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Chemistry 1 Marks Question

PART - 1 CH - 3 Classification of Elements and Periodicity in Properties · Gujarat Board (GSEB) STD 11 Science (GSEB - English Medium). 18 questions.

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18 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
The metallic oxides are basic while non-metals oxides are acidic, why?
Answer
Metallic oxide react with water to form base while non-metal oxides react with water to form acids. Hence metallic oxides are basic and non-metal oxides are acidic.
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Question 21 Mark
Arrange alkali metals in increasing order of melting point and halogen in increasing order of boiling point.
Answer
$Cs < Rb < K < Na < Li$
$
F_2 < Cl_2 < Br_2 < I_2
$
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Question 71 Mark
Arrange elements of third period in increasing order of their ionization potential.
Answer
Na < Al < Mg < Si < S
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Question 81 Mark
Arrange the following in increasing order of their size: $Cl ^{-}, S ^{-2}, Ar ^{}, Ca ^{+2}, SC ^{+3}$.
Answer
$SC ^{+3}< Ca ^{+2}< Ar < Cl ^{-}< S ^{-2}$
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Question 91 Mark
Which element of periodic table are least in size and have maximum size?
Answer
The smallest element in periodic table is hydrogen and largest atom is caesium.
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Question 111 Mark
Name the second element of 5d series.
Answer
Second element of 5 d series is Hoffnium $\left(7^2\right)$.
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Question 121 Mark
What are inner transition elements?
Answer
f-block elements are known as inner transition elements and its outermost three shells are incomplete.
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Question 131 Mark
Which elements were not discovered at the time of Mendeleev's periodic table?
Answer
Ga and Ge (eka-aluminium and eka-silicon)
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Question 141 Mark
What are the elements which comes after Uranium are called?
Answer
Transuranic elements (parauranium elements) which starts from ${ }_{93} Np$.
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Question 171 Mark
How many inner transition elements are known?
Answer
Inner-transition elements are 28. (14 lanthanoids and 14 actinoids)
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Question 181 Mark
Element having electronic configuration $[ Ar ] 3 d^1 4 s^2$ is placed in which group?
Answer
In third group.
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