Preparation of Hydrogen from Cold Water and Metals

Q. Which of the following characteristics of hydrogen does not resemble neither alkali metal nor halogen?

1. Reducing agent​
2. Valency​
3. Electronegative character​
4. Atomic number​

Q.

Which metal does not react with water or steam:-

1. Potassium

2. Zinc

3. Calcium

4. Copper

Q. Which of the following metal on reaction with cold water liberates hydrogen gas but does not float on water (unlike calcium) due to its vigorous reaction (with water)?

1. Sodium (Na)
2. Calcium (Ca)
3. Zinc (Zn)
4. Gold (Au)

Q. Which of the following metals float in their reactions with cold water?

1. Zinc (Zn)
2. Iron (Fe)
3. Calcium (Ca)
4. Gold (Au)

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

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

Q.

Hydrogen gas is not obtained when zinc reacts with:

1. Cold water

2. Hot $NaOH$ solution

3. $Conc.H_{2}S{O}_4$

4. Dil. $HCl$

Q.

State whether the following reaction is True or False.
$Ca+2H_{2}O\to Ca(OH{)}_2+H_2$

1. True

2. False

Q.

Which of the following metal on reaction with cold water liberates hydrogen gas but does not float on water?

1. Gold (Au)

2. Zinc (Zn)

3. Sodium (Na)

4. Calcium (Ca)

Q.

What is the observation that can be made when calcium reacts with $H_{2}O$?

1. Calcium floats on water

2. Calcium does not react at all

3. Explosive reaction

4. Vigorous reaction

Q.

The metal Calcium upon reaction with water, forms bubbles of hydrogen gas. These gas bubbles stick to the surface of the metal making the metal to ___ on the water. Identify the correct option to fill in the blank.

1. Produce flames

2. Melt

3. Vigorously react

4. Float