Properties of Bases

Q.

What is Ionisation theory ?

Q. Is it possible to determine a material is edible or not by using pH? How?

Q. Which of the following substance is bitter in taste?

1. Baking soda
2. Lemon
3. Tamarind
4. Orange

Q. Which of the following substances are soapy in touch?

1. Sodium bicarbonate
2. Malic acid
3. Citric acid
4. Tartaric acid

Q. Methyl orange exhibits yellow colour in basic medium.

1. True
2. False

Q.

Give reason for the following:

Limewater turns milky when carbon dioxide gas is passed through it.

Q. Match the following:
$$\begin{array}{cc}a)Litmus& 1)Blueinacidic,pinkinbasicsoil\\ b)Methylorange& 2)Redinacidic,yellowinbasicsolutions\\ c)Phenolphthalein& 3)Blueinbasic,redinacidicsolutions\\ d)ColorofHydrangea& 4)Pinkinbasic,colorlessinacidicsolutions\end{array}$$

1. A-2, B-3, C-4, D-1
2. A-3, B-1, C-2, D-4
3. A-3, B-2, C-4, D-1
4. A-3, B-4, C-2, D-1

Q.

(a) What is an acid-base indicator? Name the three common indicators used in chemistry laboratory.

(b) Name an acid-base indicator extracted from lichen.

(c) What colour does the methyl orange turn to when put in an acidic solution ?

Q.

What pH values can a universal indicator detect?

1. 0-7

2. 4-10

3. 7-14

4. 0-14

Q.

Which of the following categories does blood belong to?

1. Weak acid

2. Weak base

3. Strong base

4. Strong acid

Q. Lime water turnswhen CO2 is passed through it.

1. milky
2. red
3. blue

Q.

Which of the following types of medicine is used for the treatment of indigestion?

1. Antibasic

2. Analgesic

3. Antacid

4. Antiseptic

Q. $N{H}_3$ cannot release $O{H}^{-}$ ions. Can it be a base?

1. No, $N{H}_3$ has hydrogens and hence is an acid.
2. No, a base should ionize in water to form $O{H}^{-}$ ions.
3. Yes, $N{H}_3$ can release OH- ions and hence is a base.
4. Yes, $N{H}_3$ can accept a proton.

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. Arrange the following substances in the increasing order of the basicity from the top.

1. Human blood
2. Milk
3. Ammonia
4. Seawater

Q. State whether the pH of water is >7 or<7 or=7 a: a)80^° C b)-80^° C State why?

Q.

Analyze the reaction given below and identify the salt formed.
$\text{FeO (aq) + HCl (aq)}\to {\text{Salt + H}}_2\text{O (l)}$

1. $\text{FeO}$
2. ${\text{FeCl}}_2$
3. ${\text{Fe}}_2{\text{O}}_3$
4. ${\text{FeSO}}_4$

Q.

Liquor ammonia is formed as ammonia is ___________ in water.

1. Not soluble

2. Sparsely soluble

3. Less soluble

4. Highly soluble

Q. Match the following:
$$\begin{array}{cc}a)Litmus& 1)Blueinacidic,pinkinbasicsoils\\ b)Methylorange& 2)Redinacidic,yellowinbasicsolutions\\ c)Phenolphthalein& 3)Blueinbasic,redinacidicsolutions\\ d)ColorofHydrangea& 4)Pinkinbasic,colorlessinacidicsolutions\end{array}$$

1. A-3, B-4, C-2, D-1
2. A-2, B-3, C-4, D-1
3. A-3, B-1, C-2, D-4
4. A-3, B-2, C-4, D-1