Acid, base and salt

Base substances are generally taste ...

• sour

• sweet

• slippery

• bitter

Following are the natural indicators, except ...

• litmus paper

• china rose

• methyl orange

• turmeric

Acid substances will turn into ... color when using the red litmus paper.

• red

• blue

• yellow

• purple

Acid substances are ..., while basic substances are ....

(please answer respectively)

• can conduct electricity; cannot conduct electricity

• not soluble in water; soluble in water

• magnesium hydroxide; sodium bicarbonate

• corrosive; caustic

Carbonated drink is belong to ... substance.

• acid

• base

• salt

• all answers are correct

Citric acid is generally to be found in ...

• vinegar

• orange

• tomato

• tamarind

Acids obtained from natural substance is including ...

• lactic acid

• nictric acid

• both answers are correct

• both answers are not correct

Following answers are including the base substances ...

• baking soda, soap, antacid

• hand sanitizer, protein, shampoo

• soap, shampoo, carbonated drink

• window cleaner, tomato, baking soda

Base substances have pH in the range of ...

• 1-7

• 7-14

• 1-4

• 4-7

Please give me your responses and suggestions regarding the tutor, I really appreciate your honest responses:)