Introduction to Acid, Base and Salts

Q.

What is observed when dilute sulphuric acid is added to solid sodium carbonate?

Q.

Write an equation to represent the reaction between ethanoic acid and ethanol in the presence of conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$. What is the general name of this reaction.

Q.

(i)_______ turn blue litmus red whereas (ii)______ turn red litmus blue.

Q.

Sodium hydrogen carbonate, when added to acetic acid, evolves gas. Which of the following statements are true about the gas evolved? $\left(\mathrm{i}\right)$ It turns lime water milky $\left(\mathrm{ii}\right)$ It extinguishes a burning splinter $\left(\mathrm{iii}\right)$ It dissolves in a solution of sodium hydroxide $\left(\mathrm{iv}\right)$ It has a pungent odor.

1. $\left(\mathrm{i}\right)$ and $\left(\mathrm{ii}\right)$

2. $\left(\mathrm{i}\right),\left(\mathrm{ii}\right)$ and $\left(\mathrm{iii}\right)$

3. $\left(\mathrm{ii}\right),\left(\mathrm{iii}\right)$ and $\left(\mathrm{iv}\right)$

4. $\left(\mathrm{i}\right)$ and $\left(\mathrm{iv}\right)$

Q.

Which among the given acids is a monobasic acid?

1. Sulphuric acid

2. Hydrochloric acid

3. Carbonic acid

4. Phosphoric acid

Q.

The common names of $CaO$ and $Ca(OH{)}_2$ respectively are

1. Slaked lime and quick lime

2. Quick lime and slaked lime

3. Calcium oxide and Calcium hydroxide

4. Calcium hydroxide and Calcium oxide

Q.

The compound containing co-ordinate bond is

1. O₃

2. SO₃

3. H₂SO₄

4. All of these

Q.

The solution of ash of magnesium ribbon is acidic , basic or neutral?

Q.

Lead cannot be used in preparation of hydrogen using dilute acids. Why?

Q.

What happens when washing soda is heated up?

Q.

What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write the chemical equation for the reaction involved.

Q.

How would you obtain ethene from ethanol? Give equation.

Q.

Which of the following salt is not used as a fertilizer?

1. $MgS{O}_4$

2. $(N{H}_4{)}_{2}S{O}_4$

3. $KCl$

4. $NaN{O}_3$

Q.

Which of the following method(s) is/are used in preparing a base?

1. Burning of metal in air

2. Adding water to a metal oxide.

3. Heating metal carbonates

4. Reaction between an acid and base

Q. Question 4
Explain the nature of the covalent bond using the bond formation in ${\text{CH}}_3\text{Cl}$.

Q.

Complete the following.

${\mathrm{CaCl}}_2+2{\mathrm{C}}_{17}{\mathrm{H}}_{35}{\mathrm{COO}}^{-}{\mathrm{Na}}^{+}\to$

Q.

When a mixture of ethanol, ethanoic acid and a few drops of concentrated sulphuric acid is heated in a water bath a compound with fruity smell is formed. Write the general name of this reaction.

Q.

You are provided with magnesium ribbon and sulphur powder. Explain with the help of activity that metal oxides are basic and oxides of non-metals are acidic.

Q.

Which gas is given off when dilute hydrochloric acid is added to calcium carbonate?

Q. Assertion (A): $Al(OH{)}_3$ is amphoteric in nature.
Reason (R): $Al(OH{)}_3$ is $H^{+}$ donor acid as well as $O{H}^{-}$ donor base.

1. (A) is correct; (R) is correct and (R) correctly explains (A).
2. (A) is correct; (R) is correct and (R) doesn't explain (A) correctly.
3. (A) is correct; (R) is incorrect.
4. (A) is incorrect; (R) is correct.

Q.

Which of the following reaction produces a base?

1. Reaction between metal and oxygen

2. Reaction between a metal oxide and water

3. Reaction between an acid and a base

4. Heating of metal carbonates

Q.

When an organic compound X is warmed with alkaline solution of ${\mathrm{KMnO}}_4$ a new compound Y is formed which has vinegar like smell. On heating compounds X and Y with few drops of concentrated sulphuric acid another compound Z with fruity smell is formed. Name the

(i) Compound X and Y

(ii) process of conversion of X and Y

(iii) compound Z

(iv) process of formation of Z

Q. is the chemical formula of bleaching powder.

1. ${\text{CaCO}}_3$
2. ${\text{Ca(OH)}}_2$
3. ${\text{Ca(NO}}_3{)}_2$
4. ${\text{CaOCl}}_2$
5. $\text{CaO}$
6. ${\text{CaCl}}_2$

Q.

Name the salt which is mixed with carbon dioxide and calcium carbonate in the manufacturing of glass.

1. Calcium sulphate

2. Sodium bicarbonate

3. Sodium carbonate

4. Copper sulphate

Q.

Identify the anion present in the following compounds:

A salt D on treatment with Dilute Sulphuric acid produces a gas which turns lime water milky but no effect on acidified potassium chromate solution.

Q.

Which among the given acids is a monobasic acid?

1. Sulphuric acid

2. Hydrochloric acid

3. Carbonic acid

4. Phosphoric acid

Q.

Coordinate bond is depicted by an arrow, where the tail points towards the atom which is deficient in electron and the arrowhead points towards the atom which has donated the electron.

1. True

2. False

Q.

$MgO+HCl\to$__________.

1. $MgC{l}_2+H_{2}O$

2. $Mg(OH{)}_2+H_{2}O+C{l}_2$

3. $Mg+H_{2}O+C{l}_2$

4. No reaction

Q. Question 4 (b)
Write the chemical formulae of the following:
(b) Calcium oxide

Q. In general van der waal radius and covalent radius of an atom which one is high