Acid and bases

If a substance tastes sour it is known as

• Basic

• Acidic

• Neutral

• None of these

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

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

Tags

NGSS.HS-PS1-1

Some examples of Tartaric acid are :-

• Tamarind

• Mango

• Unripe Mango

• Grapes

• Orange

The effect of the following test solution on turmeric :-

a) Vinegar

b)Sugar

c) soap

• a) Yellow

  b) Red

  c) Red

• a) Yellow

  b) Red

  c) Yellow

• a) Yellow

  b) Yellow

  c) Red

• None of these

Tags

NGSS.MS-PS1-2

Name any one natural indicator

Nitric acid turn red litmus blue

• True

• False

Sodium Hydroxide turns blue litmus red

• True

• False

Tags

NGSS.MS-PS1-2

Tooth decay is caused due to presence of

• Base

• Acid

• Fungi

• Neutral

• None of these

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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