Manufacture of Acids and Bases

Q. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?

Q. Dilution of an acid or a base is an endothermic reaction.

1. True
2. False

Q. Question 29
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.

Q.

Which of the following phenomena occur, when a small amount of acid is added to water? (i) Ionisation (ii) Neutralisation (iii) Dilution (iv) Salt formation.

1. (i) and (ii)

2. (i) and (iii)

3. (ii) and (iii)

4. (ii) and (iv)

Q. Identify X in the following reaction
X+ Acid - Salt + Water.

1. Metal Oxide
2. Metal hydroxide
3. Both a and b
4. None of these

Q. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?

Q. For dilution of concentrated acid, we should add:

1. first water into acid and then more acid.
2. water into concentrated acid.
3. concentrated acid into water.
4. first water into acid and then more water.

Q. Dilution of an acid or a base is an endothermic reaction.

1. False
2. True

Q. For dilution of concentrated acid, we should add:

1. water into concentrated acid.
2. concentrated acid into water.
3. first water into acid and then more water.
4. first water into acid and then more acid.

Q. $A+B\to MgC{l}_2\left(aq\right)+2H_{2}O\left(l\right)$

1. $Mg(OH{)}_2$(s) + $2H_{2}S{O}_4\left(aq\right)$
2. $Mg\left(OH{)}_2\right(s)$ + $2HCl\left(aq\right)$
3. $MgOH\left(s\right)$ + $2HCl\left(aq\right)$
4. None of the above

Q. Identify X and Y in the reaction given below.

$\text{Zn(s) + 2HCl(aq)}\to \text{X + Y}$

Q. Statement 1: Metal oxides are also called basic oxides.
Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

1. Statement 1 is incorrect, but statement 2 is correct
2. Statement 1 is correct, but statement 2 is incorrect
3. Both statements are correct and statement 2 is the correct explanation for statement 1
4. Statement 1 and statement 2 are correct, but statement 2 is not the correct explanation for statement 1