ECAT Chemistry Chapter 16 The Halogens and The Noble Gases Online Test With Answers

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ECAT Chemistry Chapter 16 The Halogens and The Noble Gases Online Test

Sr. # Questions Answers Choice
1 Second most element in the universe is He Ne Ar Kr
2 Which is present as a result of radioactive decay on earth? He Ne Ar Kr
3 Noble gases in the atmosphere are 4% 3% 2% 1%
4 The noble gases are Mono atomio Diatomic Polyatomic All
5 Used in tooth pastes is Fluorides Iodides halides nitrides
6 Non sticking coating in cooking utensils is done by Iron Cooper Plastic Teflon
7 Corrosion proof parts of machinery are prepared from Iron Copper Plastic Teflon
8 The available chlorine is bleaching power is 25-30% 30-35% 35-40% 40-45%
9 Bleaching powder is agent: Dehydrating Oxidazing reducing all
10 Bleaching powder is prepared by the reaction of Cl2 with. Lime stone Lime water slaked lime Lime
11 Perchloric acid can be stored in solution form 47% 57% 67% 77%
12 The strongest acid is HF HCl HBr HI
13 The compound with cyclic hexamer is HF HCl HBr HI
14 The strongest hydrogen bond is in HF HCl HBr Hl
15 Which is volatile liquid? HF HCl HBr Hl
16 A property which differs fluorine from the other halogens? Direct combination with inert gases Uninegative Diatomic ns<sup>2</sup> , np<sup>5</sup>
17 Half life of most stable isotope of astatine is 8.0 hrs 8.1 hrs 8.2 hrs 8.3 hrs
18 Colour of Iodine is Pale yellow Greenish yellow Red brown Greyish black
19 Colour of bromine is Pale yellow Greenish yellow Red brown Greyish black
20 Colour of chlorine is Pale yellow Greenish yellow Red brown Greyish black
21 Colour of fluorine gas is Pale yellow Greenish yellow Red brown greyish black
22 Molecule of halogens exist as Monatomic Diatomic Triatomi Polyatomic
23 Radioactive element in halogens is Astatine bromine Iodine Fluorine
24 Halogens are called. salt former Light bearing copper forming None of these
25 Nobel gases are placed group: Group IV-A Group V-A Group VI-A Group VII-A
26 Gaseous HF exists in the form of Monomers Cyclic hexames As single entity Both (a) and (b)
27 Oxidation state of fluorine is: +1 +2 -1 -2
28 Smell of halogens is: Fruity Sweet Irritating Rotten egg
29 The most reactive elements are: Group IV-A Group V-A Group VI-A Group VII -A
30 Astatine belongs to group: I-A II-A III-A VII-A
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