Acid Bases

Which of the following values would represent the pH of a strong base?

• 1

• 8

• 7

• 13

Will the colour of the red litmus paper will change to blue if it is dipped into a basic solution?

• Yes

• No

Tags

NGSS.MS-PS1-2

Consider the following statements : (a)Both acids and bases change colour of all indicators. (b) If an indicator gives a colour change with an acid, it does not give a change with a base. (c) If an indicator changes colour with a base, it does not change colour with an acid. (d) Change of colour in an acid and a base depends on the type of the indicator. Which of these statements are correct?

• All four

• a and d

• b , c and d

• Only d

Three liquids are given to you. One is hydrochloric acid, another is sodium hydroxide and third is a sugar solution. How will you identify them? You have only turmeric indicator.

• Name of the substances Effect on turmeric indicator

  Hydrochloric acid Yellow to blue

  Sodium hydroxide Yellow to red

  Sugar solution No change

• Name of the substances Effect on turmeric indicator

  Hydrochloric acid Yellow to red

  Sodium hydroxide Yellow to blue

  Sugar solution No change

If a substance tastes sour it is known as

• Basic

• Acidic

• Neutral

• None of these

Curd contains (a)________, whereas lime water has (b)__________.

• a= Citric acid ; b= Sodium hydroxide

• a= Lactic acid ; b= Calcium hydroxide

• a= Calcium hydroxide ; b= Lactic acid

• None of these

Nitric acid turn red litmus blue

• True

• False

Sodium Hydroxide turns blue litmus red

• True

• False

Name the reaction :

The reaction between an acid and base produces salt and water with evolution of heat.

Name the Base used in making for making Slaked lime