1. Magnesium hydroxide is
A. Acidic
B. Basic
C. Neutral
D. Both acidic and basic
2. Which gas is evolved when zinc reacts with dilute hydrochloric acid?
A. Hydrogen
B. Carbon dioxide
C. Oxygen
D. Nitrogen
3. Which of these cannot prevent rusting of iron?
A. Galvanization
B. Alloying
C. Dipping in water
D. Greasing

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Solution

Dear student,

1) Magnesium hydroxide is (B) Basic because it generates OH^- ions in the presence of water.

2) When zinc reacts with hydrochloric acid (A) hydrogen gas is evolved.
Zn + 2HCl → ZnCl₂ + H₂

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Q. Zinc metal is added to dilute hydrochloric acid. The gas evolved is :
(a) Oxygen
(b) Hydrogen
(c) Chlorine
(d) Carbon dioxide

Q. From the metals-copper, iron, magnesium, sodium and zinc-select a different metal in each case which :
(a) does not react with dilute hydrochloric acid.
(b) can form 2⁺ and 3⁺ ions.
(c) has a hydroxide that reacts with both acids and alkalis.
(d) does not react with cold water, but reacts with steam when heated.

Q. When zinc reacts with dilute hydrochloric acid, the gas evolved is:

From the metals: copper, iron,magnesium, sodium, and zinc, select a different metal in each case which:

(a) does not react with dilute hydrochloric acid,

(b) can form $2^{+}$ and $3^{+}$ ions,

(d) does not react with cold water but reacts with steam when heated.

(e) Arrange the above metals in their decreasing order of reactivity.

From the metals copper, iron, magnesium, sodium and zinc, select a different metal in each case which:
(i) does not react with dilute hydrochloric acid.
(ii) can form 2+ and 3+ ions.
(iii) has a hydroxide that reacts with both acids and alkalis.
(iv) does not react with cold water but reacts with steam when heated.
Arrange the metals in increasing order of reactivity.

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