Dear aspirants,
This is the new year with new goals, new experiences and lots of exams to be scheduled soon. SSC CGL has recently released the exam dates so now it is time to gear up your preparations and try hard to get success. ADDA247 never fails to deliver something new and fruitful for you all. This time also we are providing you the best study plan as well as a study material. We are here going to prepare your General Science section for the SSC CGL. In this article, we are providing you the details that how we are going to help you to clear the examination this year. We ADDA247 is going to provide you daily tests for all the subjects. The topic-wise quiz will be done from January till May. This will help you to get a deeper knowledge of all the topics and will prepare you thoroughly.
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Q1. The electron affinity of chlorine is highest than that of fluorine due to–
(a) Its highest reactivity
(b) Bigger size
(c) Difference in their electronic configuration
(d) Smaller nuclear charge
Q2. Electron affinity of noble gases is–
(a) Almost zero
(b) Low
(c) High
(d) Very high
Q3. Metal with maximum density here is-
(a) Fe
(b) Mo
(c) Hg
(d) Os
Q4. The calculation of electronegativities was first done by-
(a) Slater
(b) Pauling
(c) Bohr
(d) Mulliken
Q5. In the following four elements, the ionization potential of which one is the highest-
(a) Argon
(b) Barium
(c) Cesium
(d) Oxygen
Q6. The element having the lowest melting point in periodic table is-
(a) Hg
(b) He
(c) W
(d) Cs
Q7. First of all the elements were classified by–
(a) Lother Meyer
(b) Newland
(c) Mendeleev
(d) Dobereiner
Q8. The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all–
(a) Inert gas
(b) Light metals
(c) Halogens
(d) Rare earth metals
Q9. Which of the following among alkali metals is most reactive?
(a) Na
(b) K
(c) Rb
(d) Cs
Q10. The total number of lanthanide elements is–
(a) 8
(b) 32
(c) 14
(d) 10
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S1.Ans(b)
Sol. Fluorine, though higher than chlorine in the periodic table, has a very small atomic size. This makes the fluoride anion so formed unstable (highly reactive) due to a very high charge/mass ratio. As a result, fluorine has an electron affinity less than that of chlorine.
S2.Ans(a)
Sol. Noble Gases have complete valence electron shells.Most elements ‘want’ to have a complete electron shell with 8 electrons. Since the Noble Gases already have that ‘perfect status’ then they have an affinity of 0. Affinity is the change in energy of the atom when an electron is added.
S3.Ans(d)
Sol. The densest chemical element is osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead.
S4.Ans(b)
Sol. The most commonly used method of calculation is that originally proposed by Linus Pauling.
S5.Ans(a)
Sol. Argon is the highest ionization potential energy .
S6.Ans(b)
Sol.The chemical element with the lowest melting point is Helium.
S7.Ans(b)
Sol. An English scientist by the name of John Newlands tried to classify the elements in a unique manner. He first started by arranging all the elements in a ascending order according to their atomic weights.
S8.Ans(a)
Sol. The elements with atomic numbers 2, 10, 18, 36, 54 and 86 are all Inert gas.
S9.Ans(d)
Sol. Cesium and francium are the most reactive elements in this group. Alkali metals can explode if they are exposed to water.
S10.Ans(c)
Sol. The lanthanide series consists of the 14 elements, with atomic numbers 58 through 71,
In the last month i.e. in May daily we will provide you with a test of the previous years’ question papers, this will increase your confidence of solving the real exam and will make you familiar with the real-time exam.
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