Bases

Q. Copper oxide is a/an while potassium hydroxide is a/an .

1. base
2. alkali
3. acid
4. salt

Q.

Statement 1: Sodium hydroxide can be used to treat acidity. ​

Statement 2: Mild bases can be used as antacids.

1. Statement 2 is true, but statement 1 is false.
2. Statement 1 is true, but statement 2 is false.
3. Both statements are false.
4. Both the statements are true.

Q. What are the possible values of pH?

Q.

What is the color of Potassium dichromate?

1. Orange
2. Red
3. Blue
4. Colourless

Q.

Silvery grey iron fillings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glow red. On cooling it forms a grey dull solid. Which statement is correct about the contents of the test tube in the experiment?

1. At the end a compound is formed

2. At start, they cannot be separated with a magnet

3. At the end, they can be separated with a magnet

4. At start, there is a compound

Q. Choose the correct option:
$\left(d\right)$ Elements which show unique nature in the preparation of hydrogen are

Q. Which of the following are not the properties of bases?

1. Bases are sweet in taste.
2. Bases change blue litmus to red.
3. Bases change red litmus to blue.
4. Bases are soapy in touch.

Q.

If the pH value of a substance is below seven then it is ______ in nature.

1. basic

2. acidic

3. alkaline

4. neutral

Q. The pH of bases lies between 7 and 14.

1. \N
2. \N

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Why do HCl, $HN{O}_3$, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Q.

The pH of a solution is found to be 5.5. What is the nature of the solution?

1. Acidic

2. Basic

3. Neutral

4. Difficult to determine

Q. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Why do HCl, $HN{O}_3$, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Q. (A) is $N{H}_{4}N{O}_2$.

1. True
2. False

Q. The pH of bases lies between 7 and 14.

1. \N
2. \N

Q. To form a basic solution which of the following salts will hydrolyze in water?
I. $NaCl$
II. $CuS{O}_4$
III. $K_{3}P{O}_4$

1. I only
2. III only
3. I and II only
4. II and III only
5. I, II and III

Q.

Silvery grey iron fillings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glow red. On cooling it forms a grey dull solid. Which statement is correct about the contents of the test tube in the experiment?

1. At the end a compound is formed

2. At start, they cannot be separated with a magnet

3. At the end, they can be separated with a magnet

4. At start, there is a compound

Q. What are the possible values of pH?

Q.

Pick the odd one out.

1. Vinegar

2. Ant bite

3. Orange juice

4. Calamine