From the list given below, select the word(s) required to correctly complete the blanks (i) to (v) in the following passage:
Ammonia, Ammonium, Carbonate, Carbon dioxide, Hydrogen, Hydronium, Hydroxide, Precipitate, Salt, Water.
A solution 'X' turns blue litmus red so it must contain (i) ____ ions; another solution 'Y' turns red litmus blue and therefore must contain (ii) _ ions. When X and Y are mixed together, the products will be a (iii) and (iv) _. If a piece of magnesium was put into solution X, (v) ____ gas would be evolved.

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Solution

A solution 'X' turns blue litmus red, so it must contain hydronium ions; another solution 'Y' turns red litmus blue and therefore must contain hydroxide ions. When X and Y are mixed together, the products will be a salt and water. If a piece of magnesium was put into solution X, hydrogen gas would be evolved.

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Similar questions

Q. From the list given below, select the word(s) required to correctly complete the blanks (i) to (v) in the following passage:
Note: words chosen from the list are to be used only once. Write only the answers. Do not copy the passage. [reddish brown, ammonium, nitrogen dioxide, hydroxyl, dirty green, ammonia, acidic, alkaline]
Nitrogen and hydrogen combine in the presence of a catalyst to give (i) ________ gas. When the above mentioned gas is passed through water it forms a solution which will be (ii) ________ in nature and the solution contains (iii) ______ ions and (iv) _______ ions. The above solution when added to iron (II) sulphate solution gives a (v) _______ coloured precipitate of iron (II) hydroxide.

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:

(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside
(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :

Q. If a piece of magnesium was put into a solution M, (v) ................... gas would be evolved.

Q. An aqueous solution of a gas

(X)

shows the following reactions.
(i) It turns red litmus blue.
(ii) When added in excess to a

C u S O_{4}

solution, a deep blue colour is obtained.
(iii) On addition of

F e C l_{3}

solution, a brown precipitate soluble in dilute

H N O_{3}

is obtained.
Then the gas

(X)

will be :

Question 10.
Sodium hydrogen carbonate, when added to acetic acid, evolves a gas. Which of the following statements are true about the gas evolved?
(i) It turns lime water milky
(ii) It extinguishes a burning splinter
(iii) It dissolves in a solution of sodium hydroxide
(iv) It has a pungent odour

(a) (i) and (ii)
(b) (i), (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) (i) and (iv)

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