Reaction of Metals with Water or Steam

Q.

Calcium reacts with water to form calcium hydroxide and hydrogen gas.

1. True

2. False

Q.

What happens when calcium is treated with water?

(i) It does not react with water

(ii) It reacts violently with water

(iii) It reacts less violently with water

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

1. (i) and (iv)

2. (ii) and (iii)

3. (i) and (ii)

4. (iii) and (iv)

Q.

Gold reacts with steam to liberate hydrogen gas.

1. True

2. False

Q.

Name the following:

(a) Two metals which give hydrogen with cold water.

(b) A metal which liberates hydrogen only when ste am is passed over red hot metal.

(c)The process in which oxygen is added or hydro gen is removed.

(d)A metallic oxide which can be reduced into metal by hydrogen.

Q.

Why aluminum is called a self protecting metal??

Q. Which of the following statements is not true with respect to the reactions of metals with oxygen, water and acid?

1. Gold generally does not react with oxygen, water and acid.
2. Sodium reacts explosively with water and acid.
3. Iron does not react with oxygen and water.
4. Magnesium reacts vigorously with acid and produces hydrogen gas.

Q. what is thermite reaction?why magnesium strip is used and not fire?

Q.

Explain the formation of metal hydrides from hydrogen.

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> A metal (M) is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue. (a) Name the metal (M). (b) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water.

Q.

Which of the following element starts to float when immersed in cold water?

1. Sodium
2. Calcium
3. Platinum
4. Potassium

Q.

Dry hydrogen when passed over heated metals like Na, K, and Ca, reacts to give their corresponding ______

Q.

What happens when calcium is treated with cold water?

(i) It does not react with cold water.
(ii) Hydrogen gas evolved catches fire.
(iii) Hydrogen gas evolved does not catch fire.
(iv) Calcium floats on the surface of the water.

Q. What happens when hydrogen reacts with metal oxides?

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

Q.

Complete and balance the following equations :

(a)$H_2+\cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \to 2HCl$

(b)$H_2+S\to \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

(c)$Zn+\cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \to ZnC{l}_2+H_2$

(d)$Cuo+\cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot \to Cu+\cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

(e)$Fe+H_{2}O\to +\cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

(f)$K+H_{2}O\to \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot +\cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot$

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. Which of the following is unaffected by both water and oxygen (air)?

1. Copper
2. Phosphorous
3. Silver
4. All of the above

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

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

Q.

What happens when Calcium reacts with water?

Q. When magnesium ribbon is burnt in the air it will form a compound X which is Y in colour. Identify X and Y.

1. X:- Magnesium oxide, Y:- Black
2. X:- Magnesium oxide, Y:- White
3. X:- Magnesium hydroxide, Y:- White
4. X:- Magnesium hydroxide, Y:- Pink

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

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

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. Metal reacts with to form metal oxide. The metal oxide formed is in nature.

Q. Which of the following reacts vigorously with cold water?

1. Sodium (Na)
2. Calcium (Ca)
3. Aluminium (Al)
4. Zinc (Zn)

Q. Select the correct options for the reaction of metals with cold water.

1. Potassium- Inert
2. Magnesium- Moderately reactive
3. Aluminium- Less reactive
4. Gold- Highly reactive

Q. Which among the following is most likely to react when kept in open air?

1. Copper
2. Gold
3. Potassium
4. Zinc

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

Q. Give reasons for the following.​

(a) Aluminium foils are used to wrap food items.​
(b) Immersion rods for heating liquids are made up of metallic substances
(c) Copper cannot displace zinc from its salt solution.​
(d) Sodium and potassium are stored in kerosene.​

Q. Sulphur dioxide $\left(S{O}_2\right)$ is a/an:

1. basic oxide
2. none of the above
3. acidic oxide
4. neutral oxide

Q. Which of the following metals reacts vigorously with cold water?

1. Sodium (Na)
2. Magnesium (Mg)
3. Aluminium (Al)
4. Zinc (Zn)