Acids ,Bases and Salts

which of the following are indicators

• mythel orange

• china rose

• lime soda

• Phenolphthalein

• chalk

which of the following are true about bases

• they are bitter in taste

• they are not soapy to touch

• turns blue litmus paper red

• not all bases are soluble in water

which colour does Ph strip turn when it is in contact with very strong base

• green ( Ph7)

• red ( ph2 )

• dark purple ( ph14)

Identify basic salt.

• Sodium chloride

• Ammonium chloride

• Sodium acetate

• Copper acetate

   An element X forms a hydroxide which dissolves both in acids and in alkalis. What could X be ?

• Aluminium           

• Calcium   

• Copper

• Iron

   Which of the following is  spread on icy roads to melt ice in cold countries ?

• Sodium bicarbonate        

• Rock salt        

• Sodium hydroxide      

• None of these

Tomato is a natural source of which acid?

• Acetic acid

• Citric acid

• Tartaric acid

• Oxalic acid

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

• Baking powder

• Ammonium hydroxide solution

• Hydrochloric acid

• Lime

Guava contains __________ acid.

• Citric acid

• Carbonic acid

• Lactic acid

• Oxalic acid

What is formed when zinc reacts with sodium hydroxide?

• Zinc hydroxide and sodium

• Sodium zincate and hydrogen gas

• Zinc oxide and hydrogen gas

• Sodium zincate and water