Reaction of Metals with Water

Q.

The reaction of sodium metal is found to be highly explosive. Comment.

Q. Question 37
Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in the reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.

Q.

Three metals X, Y and Z are given. X reacts with cold water, hot water and steam. Y reacts with hot water and steam and Z reacts with steam only. Identify X, Y, and Z from the below options.

1. X:- Sodium

   Y:- Zinc

   Z:- Magnesium

2. X:- Copper

   Y:- Magnesium

   Z:- Zinc

3. X:- Magnesium

   Y:- Zinc

   Z:- Potassium

4. X:- Sodium

   Y:- Magnesium

   Z:- Zinc

Q.

Oxides of Metals are:

1. Acidic

2. Basic

3. Both basic and amphoteric oxides.

4. Amphoteric oxides

Q. A metal $X$ does not react with cold water but reacts with hot water to form its hydroxide.Metal $X$ is more reactive than iron but less reactive than sodium.
Metal $X$ is:

1. Zinc
2. Magnesium
3. Calcium
4. Aluminium

Q.

Which of the following oxides is acidic in nature?

1. Sodium Oxide

2. Iron Oxide

3. Calcium Oxide

4. Sulphur Dioxide

Q. A metal 'X' reacts readily with the oxygen in the air but does not react with cold or hot water. The metal 'X' can be:

1. sodium
2. magnesium
3. iron
4. potassium

Q. Which metal will not react with oxygen at high temperature
a. Zn. b. Ag c. Fe d. Al

Q. Question 2
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Q. A metal 'X' reacts readily with the oxygen in the air but does not react with cold or hot water. The metal 'X' can be:

1. sodium
2. magnesium
3. potassium
4. iron

Q. What are the COMMON NATURES and SIMILARITIES of Metal Oxides and Non-metal Oxides ?

Q. Why does calcium float in water?

Q. Sodium and potassium react violently with cold water.

1. False
2. True

Q. Which of these reactions release a gas which burns with a pop sound?

1. $CaC{O}_3+H_{2}S{O}_4$
2. $Cu+HCl$
3. $K+HCl$
4. $NaOH+H_{2}S{O}_4$

Q. What are the COMMON NATURES and SIMILARITIES of Metal Oxides and Non-metal Oxides ?

Q. Non-metals don't usually react with water but non-metal oxides do.

1. True
2. False

Q.

Compare the properties of a typical metal and a non-metal on the basis of the following:

Nature of the oxides

Q. Which of the given metals exhibits both reactions (a) as well as (b)?

(a) Metal + Oxygen $\to$ Metal oxide

(b) Metal + Cold water or hot water or steam $\to$ Metal hydroxide + Hydrogen

1. Magnesium (Mg), iron (Fe), sodium (Na), and copper (Cu)
2. Copper (Cu), magnesium (Mg), gold (Au), and sodium (Na)
3. Magnesium (Mg), zinc (Zn), platinum (Pt), and gold (Au)
4. Sodium (Na), potassium (K), magnesium (Mg) and calcium (Ca)

Q. Option 20
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
a) $\text{Mg}$
(b) $\text{Ag}$
(c) $\text{Zn}$
(d) $\text{Cu}$

Q. Which acid is used in the laboratory preparation of zinc sulphate and ferrous sulphate salts?

Q. Why is phosphorus stored in water?

1. It is very reactive.
2. It does not react with water.
3. It reacts with air and catches fire.
4. All of the above

Q. what is the nature of oxide formed by SiO2

Q. Which of the following reacts with oxygen on strong heating but not with water?

1. Magnesium
2. Copper
3. Gold
4. Sodium

Q. When calcium is immersed in water, it starts to .

1. float
2. sink
3. disappear

Q. Which of the following metals do not react with cold water?

1. Gold
2. Platinum
3. Silver
4. Calcium

Q. Question 2
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

Q.

When a metal is put in water it starts floating and some gas is evolved from it without any fire. A burning candle is put off with a pop sound when a candle is exposed to this gas. The metal can be ____ .

1. potassium

2. magnesium

3. lithium

4. iron

Q. Metals always form basic oxides. Why is this statement incorrect?

Q. Match the following elements with their reactivity based on reaction with cold water.

1. Inert
2. Highly reactive
3. Moderately reactive
4. Less reactive

Q. Statement I:- Hydrogen gas is not evolved when zinc reacts with cold water.

Statement II:- Sodium reacts vigorously with cold water to produce sodium hydroxide and hydrogen gas.

1. Only statement I is true.
2. Only statement II is true.
3. Both statements are true.
4. Both statements are false.