Chapter 5 Acids, Bases and Salts
- A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred. When litmus paper is dipped into 2 mL of dilute HCl solution , then blue litmus paper is turned into red colour and there is no effect on re... 1
- Two or three filings of copper were added to 10ml dilute nitric acid and stirred. Answer: Copper dissolves slowly, the solution turns blue (copper nitrate forms), and a colourless gas, nitric oxide (NO), is given off, whic... 1
- Two drops of the indicator phenolphthalein were added to 10ml solution of sodium hydroxide. When two drops of Phenolphthalein indicator are added to 10 mL solution of Sodium hydroxide, then the solution turns light pink in colour be... 1
- 50ml water is added to 50ml solution of copper sulphate. Write down the changes that will be seen in each Answer: The blue colour of the solution becomes lighter (paler); no chemical reaction takes place. Copper sulphate solution is blue because... 1
- Identify the odd one out and justify. (a) Chloride, nitrate, hydride, ammonium (a) Chloride, nitrate, hydride, ammonium Answer Ammonium - Ammonium is odd because Ammonium is cation and rest are anions. (b) Hydrogen chlo... 1