General
✓✗Rock salt is normally brown in colour due to presence of
- Iron salts
- Copper salts
- Mud
- Impurities
General
✓✗Anhydrous copper sulphate can be used to detect moisture because -
- it will dissolve
- it will turn blue
- it will turn green
- it will evaporate
General
✓✗The compounds formed during electrolysis of brine is
- Cl2
- H2
- NaOH
- All of these
General
✓✗The indicator which produces a pink colour in an alkaline solution is
- methyl orange
- turmeric paper
- phenolphthalein
- litmus paper
General
✓✗An acid used in lead storage batteries is
-
-
- HCl
-
General
✓✗Which one of the following is heated at a temperature of 100°C to obtain Plaster of Paris?
General
✓✗Dead burnt plaster is formed if gypsum is heated above
- 100°C
- 200°C
- 50°C
- 150°C
General
✓✗A milk man adds a very small amount of baking soda to fresh milk. This is to ____
- increase the rate of fermentation
- decrease the rate of fermentation
- increase its quality
- increase its quantity
General
✓✗Ant sting injects
- formic acid
- methanoic acid
- both ‘a’ and ‘b’
- none of these
General
✓✗The safest way to dilute a concentrated acid is
- to add cold water in to the beaker of concentrated acid
- to add concentrated acid in to a beaker of cold water
- to add water and concentrated acid in to a beaker together
- to add hot water into a beaker of concentrated acid