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Bases

If pH of a su...

Question

If pH of a substance is greater than 7, it is acidic in nature

A

True

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B

False

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Solution

The correct option is B False

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Q. Fill in the following blanks with suitable words:
(a) Acids have a pH...........than 7.
(b) Alkalis have a pH.............. than 7.
(c) Neutral substances have a pH of ................
(d) The more acidic a solution, the ................. the pH.
(e) The more alkaline a solution, the............... the pH.

Q. Methyl orange changes its colour to _______ if the pH of the substance is greater than 7.

p H

values of certain familiar substances are given below:

Substance	$p H$ value
Blood	7.4
Baking Soda	8.2
Vinegar	2.5
Household ammonia	12

Analyse the data in the table and answer the following questions
i) Which substances are acidic in nature?
ii) Which substances are basic in nature?

Q. The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. It is carefully regulated by a number of homeostatic mechanisms, which exert their influence principally through the respiratory system and the urinary system in order to control the acid-base balance and respiration. What is the normal pH level of blood of a normal person?

If the pH value of a substance is below seven then it is ______ in nature.

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