Alkali and Bases

Q. How to know the basicity of a given acid

Q.

If bases are bitter in taste are plants like bitter gourd and neem also bases?

Q.

A substance 'X' is bitter in taste. The chemical nature of the substance could be:

1. Acidic

2. Basic

3. Neutral

4. Can't be determined

Q.

Definition of acids and bases?

Q.

Is$\mathrm{Mg}{\left(\mathrm{OH}\right)}_2$ Alkali?

Q.

Is NaH a good base?

Q.

Sodium hydroxide is a/an__________.

1. Acid

2. Salt

3. Base

4. Neutral Solution

Q.

The main property of an alkali which differentiates it from a base is

1. Alkalis do not react with acids.

2. Alkalis are bases soluble in water.

3. Alkalis do not have a bitter taste.

4. Alkalis are not soapy in nature.

Q. How could i know that any element is a strong or weak acid/base/salts if given in examinations.

Q.

Name:

The term given to water soluble bases.

Q. Among the given substances, identify the one which is basic in nature.

1. Lemonade
2. Tomato
3. Toothpaste
4. Vinegar

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

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

Q.

To prevent tooth decay, one is advised to brush the teeth regularly. The ingredient of the paste which checks tooth decay is:

1. acidic
2. basic
3. neutral
4. corrosive

Q.

You are given two test tubes A and B, containing two different solution, one of them is an acidic solution and the other one is a basic solution. The solution in test tube B tastes sour while that in taste tube A is bitter in taste. You are asked to label the test tubes as acidic and basic. [2 MARKS]

Q. Match the following:
$$\begin{array}{cc}\text{a) Litmus}& \text{1) Blue in acidic, pink in basic soils}\\ \text{b) Methyl orange}& \text{2) Red in acidic, yellow in basic solutions}\\ \text{c) Phenolphthalein}& \text{3) Blue in basic, red in acidic solutions}\\ \text{d) Color of Hydrangea}& \text{4) Pink in basic, colorless in acidic solutions}\end{array}$$

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.

Solution A is a strong acid, Solution B is a weak acid, Solution C is a strong alkali

4. Give an example of a solution that is a weak alkali.

Q.

All bases are alkali.

Say True or False.

1. False

2. True

Q. Which of the given substances is not basic in nature?

1. Soap
2. Lemon
3. Baking soda
4. Toothpaste

Q. What are bases?

Q. In general hydroxides of alkali metals and alkaline earth metals are considered as :

1. acids
2. alkalis
3. soluble metals
4. none of above

Q. What are acids?

Q.

When a compound X is dissolved in water, it dissociates as shown below:

$X\to A$ + $O{H}^{-}$

Here X is:

1. Arrhenius acid

2. Arrhenius base

3. Neutral

4. Cannot be determined

Q. limewater is acidic in nature or basic in nature?

Q.

Dileep: Acids give a bitter taste and soapy touch

Pooja: Bases give a bitter taste and soapy touch

Who is correct?

Q.

A substance 'X' is bitter in taste. The chemical nature of the substance could be:

1. Acidic

2. Basic

3. Neutral

4. Can't be determined

Q. Which of the following pair of substances contains only base?

1. Vinegar and lemon
2. Limewater and curd
3. Soap and toothpaste
4. Apple and tamarind

Q. ............ soluble bases are called alkalis.

1. Water
2. Acid
3. Ether
4. None of the above

Q. All alkalis are ............ but all ........... are not alkalis.

1. acids
2. bases
3. bases, acids
4. acids, bases

Q. Which among the following is a basic substance?

1. Orange juice
2. Vinegar
3. Tomato juice
4. Detergent

Q. Among the oxides, $M{n}_2{O}_7\left(I\right),V_2{O}_3\left(II\right),V_2{O}_S\left(III\right),CrO\left(IV\right)$ and $C{r}_2{O}_3\left(V\right)$ the basic oxides are :

1. $I$ and $II$
2. $II$ and $IV$
3. $II$ and $III$
4. $III$ and $IV$