Zn + 2HCl \(\longrightarrow \) ZnCl₂ + ____\(​​​​\uparrow \)(H_2' O_2' CO₂)

(a)

H₂

(b)

O₂

(c)

CO₂

(d)

CO₂

Apple contains malic acid. Orange contains_______

(a)

citric acid

(b)

ascorbic acid

(c)

Tartaric acid

(d)

Oxalic acid

pH value of human blood is_________

(a)

7.0

(b)

7.4

(c)

7.6

(d)

7.6

The nature of the tooth paste commonly used is in nature

(a)

acidic

(b)

basic

(c)

neutral

(d)

neutral

You are given pure water to test the pH value using pH paper. It shows colour

(a)

White

(b)

black

(c)

green

(d)

black

The hydrated salt of copper sulphate has______colour

(a)

Red

(b)

White

(c)

Blue

(d)

Pink

Give the significance of pH of soil in agriculture.

What are the various uses of Aquaregia.

What are the uses of Plaster of Paris?

Why does distilled water not conduct electricity whereas rain water does?

Plaster of Paris should be stored in a moisture proof container. why?

Sulphuric acid is called King of Chemicals. Why is it called so?