ECAT Chemistry Chapter 12 Periodic Classification of Elements and Periodicity With Answers

ECAT Chemistry Chapter 12 Periodic Classification of Elements and Periodicity

Sr. # Questions Answers Choice
1 There were seven groups in periodic table proposed by: Al-Razi Dobrierner Newland Mendeleev
2 First of all, idea of groups and periods was introduced by: Al-Razi Dobriener Newland Mendeleev
3 The periodic function of properties of elements is their atomic number Al-Razi Mosley Newland Mendeleev
4 Newland said, every eight element repeats properties of element: 1st 2nd 3rd 4th
5 Dobriener's was a scientist: Russian German English French
6 Newland's was scientist: Russian German English French
7 Mendeleev was a scientist: Russioan German English French
8 Periodic law was given by: Al-Razi Dobriener Newland Mendeleev
9 Law of octaves was given by: Al-Razi Dobriener Newland Mendeleev
10 Law of triads was given by: Al-Razi Dobriener Newland Mendeleev
11 Mosley gave his periodic law in the year: 1829 1864 1871 1913
12 Mendeleev gave his periodic law in the year: 1829 1864 1871 1913
13 Newland gave his law in the year: 1829 1864 1871 1913
14 Dobereiner gave his law in the year: 1829 1864 1871 1931
15 Scientist(s) made contributions in the field designing a periodic table Newland Dobriener Mendeleev & Mosley All of these
16 All facts of chemistry must be in simple logical patterns because chemistry is a subject: Simple Complex Un-understandable Easy
17 E.N. Value of fluorine is: 2.1 2.5 3.5 4.0
18 Alkali and alkaline earth metals are basic oxides except: Li Be Fr Ba
19 Hydrides are: Ionic Covalent Intermediate All above
20 Binary compounds of hydrogens are called: Halides Hydrides Oxides Nitrides
21 Hydration energy depends upon: Change of Ion Size of Ion Charge to size ratio Heat changes
22 Oxidation state of boron, aluminium and gallium is: +1 +2 +3 +5
23 Oxidation state of an element in free state is: Its numebr of elemtrons lost Its number of electrons gained zero Its number of electrons shared
24 Which group elements are the least metallic in nature? IV-A V-A VI-A VII-A
25 Electron affinity value from higher to heavier element: Increase Decreases remains same Not effect
26 Ionization energy of sodium is (Kj/mol) 503 523 513 524
27 Atomic radius changes from top to bottom in a group.: Increases Decreases Remains same Sometimes increases & Decreases
28 Properties of metal are: Malleable and ductile Form basic oxides Tamish in air All are true
29 Sodium belongs to block of periodic table: S-Block p- block d- block f- bloci
30 Period Number 6 contains elements in it: 2 8 18 32
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