_ _ _ _ _ are sour to taste, turn blue litmus to red, and dissolve in water release H+ ions.

• ALKALI

• ACID

• BASE

• SALT

_ _ _ _ _ the substances which are bitter to taste and soapy to touch. They turn red litmus solution blue. They give "OH" ions in aqueous solution.

• ALKALI

• ACID

• BASE

• SALTS

EG. of ACID

• HYDROCHROLIC ACID

• VINEGAR

• POTASSIUM HYDROXIDE

• SULPHURIC ACID

_ _ _ _ _ the substance which change their colour/smell in different types of substances.

• INDICATOR

• pH SCALE

NATURAL INDICATOR

• LITMUS

• RED CABBAGE

• HYDRANGEA PLANT

• TURMERIC

SYNTHETIC INDICATOR

• PHENOLPHTHALEIN

• LITMUS

• HYDRANGEA PLANT

• METHYL ORANGE

Pop test: When a burning candle is brought near a test tube containing hydro gas it put off with a 'Pop' sound. This test is conducted for examining the _ _ _ _ _ .

• ABSENCE OF HYDROGEN GAS

• PRESENCE OF DIHYDROGEN MONOXIDE

• ABSENCE OF CARBON DIOXIDE

• PRESENCE OF HYDROGEN GAS

While diluting acids, it is recommended that the acid should be added to water and not water to acid because the process of dissolving an acid or a base in water is _ _ _ _ _.

• HIGHLY EXOTHERMIC

• HIGHLY ENDOTHERMIC

Mixing an acid or a base with H₂O results in _ _ _ _ _

• INCREASE IN CONCENTRATION

• NEUTRAL SOLUTION

• DECREASE IN CONCENTRATION

Mixing an acid or a base with H₂O results in decrease of concentration of ions. Such a process is called as _ _ _ _ _.

• NEUTRALIZATION

• DILUTION

• RUSTING

• GALVANISATION