Question

11. Arrange the following in increasing order of their pH values:
NaOH solution, Blood, Lemon juice
12. Name the gas evolved, when dilute sulphuric acid acts on sodium carbonate.
13. What is the colour of methyl orange in baking soda solution?
14. Name the metals soluble in aqua regia.
15. Why does HCig) does not conduct electricity when dissolved in toluene?
16. Which chemical is present in enamel?
17. Why does tooth decay occurs?​

Answer 1

Explanation:

ans 11- lemon juice,blood,NaOH solution. this is correct sequence.

ans 17-when ph goes below 5.5