Free Printable chemical combinations

1.

When a nonmetal gains or shares by two electrons, its valency will be ….

a)

tetravalent

b)

monovalent

c)

divalent

2.

All of the following elements are divalent except ……

a)

₁₂ Mg

b)

₇N

c)

₈O

d)

₁₆S

3.

The valency of ferrous is………

a)

monovalent

b)

divalent

c)

trivalent

4.

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

a)

(3) or (5)

b)

(5) or (6)

c)

(7) or (1)

5.

The valency of argon (₁₈Ar) is …………

a)

trivalent

b)

divalent

c)

monovalent

d)

zero

6.

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

a)

phosphate

b)

nitrate

c)

hydroxide

d)

bicarbonate

7.

The chemical formula of carbonate group is .........

a)

(NO₃)^-

b)

(SO₄)^--

c)

(NH₃)⁺

d)

(CO₃)^--

8.

Nitrate and nitrite groups are different in the …….

a)

type of atoms

b)

number of atoms

c)

valency

d)

type of charge

9.

Each aluminum atom (₁₃AI) combines with .......... atoms of chlorine (₁₇CI) to form aluminum chloride molecule.

a)

two

b)

three

c)

four

d)

five

10.

The chemical formula of sodium hydroxide is...

a)

NaHCO₃

b)

NaCO₃

c)

NaOH

11.

The number of atoms in ammonium nitrate( NH₄NO₃ )molecule equals …...

a)

5

b)

9

c)

8

d)

7

12.

When a nitrogen atom ₇N gains electrons to complete its outermost shell, it becomes ……….

a)

N^-2

b)

N⁺²

c)

N^-3

13.

The triple covalent bond is formed in ............... molecule.

a)

hydrogen

b)

nitrogen

c)

. oxygen

14.

If (₁₃Al) combines with (₈0), the chemical formula of the formed compound is ........

a)

Al₃O₂

b)

AlO

c)

Al₂O₃

15.

............... is a liquid metal.

a)

Mercury

b)

Nitrogen

c)

Magnesium

16.

The chemical formula of hydrochloric acid is ..............

a)

H₂O

b)

HCI

c)

H₂SO₄

17.

There is a single covalent bond in ............... molecule.

a)

hydrogen

b)

nitrogen

c)

oxygen

18.

All of the following are metals except ..............

a)

iron

b)

oxygen

c)

copper

d)

sodium

19.

During chemical reactions, (₁₉K) atom loses electron(s) and changes into ....

a)

K⁺

b)

K⁺²

c)

K^-2

20.

The type of bond in water molecule ...............

a)

covalent

b)

single covalent

c)

double covalent

21.

The number of known elements up till now is ............... elements.

a)

90

b)

100

c)

118

d)

120

22.

All the following elements can form positive ions except.

a)

sodium ₁₁Na

b)

chlorine ₁₇C1

c)

magnesium ₁₂Mg

d)

aluminum ₁₃A1

23.

All nonmetals don't conduct electricity except ………..

a)

bromine

b)

aluminum

c)

graphite

d)

mercury

24.

All these elements can participate in chemical reactions except ...............

a)

sodium Na

b)

neon Ne

c)

hydrogen H

d)

nitrogen N

25.

The bond in sodium chloride molecule is ............... Bond.

a)

single covalent

b)

triple covalent

c)

double covalent

d)

ionic

26.

When an acid dissolves in water , it produce ............... Ions.

a)

OH^-

b)

H⁺

c)

H^-

27.

All these substances turn litmus paper to blue except ...............

a)

NaOH

b)

KOH

c)

Ca(OH)₂

d)

HBr

28.

The salt that is formed on combination of a positive metal ion with a negative atomic group is ...............

a)

NaCl

b)

Na₂CO₃

c)

(NH₄)₂SO₄

d)

NaBr.

29.

The chemical formula of sulfuric acid is ....................

a)

$H_2O$

b)

$H_2SO_4$

c)

$HNO_3$

d)

HCl

30.

In the compound XO $X_2O_3$ ,the valency of element X is ……………….

a)

monovalent

b)

divalent

c)

trivalent

d)

bentavalent

31.

The chemical formula of Magnesium oxide is .......................

a)

MgO

b)

$MgCl_2$

c)

$Mg_2O$

d)

$MgSO_4$

32.

The chemical formula of Magnesium carbonate is .......................

a)

$MgCO_3$

b)

$MgCl_2$

c)

$Mg_2O$

d)

$MgSO_4$

33.

The chemical formula of calcium nitrate is .......................

a)

$CaCO_3$

b)

$CaCl_2$

c)

$Ca\left(NO_3\right)_2$

d)

$CaNO_3$

34.

The chemical formula of Potassium sulfate is .......................

a)

$K_2CO_3$

b)

$K_2SO_4$

c)

$KNO_3$

d)

$K\left(SO_4\right)_2$

35.

The chemical formula of sodium carbonate is .......................

a)

$Na_2CO_3$

b)

$NaCl_{ }$

c)

$Na_2O$

d)

$Na_2SO_4$

36.

In the compound XO $X_2\left(SO_4\right)_3$ ,the valency of element X is ……………….

a)

monovalent

b)

divalent

c)

trivalent

d)

bentavalent

37.

Inert gases Not Share in the chemical reaction Because ..........

a)

the outermost energy level completed by electrons

b)

the outermost energy level contains 1 , 2 or 3 electrons

c)

the outermost energy level contains 5 , 6 or 7 electrons

d)

They are very active

38.

In the compound XO $X\left(OH\right)_2$ ,the valency of element X is ……………….

a)

monovalent

b)

divalent

c)

trivalent

d)

bentavalent

39.

The covalent bond arises between

a)

metal and nonmetal

b)

metal and metal

c)

nonmetal and nonmetal

d)

metal and inert gas

40.

The ionic bond arises between

a)

metal and nonmetal

b)

metal and metal

c)

nonmetal and nonmetal

d)

metal and inert gas

41.

Metals tend to ............... electrons during the chemical reaction and change into ............... ion

a)

lose - negative

b)

lose - positive

c)

gain - negative

d)

gain - positive

42.

Nonmetals tend to ............... electrons during the chemical reaction and change into ............... ion

a)

lose - negative

b)

lose - positive

c)

gain - negative

d)

gain - positive

chemical combinations

Total questions: 42

Worksheet time: 21mins

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