Chemistry Test 18

Result

Chemistry Test 18

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

Which one of the following groupings represents a collection of isoelectronic species?
(At. Numbes : Cs-55, Br-35)

A
Na⁺, Ca²⁺, Mg²⁺

B
N^3–, F^–, Na⁺

C
Be, Al³⁺, Cl^–

D
Ca²⁺, Cs⁺, Br

Solution

N^3– 7 + 3 = 10 electrons
F^– 9 + 1 = 10 electrons
Na⁺ 11 – 1 = 10 electrons
Question 2
4 / -1

Glass is a:

A
micro-crystalline solid

B
super-cooled liquid

C
gel

D
polymeric mixture

Solution

Glass is a supercooled liquid, which forms a non-crystalline solid. The common lime-soda glass used for bottles and jars is a uspercooled mixtrue of sodium and calcium silicates.
Question 3
4 / -1

The oxidation state of Cr in [Cr(NH₃)₄Cl₂]⁺ is

A
+3

B
+2

C
+1

D
0

Solution

(Cr(NH₃)₄Cl₂)⁺
X + 4 × 0 + 2 × - 1 = 1
X = +3