1. Tooth decay starts when the H of the mouth is lower than _____.

Question

Fill in the blanks:

1. Tooth decay starts when the H of the mouth is lower than ____.
2. The atmosphere of Venus is made  of thick white and yellowish clouds of _______acid.
3. Salts are ______neutral. 
4. Beds of rock salts are formed when seas of _________ages dried up. 
5. Sodium hydrogen carbonate is used in ______acid fire extinguishers. 
6.  Washing soda is used in the manufacture of _______. 
7. Salts have various uses in everyday life and in ______.

Answer 1

1. Tooth decay starts when the H of the mouth is lower than 5.5.
2. The atmosphere of Venus is made  of thick white and yellowish clouds of sulphuric acid.
3. Salts are electrically neutral.
4. Beds of rock salts are formed when seas of bygone ages dried up. 
5. Sodium hydrogen carbonate is used in soda acid fire extinguishers. 
6.  Washing soda is used in the manufacture of borax. 
7. Salts have various uses in everyday life and in industries.