General
✓✗Name the non metal which is extremely hard
- Graphite
- Diamond
- Sulphur
- Phosphorus
General
✓✗Stainless steel is an alloy of Iron with
- Carbon
- Chromium and Nickel
- Lead and Tin
- Copper
General
✓✗Out of aluminium, copper, calcium and tin, the most reactive metal is
- aluminium
- copper
- tin
- calcium
General
✓✗Calcination is heating of ore in
- sufficient supply of oxygen
- limited supply of oxygen
- absence of oxygen
- excess of pure oxygen
General
✓✗Aluminium metals starts to look dull over a period of time due to formation of a layer of
- Aluminium carbonate
- Aluminium hydroxide
- Aluminium oxide
- Aluminium sulphide
General
✓✗In stainless steel alloy, iron metal is mixed with
- Cu and Cr
- Cr and Ni
- Cr and Sn
- Cu and Ni
General
✓✗An element ‘X’ reacts with water to form a solution which turns phenolphthalein solution pink. The element ‘X’ is most likely to be
- S
- Ca
- C
- Ag
General
✓✗Alloy is an example of
- colloidal solution
- solid solution
- emulsion
- gel
General
✓✗Non-metal chlorides are
- ionic compound
- covalent compound
- Both ‘a’ and ‘b’
- None of these
General
✓✗The metal reacting readily with cold water is_____
- Au
- Ag
- Na
- Mg