Reaction of Acids with Metals

Q. gas is produced when iron reacts with sulphuric acid.

1. Hydrogen
2. Oxygen
3. Nitrogen

Q.

Question 1:

What are natural acids?

Q.

Name the following:
A gas liberated when nitric acid reacts with lead carbonate.

Q. Which of the following vessels cannot be used to store curd?

1. Plastic bowl
2. Copper bowl
3. Wooden bowl
4. Plastic bag

Q. Can you store lemon pickle in an aluminium utensil? Explain. ​

Q.

Question 1:

What are natural acids?

Q. Which of the following metal will give metal hydroxide as a product with cold water ?

1. Zn
2. Fe
3. Al
4. Na

Q. Write the balanced equation for the following reaction :

1. ${2KHCO}_3+H_2{SO}_4\to K_2{SO}_4+{2H}_{2}O+{2CO}_2$
2. ${4KHCO}_3+H_2{SO}_4\to 2K_2{SO}_4+{2H}_{2}O+{2CO}_2$
3. ${2KHCO}_3+3H_2{SO}_4\to 3K_2{SO}_4+{2H}_{2}O+{2CO}_2$
4. ${2KHCO}_3+2H_2{SO}_4\to K_2{SO}_4+{4H}_{2}O+{2CO}_2$

Q.

Acids dissolve most metals, which special mixture of acids is used to dissolve gold?

1. Aqua Fortis

2. Aqua Fresca

3. Aqua Vitriola

4. Aqua Regia

Q. A salt can be between produced by reaction.
A. A weak acid and weak base.
B. Metal oxide and water.
C. Metal and a mineral acid.
D. Metal oxide and a mineral acid.

1. A, B and C
2. B, C and D
3. C, D and A
4. D, A and B

Q.

Acids dissolve most metals, which special mixture of acids is used to dissolve gold?

1. Aqua Vitriola

2. Aqua Regia

3. Aqua Fresca

4. Aqua Fortis

Q. A metal compound $X$, which is insoluble in water, reacts with dil. $H_2{SO}_4$ to produce effervescence. The gas evolved extinguishes a burning candle. If one of the compounds formed is calcium sulphate, then what are $X$ and the gas evolved? Also, write a balanced chemical equation for the reaction which occurred.

Q.

Acids dissolve most metals, which special mixture of acids is used to dissolve gold?

1. Aqua Regia

2. Aqua Vitriola

3. Aqua Fortis

4. Aqua Fresca

Q. From given metals select the metal which has a hydroxide that reacts with both acids and alkalis.

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

Q. What is the nature of the following reaction?

1. Reacts vigorously
2. No reaction
3. Reacts modestly
4. Reacts slowly

Q. Reactive metals react with dilute $HCl$ to liberate:

1. water
2. hydrogen
3. carbon dioxide
4. oxygen

Q. Some word/ words are missing in the following statements. You are required to rewrite the statements in the correct form using the appropriate word/ words:
Aqua regia contains---- part by volume of nitric acid and ---- parts by volume of hydrochloric acid.