Question

(1)Glass is made of the mixture of
(a) quartz and mica
(b) sand and salt,
(c) sand and silicates
(d) None of the above
(2)Which one of the following
metals has the highest density?
(a) Gold
(b) Iron
(c) Platinum (d) Lead
(3)The quantum theory was first
enunciated by
(a) Niel Bohr
(b) Albert Einstein
(c) Max Planck
(d) Max Born
(4)The noble gases do not react
with any other atom because
(a) they are heavy elements
(b) they are stable compounds
(c) their outermost orbits contain
eight electrons​

Answer 1

(1)Glass is made of the mixture of

(a) quartz and mica

(b) sand and salt,

(c) sand and silicates

(d) None of the above

Ans:- Glass is made up of quartz & mica .

So, the required option is (a) Quartz and Mica.

(2)Which one of the following metals has the highest density?

(a) Gold

(b) Iron

(c) Platinum

(d) Lead

Ans:- Gold has highest density .

So, the required option is (a) Gold.

(3)The quantum theory was first enunciated by

(a) Niel Bohr

(b) Albert Einstein

(c) Max Planck

(d) Max Born

Ans:- Neil Bohr enunciated the first quantum theory.

So, the required option is (a) Neil Bohr.

(4)The noble gases do not react with any other atom because

(a) they are heavy elements

(b) they are stable compounds

(c) their outermost orbits contain eight electrons.

Ans:- Noble gases do not react with any other atom because their outermost orbits contain eight electrons.

So , the required option is (d) their outermost orbits contain eight electrons.

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Answer 2

Answer:

Question No 1 :-

❶ Glass is made of the mixture of :

(a) quartz and mica

(b) sand and salt

(c) sand and silicates

(d) None of the above

Answer :-

$\mapsto$ Glass is made of the mixture of :

$\implies \sf\boxed{\bold{\red{a)\: Quartz\: and\: mica}}}$

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Question No 2 :-

❷ Which one of the following metals has the highest density ?

(a) Gold

(b) Iron

(c) Platinum

(d) Lead

Answer :-

$\mapsto$ The metals has the highest density is :-

$\implies \sf\boxed{\bold{\red{a)\: Gold}}}$

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❸ The quantum theory was first enunciated by :

(a) Neil Bohr

(b) Albert Einstein

(c) Max Planck

(d) Max Born

Answer :-

$\mapsto$ The quantum theory was first enunciated by :

$\implies \sf\boxed{\bold{\red{a)\: Neil\: Bohr}}}$

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❹ The noble gases do not react with any other atom because :

(a) They are heavy elements

(b) They are stable compounds

(c) Their outermost orbits contain eight electrons :

Answer :-

$\mapsto$ The noble gases do not react with any other atom because :

$\implies \sf\boxed{\bold{\red{c)\: Their\: outermost\: orbits\: contain\: eight\: electrons}}}$

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EXTRA INFORMATION :-

❒ Mendeleev's Periodic Law :

• In 1869, Mendeleev put forward the periodic law through which he established the relationship between atomic weight of an element to its physical and chemical properties.

❒ Periodic Table :

• On the basis of his periodic law, Mendeleev constructed a table by their atomic weights. This table is known as Mendeleev's Periodic Table.