CBSE Class-10 Science: Questions 87 - 93 of 117
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Question number: 87
Write in Short
A road tanker carrying an acid met with an accident and its contents spilled on the road. At the side of the road, iron drain covers began melting and fizzing as the acid ran over them. A specialist was called to see if the acid actually leaked into the nearby river.
(a) Explain how the specialist could carry out a test to see if the river water is contaminated with acid.
(b) The word melting is incorrectly used in the report. Suggest a better name that should have been used.
(c) Explain why drain covers began fizzing as the acid ran over them.
Question number: 88
Question number: 89
Describe in Detail
What are the basis to classify acids into several categories?
1. On the basis of their strength, acids are classified as:
Strong acids: Acids which completely dissociate into its ions in aqueous solutions. Example: nitric acid (HNO3) , sulphuric acid (H2SO4), hydrochloric acid (HCl).
Weak acids: Weak acids are those acids which… (180 more words) …
Question number: 90
Question number: 91
Question number: 92
Question number: 93
Write in Short
A, B and C are three elements which reacts chemically in the following way
A2O3 + 2B → B2O3 + 2A
3CSO4 + 2B → B2 (SO4) 3 + 3C
3CO + 2A → A2O3 +3C
Answer the following
(A) Which element is most reactive?
(B) Which element is least reactive?