Acids Bases and Salts

Curd, lemon juice, orange juice and vinegar taste sour because they contain ____________

• neutral

• acids

• salts

• bases

The word acid comes from the ________ word _________ which means __________

• Greek word acid which means salty

• Latin word acere which means sour

• Persian word acide which means bitter

• French word acer which means sweet

Substances which taste bitter and feel soapy on touching are known as

• Acids

• Bases

• Salts

• Neutral

Special type of substances are used to test whether a substance is acidic or basic. These substances are known as __________

• Litmus paper

• China rose

• Turmeric

• Indicators

The most commonly used natural indicator is _________ it is extracted from_________

• China rose extracted from China rose plant

• Turmeric extracted from turmeric plant

• Litmus extracted from lichens

• phenolphthalein extracted from lichens

The solutions which do not change colour of either red or blue litmus are known as __________ solutions.

• neutral

• acidic

• basic

• salty

china rose indicator turns acidic solutions to_________

• dark pink

• green

• yellow

• red

china rose indicator turns basic solutions to _________

• dark pink

• green

• yellow

• red

when a solution is basic phenolphthalein gives a _________ colour.

• blue

• yellow

• pink

• red

Phenolphthalein remains __________ when a solution is acidic.

• blue

• yellow

• pink

• colourless