[5 Mark Question Answer]

Question 15 Marks

Match the compounds in List I – 1 to 20 with their correct formulas from in List II-A to T.

	List I		List II
1	Hydrochloric acid	$A$	$NaCI$
2	Potassium Hydroxide	$B$	$NaOH$
3	Sulphuric Acid	$C$	$KCI$
4	Zinc Hydroxide	$D$	$Ca(OH)_2$
5	Sodium Chloride	$E$	$CaS$
6	Nitric Acid	$F$	$CuSO_4$
7	Calcium Hydroxide	$G$	$CaCO_3$
8	Carbonic Acid	$H$	$NH_4CI$
9	Sodium hydroxide	$I$	$HCI$
10	Copper sulphate	$J$	$ZnO$
11	Potassium Chloride	$K$	$$HNO_3$$
12	Calcium Carbonate	$L$	$H_2CO_3$
13	Magnesium Sulphide	$M$	$MgS$
14	Zinc Sulphate	$N$	$MgO$
15	aluminium Hydroxide	$O$	$KOH$
16	Sodium Carbonate	$P$	$ZnSO_4$
17	Calcium Sulphide	$Q$	$Na_2CO_3$
18	Magnesium Oxide	$R$	$H_2SO_4$
19	Zinc Oxide	$S$	$AI(OH)_3$
20	Ammonium Chloride	$T$	$Zn(OH)_2$

Answer

	List I		List II
1	Hydrochloric acid	$I$	$HCI$
2	Potassium Hydroxide	$O$	$KOH$
3	Sulphuric Acid	$R$	$H_2SO_4$
4	Zinc Hydroxide	$T$	$Zn(OH)_2$
5	Sodium Chloride	$A$	$NaCI$
6	Nitric Acid	$K$	$HNO_3$
7	Calcium Hydroxide	$D$	$Ca(OH)_2$
8	Carbonic Acid	$L$	$H_2CO_3$
9	Sodium hydroxide	$B$	$NaOH$
10	Copper sulphate	$F$	$CuSO_4$
11	Potassium Chloride	$C$	$KCI$
12	Calcium Carbonate	$G$	$$CaCO_3$$
13	Magnesium Sulphide	$M$	$MgS$
14	Zinc Sulphate	$P$	$ZnSO_4$
15	aluminium Hydroxide	$S$	$AI(OH)_3$
16	Sodium Carbonate	$Q$	$Na_2CO_3$
17	Calcium Sulphide	$E$	$CaS$
18	Magnesium Oxide	$N$	$MgO$
19	Zinc Oxide	$J$	$ZnO$
20	Ammonium Chloride	$H$	$NH_4CI$

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Question 25 Marks

Match the statements in List I – 1 to 10 correct answers in List II-A to J.

	List I		LIst II
1	Fluorine and chlorine	A	Nitrogen
2	A diatomic molecule	B	Boron
3	A molecule containing the elements hydrogen and oxygen.	C	Reactants
4	A metalloid - showing properties of both metals and non-metals.	D	Chemical Formula
5	The term used for the substances which take part in the chemical reaction	E	Halogens
6	The term represents a substance by means of symbols.	F	Water
7	The term used for the substances formed as a result of a chemical reaction	G	Nitric Acid
8	A compound containing one atom of zinc and two atoms of chlorine.	H	Products
9	The chemical name for nitrogen monoxide.	I	Phosphorus
10	A polyatomic molecule.	J	Zinc Chloride

Answer

	List I		LIst II
1	Fluorine and chlorine	E	Halogens
2	A diatomic molecule	A	Nitrogen
3	A molecule containing the elements hydrogen and oxygen.	F	Water
4	A metalloid - showing properties of both metals and non-metals.	B	Boron
5	The term used for the substances which take part in the chemical reaction	C	Reactants
6	The term which represents a substance by means of symbols.	D	Chemical Formula
7	The term used for the substances formed as a result of a chemical reaction	H	Products
8	A compound containing one atom of zinc and two atoms of chlorine.	J	Zinc Chloride
9	The chemical name for nitrogen monoxide.	G	Nitric Oxide
10	A polyatomic molecule.	I	Phosporis

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Question 35 Marks

Match the non-metallic elements – with their correct symbols. Non-metallic elements are:

Non-Metallic elements	Symbol
(a) Carbon	(1) O
(b) Chlorine	(2) I
(c) Oxygen	(3) Si
(d) Phosphorus	(4) C
(e) Hydrogen	(5) Cl
(f) Nitrogen	(6) P
(g) Iodine	(7) F
(h) Bromine	(8) H
(i) Fluorine	(9) S
(j) Silicon	(10) Br
(k) Sulphur	(11) N

Answer

Non-Metallic elements	Symbol
(a) Carbon	C
(b) Chlorine	Cl
(c) Oxygen	O
(d) Phosphorus	P
(e) Hydrogen	H
(f) Nitrogen	N
(g) Iodine	I
(h) Bromine	Br
(i) Fluorine	F
(j) Silicon	Si
(k) Sulphur	S

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Question 45 Marks

Match the metallic elements – with their correct symbols Metallic elements

Metallic elements	Symbol
(a) Potassium	(1) Ca
(b) Sodium	(2) Zn
(c) Calcium	(3) Pb
(d) Magnesium	(4) Hg
(e) Zinc	(5) Cu
(f) Aluminum	(6) Au
(g) Iron	(7) K
(h) Lead	(8) Fe
(i) Copper	(9) Al
(j) Mercury	(10) Na
(k) Silver	(11) Mg
(l) Platinum	(12) Pt
(m) Gold	(13) Ag

Answer

Metallic elements	Symbol
(a) Potassium	K
(b) Sodium	Na
(c) Calcium	Ca
(d) Magnesium	Mg
(e) Zinc	Zn
(f) Aluminum	Al
(g) Iron	Fe
(h) Lead	Pb
(i) Copper	Cu
(j) Mercury	Hg
(k) Silver	Ag
(l) Platinum	Pt
(m) Gold	Au

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Question 55 Marks

Match the formulas of the following gases with their correct names :

Gases - $(a) H_2 (b) N_2(c) O_2 (d) Cl_2 (e) HCI (f) NH_3 (g) CO (h) CO_2 (i) SO_2 (j) NO (k) NO_2.$

Names:

(1) Ammonia (2) Nitrogen Dioxide (3) Oxygen (4) Hydrogen (5) Nitrogen (6) Chlorine (7) Carbon Monoxide (8) Sulphur Dioxide (9) Nitrogen Monoxide (10) Carbon Dioxide (11) Hydrogen Chloride

Answer

	Gases	Names
(a)	$H_2$	(4) Hydrogen
(b)	$N_2$	(5) Nitrogen
(c)	$O_2$	(3) Oxygen
(d)	$Cl_2$	(6) Chlorine
(e)	$HCI$	(11) Hydrogen Chloride
(f)	$NH_3$	(1) Ammonia
(g)	$CO$	(7) Carbon Monoxide
(h)	$CO_2$	(10) Carbon Dioxide
(i)	$SO_2$	(8) Sulphur Dioxide
(j)	$NO$	(9) Nitrogen Monoxide
(k)	$NO_2$	(2) Nitrogen Dioxide

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Question 65 Marks

Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.

Answer

Atoms of the same element or different elements combine to form a molecule.
Atoms of the same element forming a molecule
1. Oxygen
2. Nitrogen
3. Hydrogen.

Atomicity is the number of atoms present in one molecule of the element.

Element	Molecule	Atomicity
Hydrogen H	H_(2)	2
Nitrogen N	N_(2)	2
Oxygen O	O_(2)	2

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