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Carbon and its compounds Yash

Total questions: 46

Worksheet time: 16mins

Name
Class
Date
1.

What type of bond is found in Carbon?

a)

Ionic

b)

Dative

c)

Covalent

d)

None

2.

Valency and valence electrons in carbon are

a)

2 and 4 respectively

b)

4 and 6 respectively

c)

2 and 6 respectively

d)

4 and 4 respectively

3.

What hydrocarbon produces when burnt in air?

a)

Oxygen , Carbon dioxide and water

b)

Hydrogen and carbon dioxide

c)

Carbon dioxide and water

d)

Hydrogen, oxygen and carbon dioxide

4.

What properties of carbon helps it in forming a large number of compounds

a)

Covalent bond and atmic number

b)

Catenation and tetravalency

c)

Tetravalency andvalence electro

d)

Valence electrons

5.

Which of the following are unsaturated hydrocarbon

a)

Ethene

b)

Propyne

c)

Ethane

d)

Benzene

6.

Pick odd one out

a)

C2H6

b)

C2H4

c)

C2H2

d)

C3H4

7.

Which of the following represents the element A

a)

Carbon

b)

Hydrogen

c)

Nitrogen

d)

Oxygen

e)

Sulphur

8.

What do you mean by allotropy

a)

Property of an element to have different atomic number

b)

Property of element to exist in different form

c)

Property of element to take part in chemical reaction

d)

Property of carbon to form covalent bonds

e)

None of the above

9.

Which of the following is/are property of covalent bonds

a)

Strong bonds within molecules

b)

Weak inner molecular forces

c)

Good conductor of heat and electricity

d)

Formed by mutual sharing of electrons

e)

Formed by exchanging ions

10.

Hardest substance known on earth is :

a)

Carbon

b)

Tungsten

c)

Diamond

d)

Fullerene

11.

Which of the following represents a redox reaction

a)

2Mg + O2 --> 2MgO

b)

Zn + H2SO4 ----> ZnSO4 + H2

c)

CuO + H2 ----> Cu + H2O

d)

2Cu + O2 ----> 2CuO

12.

Equation of displacement reaction is :

a)

A + BC ---> AC + B

b)

AB + CD ----> AD + CB

c)

A + B ---> AB

d)

AB---> A + B

13.

Methods to prevent rancidity:

a)

Replacing oxygen with an antioxidant

b)

Galvanizing the article

c)

Keeping food in air tight container

14.

Which of the following is/are double displacement reaction reaction

a)

Neutralization reactions

b)

Precipitation reactions

c)

Combination reaction

d)

Thermal decomposition

15.

What is rusting

a)

Decaying of metals by action of moisture

b)

Formation of a brown layer on iron when , is exposed to air

c)

Corrosion of silver metal

d)

Displacement of copper by in copper sulphate solution

16.

Balance the equation by correct coefficients

a)

2,6,2,3

b)

1,6,3,2

c)

2,3,2,6

d)

3,1,6,2

17.

What are types of decomposition reactions

a)

Photolysis

b)

Thermolysis

c)

Both a and b

d)

Electrolysis

e)

both a and d

18.

What are acids

a)

Substances which dissociates on water to produce OH- ions

b)

Substances which dissociates on water to produce H- ions

c)

Substances which dissociates on water to produce OH+ ions

d)

Substances which dissociates on water to produce H+ ions

19.

What represents the correct order of products and reactants respectively

a)

Products : Base and acid

Reactants : Salt and water

b)

Products : Metal and Acid

Reactants: Hydrogen and Salt

c)

Products: Base and metal

Reactants: Salt and acid

d)

Products: Salt and Hydrogen

Reactants: Base and metal

20.

What products are formed when an acid reacts with metal oxide

a)

Salt and. Hydrogen

b)

Base and water

c)

Salt and water

d)

Hydrogen and oxygen

21.

What is dilution of acid or base

a)

Decreasing its pH

b)

Increasing its pH

c)

Decreasing H+ and OH- ions concentration

d)

Increasing H+ and OH- ions concentration

22.

Under what conditions will a farmer treat soil with calcium oxide or slaked lime

a)

Basic

b)

Acidic

c)

Both a and b

d)

Neutral

23.

What is brine

a)

Aqueous solution of sodium hydroxide

b)

Aqueous solution of sodium chloride

c)

Aqueous solution of calcium oxi-chloride

d)

Aqueous solution of water -_-

24.

Chemical name of bleaching powder:

a)

Calcium hydroxide

b)

Calcium sulphate hemihydrate

c)

Calcium sulphate dihydrate

d)

Calcium oxi chloride

e)

Calcium chloride

25.

What is baking soda

a)

NaHCO3

b)

Na2CO3

c)

NH4Cl

26.

A- Salts are the products of an acid - base reaction depends on relative nature of acid and bases

R - salts may be acidic or basic

a)

both Assertion and reason are true and reason is the correct explanation of assertion

b)

both assertion and reason are true and reason is not the correct explanation of assertion

c)

A is true R is false

d)

A is false R is true

e)

Both are true

27.

Which of the following is acidic salt

a)

NaHCO3

b)

Na2CO3

c)

CuSO4.5H2O

d)

NaHSO4

28.

What are properties of metals

a)

Electron acceptor

b)

Electron donor

c)

Forms anion

d)

Forms cation

29.

Which metal is liquid at room temperature

a)

Hg

b)

Pt

c)

Au

d)

Ag

30.

Which of the following represents correct order of reactivity

a)

Li>Na>Ca>Hg

b)

Mg<H<Zn<Pb

c)

Zn>Pb>Cu>Hg

d)

Ca<Mg<Al<Zn

31.

Elements with valency 1 are

a)

Metals

b)

Non metals

c)

Metalloids

d)

May be metals or may be non metals

32.

Metalic oxides and non-metalic are ___ and ___ in nature respectively (write "and")

(a)  

33.

Which element's anion is present in NaCl , MgCl2 and Na2O

a)

Na Mg and O respectively

b)

Cl Mg and Na respectively

c)

Cl Cl and O respectively

d)

Na Mg and Na respectively

34.

Who made law of traids

a)

Newland

b)

Dobernier

c)

Mendeleev

35.

Law of octaves was found to be applicable for the elements till

a)

Chlorine

b)

Carbon

c)

Calcium

d)

Sodium

36.

What is electronic configuration of Sulphur

a)

2,8,8

b)

2,8,7

c)

2,8,5

d)

2,8,6

37.

The average atomic number of first and last element is roughly equal to the atomic number of middle element :

The statement was obeyed by

a)

Law of traids

b)

Law of octaves

c)

Mendeleev's periodic law

d)

None of the above

38.

Which property of elements was used by Newland to classify elements

a)

Atomic number

b)

Atomic mass

c)

Valency

39.

Formula of Oxide of gallium

a)

GaO

b)

Ga2O

c)

Ga2O3

d)

GaO2

40.

Properties of elements are periodic function of their atomic number

This statement refers to:

a)

Mendeleev's periodic law

b)

Modern periodic law

c)

Law of traids

d)

Law of octaves

41.

What are isotopes

a)

Elements with same atomic mass and different atomic number

b)

Elements with same atomic number and different atomic mass

c)

Elements with same valency

d)

Elements with same number of valence electrons

42.

Where are noble gases placed in modern periodic table

a)

Group 10

b)

Group 8

c)

Group 18

d)

Group 1

43.

On moving left to right in a period the number of valence electrons

a)

Increases

b)

Decreases

c)

First increases then decreases

d)

First decreases then increases

44.

How many periods are present in modern periodic table

a)

7

b)

8

c)

18

d)

6

45.

What happens to atomic size on moving left to right and top to bottom respectively

a)

Decrease and increases respectively

b)

Increases and decreases respectively

c)

Decreases in both case

d)

Increases in both case

46.

Elements present at left of period table are

a)

Metals

b)

Non metals

c)

Metalloids

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