NDA CHEMISTRY QUIZ - 25

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Question 1:

DIRECTIONS: Read the following two statements and choose the correct answer. 

Statement 1 – Tooth enamel is the hardest substance in the human body

Statement 2 – Chemical formula of tooth enamel is calcium hydroxyapatite .

Question 2:

Bases turns -------litmus solution ---------

Question 3:

Two sample of soil are there , soil A and soil B .pH of soil A is found to be 5 and that of soil B is 7 .In which soil farmer should add lime ?

Question 4:

There are two solutions A and B . The pH of A solution is 6 and that of B solution is 8 .Which solution has more hydroxide ions?

Question 5:

What will be the reaction when base dissolves in water ?

Question 6:

When a base reacts with a metal , which one of the following gas is usually liberated?

Question 7:

Among NaOH , Ca(OH)2 and Mg(OH)2 , ------- is a weak base .

Question 8:

25 mL of water is added in an acidic solution . This result in 

Question 9:

Which of the following statement is incorrect about bases?

Question 10:

The life of aquatic animal is in danger if pH of the water is-