Metals react with dilute acids to give metal salts and
Water
Oxygen
CO2
H2
The soda commonly used in the kitchen for making tasty, crispy pakodas is
Caustic soda
Washing soda
Caustic potash
Baking soda
What happens when a CO2 fire extinguisher cylinder is inverted and the stopper is opened by pushing the plunger ?
An explosion takes place
CO2 will comes out
Water comes out
Nothing will happen
Acidity of ammonium hydroxide is -
1
2
4
3
The pH of Acid Rain is less than:
7
7.8
5.6
2.3
Bee-sting causes pain and irritation as it is
Acidic
Basic
Neutral
Salt
On heating gypsum at 373K, it loses water molecules and becomes___________.
Bleaching powder
Plaster of Paris
Bleaching powder is
Calcium oxychloride
Calcium bicarbonate
Calcium hydride
Calcium oxide
The substance which indicates the presence of acid or base by change of its smell is known as :
household indicator
acid-base indicator
olfactory indicator
none of these
Which is used for removing permanent hardness of water?
Sodium carbonate
Sodium bicarbonate
Sodium hydroxide
Potassium hydroxide