Reactions of Acids

Q. Question 1
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
$\begin{array}{cccc}Metal& Zinc& Magnesium& Copper\\ Zincoxide& -& -& -\\ Magnesiumoxide& -& -& -\\ Copperoxide& -& -& -\end{array}$
In which cases will you find displacement reactions taking place?

Q.

Use the following information to answer the next question.

Potassium hydroxide reacts with sulphuric acid to produce potassium sulphate and water.

Which equation represents the correct word equation for the given reaction?

1. Potassium hydroxide − Sulphuric acid ← Potassium sulphate − Water

2. Potassium hydroxide + Sulphuric acid ← Potassium sulphate + Water

3. Potassium hydroxide − Sulphuric acid → Potassium sulphate − Water

4. Potassium hydroxide + Sulphuric acid → Potassium sulphate + Water

Q.

Neutralisation reaction between acids and bases are ________________________ reactions.

Q. Question 3
10 mL of a solution of NaOH is found to be completely neutralized by 8 mL of a given solution of HCl. If we take 20 mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralize it will be:
1. 4 mL
2. 8 mL
3. 12 mL
4. 16 mL

Q. Which of the following metals can displace calcium in a reaction?

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

Q.

Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water.

1. True
2. False

Q.

Question 01.
What happens when a solution of an acid is mixed with a solution of a base in a test tube ?
(i) The temperature of the solution increases.
(ii) The temperature of the solution decreases.
(iii) The temperature of the solution remains the same.
(iv) Salt formation takes place.

1. (i) only
2. (i) and (iii)
3. (ii) and (iii)
4. (i) and (iv)

Q.

On heating, Ammonia $\left({\mathrm{NH}}_3\right)$ gives Nitrogen $\left({\mathrm{N}}_2\right)$ and Hydrogen $\left({\mathrm{H}}_2\right)$.Hydrogen on treatment with Chlorine $\left({\mathrm{Cl}}_2\right)$gas forms Hydrogen chloride gas $\left(\mathrm{HCl}\right)$.Hydrogen chloride on dissociation in water $\left({\mathrm{H}}_2\mathrm{O}\right)$ forms Hydrochloric acid. Hydrochloric acid on treatment with Sodium hydroxide $\left(\mathrm{NaOH}\right)$ forms Sodium chloride $\left(\mathrm{NaCl}\right)$ and water. Sodium chloride thus formed on treatment with Silver nitrate $\left({\mathrm{AgNO}}_3\right)$ forms Silver chloride $\left(\mathrm{AgCl}\right)$ and Sodium nitrate $\left({\mathrm{NaNO}}_3\right)$.

various types of reaction involved in the above process are given below:

(A) Combination reaction

(B) Neutralization reaction

(C) Precipitation reaction

(D) Decomposition reaction

Arrange them in a proper sequence as given above.

1. ADCB

2. ADBC

3. DACB

4. DABC

Q. Which of these does not contain free ions?

1. KOH solution
2. HCl solution
3. Vinegar
4. HCl gas

Q. NaOH+H2SO4 -->

Q. Which of the following is a neutralisation reaction?

1. $\mathrm{NaOH}\left(\mathrm{aq}\right)+\mathrm{HCl}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{aq}\right)+H_{2}O\left(l\right)$
2. $2\mathrm{HCl}\left(\mathrm{aq}\right)+2\mathrm{Na}\left(s\right)\to 2\mathrm{NaCl}\left(\mathrm{aq}\right)+H_2\left(g\right)$
3. ${\mathrm{Na}}_2{\mathrm{CO}}_3\left(\mathrm{aq}\right)+H_{2}O\left(l\right)\to 2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{CO}}_2\left(g\right)$
4. ${\mathrm{NH}}_3\left(\mathrm{aq}\right)+H_{2}O\left(l\right)\to {\mathrm{NH}}_4\mathrm{OH}\left(\mathrm{aq}\right)$

Q.

$H^{+}$ ions react with water to give _______.

1. Hydroxyl radical

2. Salt

3. Alkali

4. Hydronium Ion

Q.

When NaCl is dissolved in water, it forms $N{a}^{+}$ and $C{l}^{-}$ ions. The $N{a}^{+}$ ions will be attracted by which part of water?

1. Entire water molecule

2. Hydrogen atom

3. They will not be attracted by water molecules

4. Oxygen atom

Q. Why metals dont react with metals?
if they do so , do they form compounds ? If not why?

Q.

Acids and alkalies can react with each other to neutralise their individual properties.

1. False

2. True

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

1. Hydrogen
2. Oxygen
3. Nitrogen

Q.

Complete the following reaction: $N{a}_{2}C{O}_3\left(s\right)+dil.HCl\left(aq\right)\to$ ___?

1. $N{a}_{2}S{O}_4+H_{2}O$
   
2. $N{a}_{2}S{O}_4+C{O}_2$
   
3. $N{a}_{2}S{O}_4+H_{2}O+C{O}_2$
4. $N{a}_{2}C{O}_3+H_{2}O+C{O}_2$
   

Q. Which among the following effects is not caused due to carbonated drinks?

1. It will make the teeth prone to decay due to sugar in it
2. It will make teeth black
3. All of these
4. It will erode the outer covering of teeth

Q. Which of these reactions releases hydrogen gas?

1. $Na+HCl\to$
2. $N{a}_{2}C{O}_3+HCl\to$
3. $NaHC{O}_3+HCl\to$
4. $NaOH+HCl\to$

Q. Calcium carbonate reacts with hydrochloric acid to form calcium chloride and hydrogen gas.

1. False
2. True

Q. Which of these reactions release a gas which burns with a pop sound?

1. $CaC{O}_3+H_{2}S{O}_4\to$
2. $Cu+HCl\to$
3. $K+HCl\to$
4. $NaOH+H_{2}S{O}_4\to$

Q. Acids react with metal carbonates to produce carbon dioxide gas.

1. False
2. True

Q. What are the products formed when aluminium reacts with hydrogen gas ? Give equation.

Q. Complete the following reactions:
(a) $Metal+dil.Acid\to Salt+$
(b) $Metalhydrogencarbonate+dil.Acid\to Salt+$$+Water$

1. Oxygen
2. Nitrogen
3. Carbon dioxide
4. Hydrogen

Q.

Dilute hydrochloric acid $\text{(HCl)}$ reacts with metals to evolve _____ gas along with the formation of corresponding metal salt.

1. oxygen
2. chlorine
3. nitrogen
4. hydrogen