Carbon (Class IX) Online Test

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Carbon (Class IX)

Description: Carbon
Number of Questions: 15
Created by: Muni Gupte
Tags: Carbon Allotropes of Carbon Physical Properties and Chemical Properties of Carbon Availability of Carbon (Free and Combined State) and Uses CO2 (Greenhouse Gas and Global Warming) Measures to Keep Balance of CO2 in Air and Pollution of Air by CO

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Buckminsterfullerene is an allotropic form of

phosphorus
sulphur
carbon
tin

Graphite is an allotrope of carbon. Which of the following is not a property of graphite?

It is lighter than diamond.
It does not conduct electricity.
It has a very high melting point.
It burns to form carbon dioxide.
Graphite is a greyish-black opaque substance.

Why does carbon form a large number of compounds?

a. Because of its property of catenation b. Because of its tetravalency c. Because it exhibits isomerism

Only a
Only b
Only c
All of the above

Which of the following statements is/are true for carbon?

(a) Carbon can form only four single covalent bonds. (b) It can form single, double and triple bonds. (c) To complete its octet, carbon has to form three bonds. (d) To complete its octet, carbon has to form four bonds.

Only (a) and (c)
Only (b) and (d)
Only (b)
Only (d)

In which of the following forms does carbon occur in free state?

Carbonates
Fossil fuels
Carbon dioxide gas
Graphite
Organic compounds

Which of the following statements is not applicable to carbon compounds?

They have low melting and boiling points.
They are ionic in nature.
They form homologous series.
They are generally soluble in organic solvents.

Most of the common fuels are either free carbon or carbon compounds. Which of the following common fuels contain free carbon?

a. Petrol b. Coal c. Kerosene d. Charcoal

Only a and b
Only b and c
Only a and c
Only b and d
Only a and d

Incomplete combustion of fuels, such as petrol and diesel, gives

nitrogen oxide
sulphur dioxide
carbon monoxide
carbon dioxide

Which of the following statements is/are false?

a. The amount of carbon present in the earth's crust in the form of minerals is only 0.02%. b. Carbon atoms can achieve the inert gas electron arrangement only by the sharing of electrons. c. Carbon and its compounds burn in air to give carbon dioxide gas that turns lime water black.

Only a
Only a and b
Only b
Only c
Only b and c

Which of the following is/are the major cause of air pollution in big cities?

Fossil fuels
Acid rain
Heat of dispersion
Sewage waste
None of these

Global warming can be controlled by

increasing deforestation and slowing down the growth of human population
increasing deforestation and reducing efficiency of energy usage
reducing deforestation and cutting down the use of fossil fuels
reducing reforestation and increasing the use of fossil fuels

Which of the following options correctly describes greenhouse effect?

The retention of heat energy by greenhouse gases
When rainwater becomes acidic due to the presence of sulphur and nitogen
Planting of trees in order to reduce air pollution
The release of oxygen during photosynthesis
None of these

The atmospheric pollutant that can cause an increase in the atmospheric temperature is

H₂S
NO
CO₂
SO₂

Diamond is harder than graphite, though both of them are allotropes of carbon. This is due to the

hexagonal structure of diamond
difference in their electronic configuration
difference in the size of their crystals
difference in the strength of their respective intermolecular forces

How does photosynthesis reduce global warming?

Photosynthesis gives out O₂.
Photosynthetic plants absorb toxins from air.
It decreases the concentration of CO₂.
Photosynthetic plants bring rain.

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Carbon (Class IX)

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