Acids are ________ in taste.

(a)

sour

(b)

sweet

(c)

bitter

(d)

salty

In acidic solutions blue litmus changes into ______ colour.

(a)

blue

(b)

green

(c)

red

(d)

white

Sodium hydroxide is a ________

(a)

acid

(b)

base

(c)

oxide

(d)

alkali

Magnesium hydroxides are used for treating_______

(a)

acidity

(b)

head pain

(c)

teeth decay

(d)

None of these

We brush our teeth with tooth paste because it is __________ in nature.

(a)

basic

(b)

acidic

(c)

basic and acidic

(d)

None of these