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SKYLIGHT LANGUAGE SCHOOL PREP ONE

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

The number of known elements up tell now is …………. Elements.

a)

92

b)

121

c)

115

d)

118

2.

The number of energy levels in sodium ion is ………… the number of energy levels in its atom.

a)

equal to

b)

more than

c)

less than

d)

no correct answer

3.

The elements which has atomic number 12 is considered from ……….

a)

metals.

b)

nonmetals.

c)

noble gases.

d)

no correct answer

4.

All of the following are examples of single covalent bonds except …….

a)

H2

b)

N2

c)

HCl

d)

H2O

5.

All of the following elements are divalent except ………….

a)

12Mg

b)

7N

c)

8O

d)

16S

6.

Nitrate and nitrite groups are different in the ……….

a)

type of atoms

b)

valency

c)

number of atoms

d)

no correct answer

7.

The salt that is formed on the combination of positive metal ion with negative atomic group ………

a)

NH4Cl

b)

Na2SO4

c)

(NH4)2CO3

d)

NH4Br

8.

All of these substances turns litmus paper into red except ………

a)

HCl

b)

NaOH

c)

HNO3

d)

H2SO4

9.

All of these salts dissolve in water except……….

a)

sodium chloride.

b)

potassium chloride.

c)

silver chloride.

d)

sodium sulphide.

10.

In trivalent elements, the outermost energy level contains……. electrons.

a)

(3) or (5)

b)

(7) or (1)

c)

(5) or (6)

d)

(6) or (3)

11.

ALL elements are metals except ………………

a)

iron

b)

oxygen

c)

sodium

d)

copper

12.

Phosphate and sulphate groups are different in the…………

a)

types of atoms.

b)

valency

c)

number of atoms

d)

types of atoms and valency

13.

The chemical formula of calcium bicarbonate is ………….

a)

CaCO3

b)

Ca H(CO3)2 

c)

Ca (HCO3)2

d)

CaHCO3

14.

When an alkali(base) dissolves in water, it gives ……..ions.

a)

H+

b)

(OH)-

c)

(OH)-2

d)

(OH)+

15.

On the combination of (Mg)+2 ion with (CO3)-2 group, …….. is formed.

a)

an acid

b)

a base

c)

a covalent

d)

a salt

16.

The bond in oxygen molecule is a/an ………… bond.

a)

ionic

b)

single covalent

c)

double covalent

d)

triple covalent

17.

The chemical reaction are used in ……………

a)

food industry.

b)

medicine industry.

c)

fertilizers industry.

d)

all of the previous answers.

18.

All of the following are monovalent atomic groups except………….. .

a)

hydroxide

b)

bicarbonate.

c)

phosphate.

d)

nitrite.

19.

The mass of molecules of sodium hydroxide equals …… gm.

[knowing that the atomic mass of Na =23, H=1 and O=16].

a)

80

b)

40

c)

20

d)

10

20.

When an element (11X) combines with oxygen, the symbol of the produced oxide is …………

a)

XO

b)

X2O

c)

XO2

d)

X2O3

21.

From properties of graphite element that……….

a)

it is a good conductor of electricity.

b)

it is malleable and ductile.

c)

it has a metallic luster.

d)

no correct answer.

22.

The changing of lithium atom (Li) into lithium ion (Li+) means it …..

a)

gains proton.

b)

gains electrons

c)

loses proton

d)

loses electrons.

23.

All of the following elements change into negative ions during chemical reactions except …………

a)

12Mg

b)

8O

c)

7N

d)

17Cl

24.

Sulphoric acid is characterized by all of the following excepts……

a)

is chemical formula is H2SO4.

b)

is mineral acid.

c)

it changes a color of litmus into red.

d)

it has a bitter taste.

25.

The following elements are good conductors of electricity except….

a)

8O

b)

11Na

c)

26Fe

d)

13Al

26.

The number of atoms of ammonium nitrate molecule equal……..

a)

5

b)

8

c)

7

d)

9

27.

When an acid dissolve in water, it produces ……… ions.

a)

H-

b)

(OH)+

c)

H+

d)

(OH)-

28.

Sodium Chloride is……………

a)

an acid

b)

a base

c)

an oxide.

d)

a salt

29.

All of these are nonmetals oxides except……….

a)

CO2

b)

P2O5

c)

SO3

d)

Al2O3

30.

All of substances turn litmus paper into red except…………

a)

HCl

b)

HNO3

c)

NaOH

d)

H2SO4

31.

The chemical formula of calcium bicarbonate is ………….

a)

Ca(HCO3)2

b)

Ca(CO3)2

c)

CaCO3

d)

CaC

32.

Sodium hydroxide is……………

a)

an acid

b)

a base

c)

an oxide.

d)

a salt

33.

the electronic configuration of 19K ion , is similar to the electronic configuration of ………………… ion

a)

18Ar

b)

11Na

c)

12Mg

d)

17Cl

34.

All the following are covalent molecules except ……….

a)

H2O

b)

MgCl2

c)

CO2

d)

H2

35.

carbonate and bicarbonate groups are different in the ……….

a)

type of atoms

b)

valency

c)

number of atoms

d)

all the previous

36.

the number of electron in the outermost energy level of (O-2 ) equal to the number of electron in the outer most energy level of …………….ion

a)

18Ar

b)

11Na

c)

12Mg

d)

17Cl

37.

in the positive ion the number of positive protons is ……..than the number of negative electrons

a)

equal to

b)

more than

c)

less than

d)

no correct answer

38.

The bond in nitrogen molecule is a/an ………… bond.

a)

ionic

b)

single covalent

c)

double covalent

d)

triple covalent

39.

When an acid dissolve in water, it produces ……… ions.

a)

H-

b)

(OH)+

c)

H+

d)

(OH)-

40.

alkalis turns the red litmus paper into ..................

a)

yellow

b)

green

c)

blue

d)

black

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