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

A milkman adds a very small amount of baking soda to fresh milk. (b) Why does this milk take a long time to set as curd?

A solution turns red litmus blue, its pH is likely to be

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

The correct way of making a solution of acid in water is to

Give two important uses of washing soda and baking soda.

Phenolphthalein is a synthetic indicator and its colours on acidic and basic solution, respectively are

Write word equations and then balanced equations for the reaction taking place when – (c) dilute sulphuric acid reacts with aluminium powder.

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 (e) weakly alkaline?

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.

Write word equations and then balanced equations for the reaction taking place when – (b) dilute hydrochloric acid reacts with magnesium ribbon.

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?

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

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

Litmus a natural dye is an extract of 

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

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?

Write word equations and then balanced equations for the reaction taking place when – (d) dilute hydrochloric acid reacts with iron filings.

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?