Chemistry : Practice Questions and Answers

Formation of slaked lime from quick lime

Heating Mercuric Oxide

Formation of Manganese Chloride from Manganese oxide

Formation of Zinc from Zinc blende

Formation of Fe (CO)5 from Fe.

Liberation of $H_2$ from steam by iron at high temperature.

Rusting of iron sheets.

Decolorization of blue $CuSO_4$ solution by iron.

One

Two

Five

One fifth

$VO_2^+ \rightarrow V_2O_3$

$Na \rightarrow Na^+$

$CrO_4^{2-} \rightarrow Cr_2O_7^{2-}$

$Zn^{2+} \rightarrow Zn$

50 mL of 0.5 M $C_2H_2O_4$

20 mL of 0.1 M $C_2H_2O_4$

20 mL of 0.5 M $C_2H_2O_4$

50 mL of 0.1 M $C_2H_2O_4$

$MnO_2$

$K_2MnO_4$

$Mn_3O_4$

$KMnO_4$

Increase in oxidation number

Decrease in oxidation number

No change in oxidation number

none of the above

Dissolution of Copper

Oxidation of Ag+ -> Ag

Reduction of Cu2+ ions

Oxidation of Cu atoms

Blue litmus solution

Red litmus solution

Universal indicator solution

Mixture of red and blue litmus solution

pH paper

litmus paper

Universal indicator

Standard ph value chart

3 to 14

0 to 14

11 to 14

0 to 11

Remains same

Increases

Decreases

Becomes 7

heat the solution in a test tube and expose the ph paper to the vapours formed

pour few drops of the solution from the test tube on the ph paper

drop the ph paper in the solution

put a drop of the solution on the ph paper using a dropper

dilute sodium bicarbonate solution

tap water

dilute sodium hydroxide solution

dilute hydrochloric acid

red, blue

red, green

green, blue

orange, green

turned blue

did not change

turned green and suddenly yellow

turned light pink

7

more than 7

less than 7

zero

Universal indicator

Blue litmus

Red litmus

Phenolphthalein

is more than 7

is less than 7

is 7

none of these

red

green

blue

violet