acids bases

Colour of litmus in ammonium hydroxide

• blue

• red

• orange

• black

Blue litmus paper is held in dry HCl fume,

• Turn to red

• Turn to blue

• Turn to green

• no change

Soluble base in water is,

• metallic oxide

• alkali

• metallic hydroxide

• none of the above

Salt of carbonic acid and zinc will be a

• neural salt

• acidic salt

• basic salt

• not reacts

When a small piece of sodium is added to water,

• It will explodes with fire

• vigorous movement of metal piece

• Change the phenolphthalein added into pink

• all of the above

Al2O3 reacts with NaOH to form

• Salt and H2

• Salt and CO2

• Salt and water

• None

Universal indicator in a reaction of adequate amount of acid and base,

• red

• purple blue

• green

• orange

Methyl orange added to soda water

• turns blue

• turns purple

• turns red

• turns green

Acid base indicator for visually impaired child

• Litmus

• vanilla essence

• turmeric

• universal indicator

pH of rain water in a pollution free area

• 10

• 5.6

• 7

• 7,4