112) What causes corrosion of iron?

A) Exposure to sunlight
B) Reaction with oxygen and moisture
C) Contact with acids
D) Both Reaction with oxygen and moistureand Contact with acids

113) What is the process called when fats and oils are oxidised and their smell and taste change?

A) Corrosion
B) Rancidity
C) Combustion
D) Oxidation

114) If someone in your family is suffering from acidity after overeating, which of the following would you suggest as a remedy?

A) Lemon juice
B) Vinegar
C) Baking soda solution
D) Saltwater

115) Which of the following can be used as olfactory indicators?

A) Vanilla essence, turmeric and clove oil
B) Red cabbage, vanilla essence and onion
C) Turmeric, onion and litmus
D) Vanilla essence, onion and clove oil

116) Phenolphthalein is used as an indicator in the reaction between

A) acid and base
B) acid and metal
C) base and metal oxide
D) acid and non-metallic oxide