Action of Water on Metals

Q.

Fill in the blank: Gold is _______ precious metal.

Q. Copper reacts vigorously with water and forms hydrogen gas.

1. True
2. False

Q.

Give reason : Graphite is used as a lubricant?

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

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

Q.

In which Block Non-Metals are Found?

Q.

What do you observe when:

Carbon dioxide is heated with coke?

Q.

Name two metals that are the best conductors of heat.

Q. What is the first rare earth metal?

Q.

A boy sharpens a pencil at both the ends and then uses its black ends to complete an electrical circuit. Will the current flow through the electrical circuit? Give reason for your answer. Name the black substance of the pencil.

Q.

Which of the following reacts vigorously with cold water?

1. Sodium (Na)

2. Calcium (Ca)

3. Aluminium (Al)

4. Zinc (Zn)

Q.

74(i) Name the metal which is used in manufacture of high voltage electric transmission wire.

Q. will react with dilute hydrochloric acid to form salt and hydrogen gas.

1. Silver
2. Aluminium
3. Gold

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

Q. Which property of metals is used to make wrappers of the chocolate in the following image?

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. Calcium on reacting with water begins to float.

1. False
2. True

Q. Which is the metal that doesn't react with any form of water?

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

Q. Metals react with _______ to form metal oxides.

1. Oxygen
2. Sulphur
3. Hydrogen
4. Carbon

Q. Metals react with _______ to form metal oxides.

1. Oxygen
2. Sulphur
3. Hydrogen
4. Carbon

Q.

Give reasons for the following.​
Sodium and potassium are stored in kerosene. ​

Q.

Name the following:

A good electrical conductor which is a nonmetal

Q.

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

1. True

2. False

Q.

Choose the correct option to complete the following equation.
Magnesium + Cold water $\to$ ____

1. Rust

2. Magnesium hydroxide

3. Magnesium oxide

4. No reaction

Q. Sodium is stored in ___ to prevent it from reacting with oxygen and water vapour.

1. Kerosene
2. Vegetable oil
3. Mercury
4. Ethanol

Q. Which among the following metals does not react with water at ordinary temperature?

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

Q.

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

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

Q. Why zinc have high lionisation energy