chemistry MCQs - 9th class Chapter 09 Mcqs

1

Which property of Group 1 alkali metals decreases as you go down the group?

A

Reactivity

B

Density

C

Melting Point

D

Atomic Size

2

What is the general electron configuration for alkali metals?

A

ns²

B

np⁶

C

ns¹

D

np⁵

3

Which alkali metal reacts most violently with water according to the text?

A

Lithium

B

Sodium

C

Potassium

D

Cesium

4

What happens to the density of alkali metals as you move down the group?

A

It decreases

B

It remains constant

C

It generally increases

D

It becomes zero

5

The elements of Group 17 are known as:

A

Alkali Metals

B

Noble Gases

C

Transition Elements

D

Halogens

6

How does the reactivity of halogens change down the group?

A

It increases

B

It decreases

C

It stays the same

D

It increases then decreases

7

Which halogen is a red-brown liquid at room temperature and pressure (rtp)?

A

Fluorine

B

Chlorine

C

Bromine

D

Iodine

8

What is formed when a halogen reacts with an alkali metal?

A

An acid

B

A base

C

A salt

D

A new halogen

9

In a displacement reaction, a more reactive halogen will displace a _____ reactive halogen's ion from its solution.

A

more

B

less

C

equally

D

non-

10

Which of the following is NOT a characteristic property of transition elements?

A

High densities

B

Form coloured compounds

C

Low melting points

D

Variable oxidation states

11

Iron (Fe) is used as a catalyst in which industrial process?

A

Contact Process

B

Haber Process

C

Hydrogenation of oils

D

Catalytic Converters

12

Vanadium pentoxide (V₂O₅) is the preferred catalyst for the:

A

Manufacture of ammonia

B

Manufacture of sulphuric acid

C

Manufacture of margarine

D

Automobile exhaust conversion

13

The elements of Group 18 are also known as:

A

Halogens

B

Alkali Earth Metals

C

Transition Elements

D

Noble Gases

14

Why are noble gases chemically unreactive?

A

They are monatomic

B

They have low boiling points

C

Their outermost electron shells are complete

D

They are gases at room temperature

15

The ability of a metal to be hammered into thin sheets is called:

A

Ductility

B

Lustre

C

Malleability

D

Conductivity

16

Which of these non-metals is an exception and can conduct electricity?

A

Sulphur

B

Graphite

C

Phosphorus

D

Diamond

17

What are the products when lithium reacts with water?

A

Li₂O and H₂

B

LiOH and H₂

C

LiH and O₂

D

No reaction

18

As you go down Group 17, the melting and boiling points of halogens:

A

Decrease

B

Remain the same

C

Increase

D

Become unpredictable

19

The term 'Halogen' means:

A

Gas forming

B

Salt forming

C

Acid forming

D

Water hating

20

A substance that loses an electron in a chemical reaction is called a(n):

A

Oxidizing agent

B

Reducing agent

C

Catalyst

D

Inhibitor

21

Which hydrogen halide is expected to have the lowest thermal stability?

A

HF

B

HCl

C

HBr

D

HI

22

Catalytic converters in automobiles use metals like platinum, palladium, and _____ to reduce pollution.

A

Iron

B

Nickel

C

Rhodium

D

Vanadium

23

The property of metals that allows them to be drawn into wires is known as:

A

Malleability

B

Sonority

C

Tensile Strength

D

Ductility

24

Most non-metals are _____ conductors of heat and electricity.

A

good

B

super

C

bad

D

semi

25

Which element has the highest melting point among the given alkali metals?

A

Li (180 °C)

B

Na (98 °C)

C

K (64 °C)

D

Cs (28 °C)

26

According to the text, which element exists as a grey-black solid at rtp?

A

Bromine

B

Chlorine

C

Iodine

D

Fluorine

27

What is the trend for reducing power of halogens down the group?

A

It increases

B

It decreases

C

It remains constant

D

It varies randomly

28

What is the physical state of all noble gases at room temperature?

A

Solid

B

Liquid

C

Plasma

D

Gas

29

Which of these is an example of a metal mentioned in the text?

A

Sulphur

B

Oxygen

C

Copper

D

Carbon

30

Why can graphite conduct electricity?

A

It is hard

B

It is black

C

It has mobile electrons between its layers

D

It contains carbon atoms

31

The reaction of potassium with chlorine is described as:

A

Steady

B

Vigorous

C

Violent

D

Slow

32

Elements in which group have seven electrons in their outermost shell?

A

Group 1

B

Group 18

C

Group 17

D

Group 2

33

The increase in atomic size down Group 1 makes it _____ for the atoms to lose an electron.

A

harder

B

easier

C

impossible

D

no different

34

Which catalyst is used for the hydrogenation of oils to make margarine?

A

Iron

B

Platinum

C

Nickel

D

Vanadium

35

Metals are generally described as being lustrous, which means they are:

A

Dull

B

Brittle

C

Shiny

D

Soft

36

Which of these elements is a non-metal?

A

Iron

B

Gold

C

Nitrogen

D

Lead

37

What happens to the bond strength in hydrogen halides as you go down Group 17?

A

It increases

B

It decreases

C

It remains the same

D

It becomes zero

38

Which noble gas has a simple s² electronic configuration?

A

Neon (Ne)

B

Argon (Ar)

C

Krypton (Kr)

D

Helium (He)

39

Why are alkali metals soft?

A

Weak interatomic attraction

B

Strong metallic bonds

C

High density

D

Low reactivity

40

What colour is chlorine gas at rtp?

A

Pale-yellow

B

Red-brown

C

Yellow-green

D

Grey-black

41

The process in which an electron is gained is called:

A

Oxidation

B

Reduction

C

Catalysis

D

Sublimation

42

Transition elements are found in which block of the periodic table?

A

s-block

B

p-block

C

d-block

D

f-block

43

Which of these is an alkali metal?

A

Calcium

B

Sodium

C

Aluminum

D

Chlorine

44

Why do non-metals tend to be brittle?

A

They have free electrons

B

Their bonds are weak and break easily when hammered

C

They are good conductors

D

They have high densities

45

Which halogen is a pale-yellow gas at rtp?

A

Fluorine

B

Chlorine

C

Bromine

D

Iodine

46

The reaction 2Na + Cl₂ → 2NaCl is described as a _____ reaction.

A

slow

B

steady

C

vigorous

D

non-spontaneous

47

What is the main reason for the increase in melting points down Group 17?

A

Increasing atomic size

B

Stronger intermolecular forces

C

Decreasing reactivity

D

Weaker bonds

48

What type of compounds are metal halides usually?

A

Covalent

B

Ionic

C

Metallic

D

Polar

49

The Haber Process is used to produce what chemical?

A

Sulphuric Acid

B

Ammonia

C

Margarine

D

Urea

50

What causes the coloured appearance of transition metal compounds?

A

Their high density

B

Their catalytic activity

C

Their variable oxidation states

D

Their s-block electrons