Reaction of Metals with Water

Q. The products formed when sodium reacts with cold water are:

1. sodium oxide
2. sodium hydroxide
3. hydrogen gas
4. water

Q.

Why sodium reacts with water

Q.

When phosphorus burns in air, it forms an acidic oxide.

1. True

2. False

Q. When metal X reacts with dilute $\text{HCl}$ then bubbles of gas Y are formed. Moreover, when this metal X reacts with cold water it will again produce this gas Y. Identify X and Y.

1. X:- Calcium, Y:- Oxygen
2. X:- Potassium, Y:- Oxygen
3. X:- Sodium, Y:- Hydrogen
4. X:- Copper, Y:- Hydrogen

Q. Assertion: Sodium reacts vigorously with cold water but magnesium does not react with cold water.
Reason: Sodium is more reactive than magnesium.

1. Assertion: True, Reason: False
   
   Reason is not the correct explanation of assertion.
2. Assertion: True, Reason: True
   
   Reason is the correct explanation of assertion.
3. Assertion: False, Reason: False
4. Assertion: False, Reason: True

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

Q.

Hydrogen chloride reacts with metals to form:

1. Metal chlorides and hydrogen

2. Metal chlorides and water

3. Metal chlorides and oxygen

4. Metal chlorides and nitrogen

Q. Sodium and potassium react violently with cold water.

1. True
2. False

Q.

Reactive metals react with _____ water to produce hydrogen.

Q.

Sodium reacts with cold water vigorously but iron only react with steam. It is because:

1. Iron is inert
2. Sodium only reacts with water

3. Sodium is highly reactive and iron needs more energy to react with water

4. Iron is highly reactive than that of sodium

Q.

$Zn\left(s\right)+2NaOH\left(aq\right)\to X+Y$. Identify the X and Y in the reaction.

1. X:- $N{a}_{2}ZnO$

   Y:- $H_{2}O$

2. X:- $NaZnO$

   Y:- $H_2$

3. X:- $N{a}_{2}Zn{O}_2$

   Y:- $H_{2}O$

4. X:- $NaZnO$

   Y:- $H_{2}O$

Q. Which of the following will turn blue litmus to red?

1. Magnesium oxide
2. Sulphur dioxide
3. Copper oxide
4. Sodium oxide

Q.

Potassium is an alkaline earth metal

1. True
2. False

Q. Write the word equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced in the reaction is ignited with a burning matchstick?

Q.

Phosphorous$\left(\mathrm{P}\right)$ is kept in

1. Kerosene oil

2. alcohol

3. water

4. ammonia

Q. ______ reacts with the oxygen to form oxides that turns blue litmus _____.

1. Sodium, green
2. Magnesium, red
3. Iron, black
4. Carbon, red

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

1. float
2. sink
3. disappear

Q. Question 8
Which of the following reacts with cold water vigorously?

(a) carbon
(b) sodium
(c) magnesium
(d) sulphur

Q. If a substance X reacts with air to form an oxide Y that turns moist blue litmus red, then X is .

1. carbon
2. magnesium
3. sodium

Q. ______ reacts with the oxygen to form oxides that turns blue litmus _____.

1. Sodium, green
2. Magnesium, red
3. Iron, black
4. Carbon, red

Q. Read the statements and select the option that correctly identifies them as true (T)/false (F).
1. Gold and silver do not react with water.
2. Metals produce oxygen when they react with acid as well as base.
3. Phosphorus readily reacts with oxygen to give phosphorus pentoxide, which turns moist blue litmus red.
4. Metal oxides are basic in nature.

Q. Write the word equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced in the reaction is ignited with a burning matchstick?

Q.

Oxides of non-metals are acidic

1. True

2. False

Q. If a substance X reacts with air to form an oxide Y that turns moist blue litmus red, then X is .

1. carbon
2. sodium
3. magnesium

Q. Which of the following will turn blue litmus to red?

1. Sodium oxide
2. Copper oxide
3. Sulphur dioxide
4. Magnesium oxide

Q. Which of the following will turn blue litmus to red?

1. Magnesium oxide
2. Sulphur dioxide
3. Copper oxide
4. Sodium oxide

Q. Choose the metals which releases hydogen gas with acids.

1. Sodium
2. Aluminium
3. Iron
4. Silver
5. Gold
6. Platinum
7. Magnesium
8. Zinc

Q. Generally , ___(i)___ oxides are ____(ii)____ in nature.

1. (i) - metallic, (ii) - acidic
2. (i) - non-metallic, (ii) - acidic
3. (i) - metallic, (ii) - neutral
4. (i) - non-metallic, (ii) - neutral

Q. Write the word equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced in the reaction is ignited with a burning matchstick?

Q. Assertion: Sodium reacts vigorously with cold water but magnesium does not react with cold water.
Reason: Sodium is more reactive than magnesium.

1. Assertion: False, Reason: False
2. Assertion: True, Reason: False
   
   Reason is not the correct explanation of assertion.
3. Assertion: False, Reason: True
4. Assertion: True, Reason: True
   
   Reason is the correct explanation of assertion.