pH in increasing order of hydrogen-ion concentration.

Plaster of Paris should be stored in a moisture-proof container. Explain why?

Give two important uses of washing soda and baking soda.

Equal lengths of magnesium ribbons are taken in test tubes $A$ and $B$. Hydrochloric acid ($HCl$) is added to test tube $A$, while acetic acid ($CH_3COOH$) is added to test tube $B$. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?

Fresh milk has a pH of 6. How do you think the pH will change as it turns into curd? Explain your answer.

What is a neutralisation reaction? Give two examples.

Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (b) strongly alkaline?

A milkman adds a very small amount of baking soda to fresh milk. (a) Why does he shift the pH of the fresh milk from 6 to slightly alkaline?

Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (c) strongly acidic?

Compounds such as alcohols and glucose also contain hydrogen but are not categorised as acids. Describe an Activity to prove it.

Which one of the following types of medicines is used for treating indigestion?

Why does distilled water not conduct electricity, whereas rain water does?

Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (e) weakly alkaline?

Why do acids not show acidic behaviour in the absence of water?

Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (d) weakly acidic?

10 mL of a solution of $NaOH$ is found to be completely neutralised by 8 mL of a given solution of $HCl$. If we take 20 mL of the same solution of $NaOH$, the amount $HCl$ solution (the same solution as before) required to neutralise it will be

Which of following set of substances contain acids?

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains

Five solutions $A, B, C, D$ and $E$ when tested with universal indicator showed pH as 4,1,11,7 and 9, respectively. Which solution is (a) neutral?

Write word equations and then balanced equations for the reaction taking place when – (a) dilute sulphuric acid reacts with zinc granules.