General
✓✗The metals which are extracted by electrolysis are
- Na & K
- Al
- Ca
- All
General
✓✗Which of the following reaction is possible?
General
✓✗Non metal sulphur is present in
- Onion and garlic
- Hair
- Wool
- All
General
✓✗In the extraction of copper, when molten copper is cooled slowly, blister copper is obtained due to the evolution of
- Water vapour
- Sulphur dioxide
- Carbon monoxide
- Carbon dioxide
General
✓✗The least reactive metal among the following is
- sodium
- silver
- copper
- lead
General
✓✗24 ‘Carat’ gold is mixed with other metals because
- Pure gold is very hard
- Pure gold is very soft
- Pure gold not bright yellow
- Pure gold is very expensive
General
✓✗Which of following oxides of nitrogen is known as laughing gas?
- N2O
- NO
- N2O5
- NO2
General
✓✗
In the above reaction:
In the above reaction:
- sulphuric acid is an oxidizing agent and sulphur is a reducing agent
- sulphuric acid is a reducing agent and sulphur is an oxidizing agent
- both are oxidizing agents
- both are reducing agents
General
✓✗Which of the following metal exists in the liquid state?
- Na
- Ag
- Cr
- Hg
General
✓✗Corrosion of copper is due to the deposition of
- acidic copper carbonate
- basic copper carbonate
- neutral copper carbonate
- none of these