Manufacture of Acids and Bases

Q.

Which of the following is a strong base?

1. Potassium hydroxide

2. Calcium hydroxide

3. Magnesium hydroxide

4. Ammonium hydroxide

Q.

__________ is the chemical formula of soda ash.

Q.

A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P.

(a) What is substance P ? Write its common name as well as chemical formula.

(b) What is substance Q ?

(c) What is gas R ?

(d) What is substance S ? What is its clear solution known as ?

(e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.

Q. $\text{MgO}$ reacts with water to form

1. ${\text{MgH}}_2$
2. ${\text{MgCO}}_3$
3. ${\text{Mg(OH)}}_2$

Q.

Non-metals react with oxygen to form _____ or ______.

Q. Question 37
Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why?

Q.

If ammonia gas is mixed with water then will it react with water to form ammoniun hydroxide?

Q. Which type of reaction is this ?
CuCO3 + H2SO4 -----------> CuSO4 + H2O

Q. is the common name of calcium hydroxide.

1. Quick lime
2. Slaked lime
3. Caustic soda

Q.

A student working in a laboratory added some water to a syrupy liquid taken in a test tube. The test tube immediately cracked and the liquid escaped out. This liquid on reaction with the student's skin caused blisters. What can be the possible reason for this reaction?

Q. The acidic anhydride of sulphuric acid is

1. $C{O}_2$
2. $S{O}_2$
3. $S{O}_3$
4. $H_{2}O$

Q. Question 56
A metal M does not liberate hydrogen from acids but reacts with oxygen to give a black colour product. Identify M and black coloured product and also explain the reaction of M with oxygen

Q.

Acidic oxides that are dissolved in the water turn red litmus blue.

1. True
2. False

Q. What is Taj Mahal made up of?

1. Calcium carbonate
2. Magnesium carbonate
3. Silica
4. Plaster of Paris

Q. Which of the following oxides is basic in nature?

1. ${\text{SO}}_2$
2. ${\text{CO}}_2$
3. ${\text{K}}_{2}O$
4. ${\text{Cl}}_{2}O$

Q.

Which of the following reaction produces a base?

1. Burning of metal in air

2. Adding water to a metal oxide.

3. Reaction between an acid and base

4. Heating metal carbonates

Q. In an accident at a factory, some nitric acid was spilt. Which substance, when added would neutralise the acid without leaving an alkaline solution?

1. Calcium carbonate
2. Water
3. Calcium sulphate
4. Sodium chloride

Q.

Sodium oxide is an example of:

Q. Question 44

You are provided with two containers made up of copper and aluminium. You are also provided with solutions of dilute $\text{HCl}$, dilute ${\text{HNO}}_3,{\text{ZnCl}}_2\text{(aq)}$ and ${\text{H}}_2\text{O}$. In which of the above containers these solutions can be kept?

Q.

What are five types of salts? Explain with examples. [5 MARKS]

Q. Choosing the correct words given in brackets, complete the sentences given below:
(i) An acid is a compound which, when dissolved in water gives ________ (hydronium/hydroxide) ions as the only _________ (positive/negative) ions.
(ii) A(n) _________ (acid/basic) salt is one in which the hydrogen of an acid has been partially replaced by a _________ (metal, non-metal).

Q. For dilution of concentrated acid, we should add

1. first water into acid and then more acid.
2. Both (a) and (b) are correct.
3. water into concentrated acid.
4. concentrated acid into water.

Q.

Which of the following method is used in the preparation of a base?

1. Burning of metal in air

2. Adding water to a metal oxide.

3. Reaction between an acid and base

4. Heating metal carbonates

Q.

1. What is the definition of acidic salts?
2. Write an equation for preparation of aqueous salt.
3. What will happen when bases react with metals? [3 MARKS]

Q.

Question 54
An alkali metal A gives a compound B (molecular mass = 40) on reacting with water. The compound B gives a soluble compound C on treatment with aluminium oxide. Identify A, B and C and give the reaction involved.

Q. The reaction of metallic oxides with an acid is an example of a neutralisation reaction.

1. True
2. False

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

1. True
2. False

Q.

Identify 'X' in the following reaction.

FeCl₃ + 3NaOH → X + 3NaCl

1. Fe₂O₃

2. H₂

3. NaH

4. Fe(OH)₃

Q. A metal on reaction with a dilute acid liberates ______ gas which burns with a pop sound.

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

Q. Choose the correct option:
Statement: For the preparation of acids by the double displacement reaction method, the salt of that desired acid reacts with another acid.
Reason: For the same reactants, a change in temperature can change the products.

1. Both statement and reason are true and the reason is the correct explanation.
2. Both statement and reason are true but the reason is not the correct explanation.
3. Statement is true but the reason is false.
4. Statement is false but the reason is true.