LANGUAGE OF CHEMISTRY

Question 1

A pure substance can only be
a.Element
b.Compound
c.Element and Compound
d.Mixture

Answer 1

c.Element and compound

Question 2

A pure substance which contains only one types of atom is called
a.A compound
b.An element
c.Solid
d.Liquid

Answer 2

b.element

Question 3

The father of Chemistry is
a.Priestley
b.lavoiser
c.Dalton
d.Mendeleev

Answer 3

b.Lavoiser

Question 4

What is the symbol of Tungsten?
a.Au
b.Sb
c.Ti
d.W

Answer 4

d.W

Question 5

What is the symbol of Tin?
a.Sn
b.Sb
c.W
d.Pb

Answer 5

a.Sn

Question 6

What is the Latin name of mercury?
a.Hydrogyrum
b.Argentum
c.Stannum
d.Wolfram

Answer 6

a.Hydrogyrum

Question 7

A symbol not only represents the name of the element but also it’s:
a.Atomic number
b.Atomic mass
c.Atomicity
d.Atomic volume

Answer 7

c.Atomicity (no.of atom in molecule of elements)

Question 8

Hydrogyrum is Latin name of element
a.Mercury
b.Lead
c.Hydrogen
d.Oxygen

Answer 8

a.Mercury

Question 9

The metal which doesn’t exist in solid state is
a.Iron
b.Lead
c.Mercury
d.Sodium

Answer 9

c.Mercury

Question 10

Metal are characterized by
a.mallaeble and ductile
b.High melting point and high boiling point
c.Good conductor
d.all of these

Answer 10

D.all of these

Question 11

Most metals are
a.noble
b.electropositive
c.electronegative
d.b or c

Answer 11

b.electropositive

Question 12

Non-metal can exist in
a.solid
b.liquid
c.gaseous state
d.all are correct

Answer 12

d.all of these

Note:-
Metal cannot exist in gaseous state

Question 13

Non metal that conduct electricity
a.white phosphorus
b.graphite
c.black phosphorus
d.both b and c

Answer 13

D.both b and c

Question 14

Which one of the following are metalloid?
a.Au
b.As
c.Ag
d.Pt

Answer 14

b.As

Question 15

Compounds obtained from living source.
a.inorganic subs
b.organic subs
c.non-organic subs
d.all

Answer 15

b.organic substance

Question 16

Which is not an organic compound
a.oil
b.enzyme
c.washing soda
d.vitamins

Answer 16

c.washing soda

Question 17

Air is
a.homogenous mixture
b.heterogenous mixture
c.both
d.None

Answer 17

a.homogenous mixture

Question 18

Mixture of gases at separated by method
a.Dialysis
b.Ultra filtration
c.Atomolysis
d.Diffusion

Answer 18

c.Atomolysis

Question 19

The reaction Zn+H²SO⁴——>ZnSO⁴+H²⬆️ is an example of
a.Displacement rxn
b.Combustion rxn
c. Decomposition rxn
d.Polymerization rxn

Answer 19

a.Displacement rxn

Question 20

A photochemical reaction ________light
a.convery heat into
b.accompanied with the emissionpf
c.catayzed by
d.initiated by

Answer 20

d.initiated by ( यो चाहिन्छ)

Question 21

The term ‘atom ‘was first introduced by
a.Thomson
b.Dalton
c.Stoney
d.Avogadro

Answer 21

b.Dalton

Question 22

The total no.of element occuring naturally are:-
a.92
b.107
c.115
d.123

Answer 22

a.92

Question 23

Which one exist in free state
a.Na
b.Zn
c.Ca
d.Au

Answer 23

d.Au

Question 24

The 2nd most abundant element on Earth crust
a.Oxygen
b.Silicon
c.Al
d.Iron

Answer 24

b.Silicon

Question 25

How many protons,electrons and neutrons are present in the element? X⁴³? ²² a.22,21,21 b.21,21,22 c.22,22,22 d.22,21,22

Answer 25

b.21,21,22 22=e=p+=z

Question 26

The species having same atomic number but different mass number is a.Isotopes b.Isotones c.Isobar d.Isodiapher

Answer 26

a.Isotopes 🧠Note🧠 Isotopes:- Same atomic number different atomic mass Eg.1H¹,1 H², 1H³ Isotones Elements with same no.of neutrons but different no.of protons Isobar Elements with same mass number but different atomic number eg.18 Ar⁴⁰,19 K⁴⁰,20 Ca⁴⁰

Question 27

The no.of fundamental particles in an atom of the lightest isotope carbon are :- a.6 b.12 c.18 d.24

Answer 27

c.18 *12 C⁶

Question 28

Na+ is isoelectronic with a.Ca2+ b.Mg2+ c.Zn2+ d.Cu2+

Answer 28

b.Mg2+

Question 29

The fractional atomic weight of an element is because:- a.existence of allotropic form b.equivalent no.are whole number c.of existence of isotope d.valency of element has fractional value

Answer 29

c.of existence of isotope

Question 30

Isobar have same no.of a.electron b.protons c.neutrons d.Nucleons

Answer 30

d.Nucleons Sum of protons and neutrons

Question 31

What kind of reaction occurs in the reaction CH⁴+O²➡️CO²+H²O a.reduction b.combustion c.Single displacement d.Double displacement

Answer 31

b.Combustion oxygen aayera

Question 32

The compound having same molecular formula but possess different properties are known as:- a.Isotopes b.Isomers c.Isobar d.Isochores

Answer 32

b.Isomers

Question 33

NH⁴CNO➡️NH²CONH² This reaction is called a.Elimination b.substitution c. rearrangement d. Condensation

Answer 33

c. Rearrangement

Question 34

No.of electron present in CO² is:- a.22 b.44 c.11 d.24

Answer 34

a.22

Question 35

Radius of an atomic nucleus is in the order of a.10-⁸cm b.10-¹⁰cm c.10-¹²cm d.10-¹⁵cm

Answer 35

c.10-¹²cm Another answer 10-¹⁰m

Question 36

The no.of electrons in an atom is equal to:- a.Atomic weight b.Equivalent weight c.Atomic number d.Electron Affinity

Answer 36

c.Atomic number

Question 37

Crystallization is based on difference in their a.BP b.Solubility c.MP d.Crystal Structure

Answer 37

b.Solubility