Question

ompound
+ Zn
+ HCI
- СНСОН
A + Hug)
B + H2O
C + H2O
30. Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1,11,7
and 9 respectively. Which solution is (a) neutral (b) strongly alkaline (c) strongly acidic (d)
weakly acidic (e) weakly alkaline.
51. Arrange the pH in increasing order H-ion concentration. [2010 (T-1)]
52. (a) An element X'on reacting with oxygen forms an oxide X20. The oxide dissolves in water
and turns blue litmus red. Predict the nature of the element whether metal or nonmetal?
53. (A solution of copper sulphate was kept in an iron pot. After few days, the pot developed some
holes in it. How will you account for this.
54. Tooth enamel is one of the hardest substance in our body. How does it undergo damage due to
the eating of chocolates and sweets? What should we do to prevent it? [2010 (T-1)]
55. What do you mean by Olfactory indicators?
56. Zinc is an amphoteric metal. Justify with reaction.
57. You have been provided with three test tubes. One of them contains distilled water and the
other two contain an acidic solution and a basic solution respectively. If you are given only red
litmus paper, how will you identify the contents of each test tube? [2010 (T-1)]​

Answer 1

I don't know

if know plz tell me also