Reaction of Acids and Bases with Metals

Q.

Amongst the following the strongest base in aqueous medium is:

1. ${\left({\mathrm{CH}}_3\right)}_2\mathrm{NH}$

2. ${\mathrm{CH}}_3{\mathrm{NH}}_2$

3. ${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NHCH}}_3$

4. ${\mathrm{NCCH}}_2{\mathrm{NH}}_2$

Q.

Which of the following metals on reacting with Sodium Hydroxide solution produce Hydrogen Gas?

1. Iron$\left(\mathrm{Fe}\right)$

2. Zinc$\left(\mathrm{Zn}\right)$

3. Aluminum$\left(\mathrm{Al}\right)$

4. Both B and C

Q.

What happens when zinc granules are treated with a dilute solution of ${\mathrm{H}}_2{\mathrm{SO}}_4,\mathrm{HCl},{\mathrm{HNO}}_3,\mathrm{NaCl}\mathrm{and}\mathrm{NaOH}$, also write the chemical equations if a reaction occurs.

Q.

Why should curd and sour substance not be kept in brass and copper vessel?

Q.

Which metals do not react with dilute hydrochloric acid?

Q. On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
(a) Predict the new compound formed which imparts a blue-green colour to solution.

Q. Is their any trick for learning reactivity series of metal

Q.

When zinc reacts with dilute hydrochloric acid, zinc chloride is formed along with the evolution of gas X. The evolved gas is colourless, odourless and neutral to litmus. So, gas X is:

1. H₂

2. O₂

3. CO₂

4. Cl₂

Q.

Any shortcut or easy way to learn reactivity series

Q.

Why is aluminium containers used to transport nitric acid?

Q.

Hydrogen gas is not evolved when metals react with nitric acid. Give a reason

Q.

When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilized in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

Q.

Classify acids on the basis of their basicity and explain each of them with examples.

Q.

Why are amines basic in nature?

Q. Assertion [A]: Sodium chloride is a neutral salt.
Reason [R]: Sodium chloride is prepared from a weak acid and a strong base.

1. (A) and (R) both are correct and (R) is correct explanation of (A) .
2. (A) and (R) both are correct but (R) is not the correct explanation of (A).
3. (A) is correct but (R) is not correct.
4. (A) is not correct but (R) is correct.

Q.

Write a balanced chemical equation for the preparation of the following salt:
Ammonium sulphates crystals

Q.

State your observation when dilute hydrochloric acid is added to copper carbonate?

Q.

Aluminium is more reactive than zinc.

1. True
2. False

Q.

How do bases react with the following? Write the equations

1. Non-metallic oxide
2. Ammonium salt
3. Soluble metallic salt
   

Q.

(b) Write a balanced equation for the preparation of each of the following salts:

(2) Zinc carbonate from Zinc sulfate.

Q.

The correct procedure to show that zinc is more reactive than copper is:

1. Prepare copper sulphate solution and dip zinc strip in it.

2. Add dilute nitric acid on both the strips.

3. Mix solid zinc sulphate and copper.

4. Heat zinc and copper strips.

Q.

In the reactivity series, do metals below hydrogen also react with acids to form salts and evolve hydrogen

Q.

Iron can react with copper sulphate solution to form iron sulphate and copper, but copper cannot react with iron sulphate to form copper sulphate and iron. Explain.

Q.

What happens when dilute $\mathrm{HCl}$ is added to ${\mathrm{Na}}_2{\mathrm{CO}}_3$ placed in a test tube?

1. An explosion takes place.

2. Brisk effervescence takes place.

3. Gas with a pungent smell is evolved.

4. No chemical reaction takes place.

Q.

Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solutions as shown below. You would observe the deposition of metal on zinc in beakers:

1. II and IV

2. Only II

3. I and III

4. Only I

Q.

Copper nitrate is heated to form copper oxide, gas X and gas Y. Gas X is colourless and neutral to litmus. Gas Y is brown in colour having an irritating odour and non-combustible. Gas Y turns green acidified ferrous solution brown. Gas Y is:

1. H₂S

2. NO₂

3. N₂O

4. O₂

Q.

Metals differ in their reactivity with acids. Justify the statement giving examples. [3 MARKS]

Q.

State reason for the following:

Curd should not be kept in copper or brass vessels. What is done to protect it?

Q. What is the difference between hydronium and hydroxyl?

Q.

Metal oxides react with dilute acids and form salt and water.

1. True

2. False