Chapter-8 chemical reactivity

 

Objective Part

Choose the right option.                                                                 10×1=10

 

A

B

C

D

1

Metals can form ions carrying charges:

Unipositive

Dipositive

Tripositive

All of them

2

Which of the is less malleable:

Sodium

Iron

Gold

Silver

3

Which one of the following non-metal is lustrous:

Sulphur

Phosphorous

Iodine

Carbon

4

The highest electronegative element in periodic table is:

Fluorine

Chlorine

Bromine

Iodine

5

Non-metals are essential:

For the maintenance

For the existence

For the safety of life

All of them

6

Non-metals are electronegative in nature and form ___ oxides.

Acidic

Basic

Neutral

None of these

7

______ and gold exist in free elemental form in nature.

Silver

Sodium

Mercury

Platinum

8

Zinc, iron and tin are ______ elements.

Very reactive

Moderately reactive

Least reactive

Non reactive

9

Which one of the following is brittle?

Sodium

Aluminium

Selenium

Magnesium

10

Metals which are easily oxidized are said:

Negative metals

State metals

Reactive metals

Non-reactive metals

 

 

Subjective

Answer the short questions.                                                                                           10×2=20

1.      Why the second ionization energy of magnesium is higher than the first one?

2.      Why copper is used for making electrical wires?

3.      Why ionization energy of Na is less than Mg?

4.      Write down some properties of gold.

5.      Why platinum is used for making jewelry?

6.      Why is HF a weak acid?

7.      What is difference between metals and non-metals?

8.      How oxygen reacts with group II A metals?

9.      What is relationship between electropositivity and ionization energy?

10.  What do you mean by 24 carat gold?

 

 Long Questions        5×1=5

1.      (a) Write a note on the significance of non-metals.                                                         2.5

(b)  Compare and contrast the properties of alkali and alkaline earth metals.                 2.5