A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish – orange. Which of the following would change the colour of this pH paper to greenish blue
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place
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The water of crystallization of green vitriol is
If a few drops of a concentrated acid accidentally spill over the hand of a student, what should be done?
Which of the following gives the correct increasing order of acid strength?
Calcium phosphate is present in tooth enamel. Its nature is
Each volumes of solutions with pH = 4 and pH = 10 are mixed. What is the pH of the resulting solution?
Which among the following is not a base?
The acid used for washing eyes is
Which of the following are present in a dilute aqueous solution of hydrochloric acid?
A salt on treatment with excess of ammonium hydroxide produces a complex tetraammine copper (II) ions. The salt contains
When dilute hydrochloric acid is poured over powdered calcium carbonate, efflorescence are formed, it is because
What is pH of a solution whose hydrogen ion concentration is 1 × 10–3 M?
Which of the following substances will not give carbon dioxide on treatment with dilute acid?
13 videos|44 docs|187 tests
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13 videos|44 docs|187 tests
|