The acid which is produced in the stomach helps in digestion of food is
HNO3
H2SO4
HCl
H2S2O7
When NaCl is electrolysed , the gas liberated at anode is
H2
O2
Na
Cl2
When the pH value is less than 7 , then the solution is
Basic
Natural
Salt
Acidic
An example for natural indicator is
Turmeric
Methyl orange
Eosin
Phenolphthalein
The strength of basic substance is represented by
pH
POH
Pavling scale
PS
Phenolphthalein is a
Natural indicator
Olfactory indicator
Synthetic indicator
Universal indicator
The pH of human blood is
7
7.3
7.5
6.5
Rock salt is
Pure NaCl
Impure NaCl
10% NaCl
NaCl crystals
Hardness of water is due to the presence of chlarides and sulphate of
Tin and lead
Calcium and Magnesium
Barium and Gallium
Na and K
Washing soda is
NaHCO3
Na2CO3
Na2SO4
NaCl
