ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Which of the following discoveries resulted in a version of the Mendeleefs
periodic law
 The nucleus of atom by Rutherford The elements polonium and radium by the Curies Atomic numbers by Moseley x-rays by Roentgen
2 The hydration energy is the heat evolved when one mole of gaseous ion is dissolved in water. The hydration energy of an ion Increases with increase of charge to mass ratio Decreases with increase of charge to mass ratio Depends on sign of charge +ve or -ve Depends upon the solvent
3 Although hydrogen resemble with the elements of group lA, IVA and Vll but it is usually placed in Group IA Group IV A Group VII Group VIII
4 Which of the following is a member of -block Zn Al B Br
5 The fourteen elements following actinium are known as Lanthanones Lanthanides Rare earths Actinides
6 The fourth period contains elements 8 16 18 32
7 What is the nature of Al2O3 Acidic Basic Amphoteric Neutral
8 What is the nature of SO2 Basic Strongly acidic Weakly acidic Amphoteric
9 Na2O is Acidic Basic Neutral Amphoteric
10 A pair of elements in the same family in the periodic classification is Cl and C Ca and Al N and Ne Na and K
11 The elements of group lA are called Chalocogens Halogens Alkali metals Alkaline earth metals
12 The oxides of electronegative elements are Basic neutral Acidic Amphoteric
13 The coinage metals are Ni, Pd, Pt Cu, Ag, Au Zn, Al, Pb Fe, Si, Sn
14 In a period, melting points of elements Increases Decreases Remain constant First increases then decreases
15 Ionization energy depends upon Nuclear charge Atomic size Shielding effect All of the above
16 In a group, the ionization energy Increase Decreases Remain constant First increases then decreases
17 The amount of energy required to remove an electron from an atom of an element in the gaseous state is called Electron affinity Electronegatively Ionization energy None of these
18 Which is the transition element among the following B Al Cu Cs
19 In sixth period 14 of its transition elements are called Lanthanides Actinides Radioactive elements None
20 The correct order of 2nd l.P. of C,N,O and F is O > F > N > C O > N > F > C C > N > O > F F > O > N > C
21 Which is the longest period of the periodic table 5th 7th 6th 2nd
22 Which orbital is in the process of completion in case of transition elements p-orbital f-orbital d-orbital s-orbital
23 Number of elements in the first period of the periodic table are Two Four One Eight
24 The energy absorbed when an electron is added to a gaseous atom to form a gaseous ion is called Electron affinity Ionization energy Both of these None of these
25 The positive ion is always smaller than the neutral atom while the negative ion is always bigger than the neutral atom. The atomic and ionic radii of Na, F, Na+, F-are in ppm Na F Na<sup>+ </sup> F<sup>-</sup><div>157 72 95 136</div> Na F Na<sup>+</sup> F<sup>-</sup><div>157 95 172 136</div> Na F Na<sup>+</sup> F<sup>-</sup><div>72 95 136 157</div> Na F Na<sup>+</sup> F<sup>-</sup><div>157 136 95 72</div>
26 The electropositive elements from Acidic oxides Basic oxides Neutral oxides None
27 According to Mendleev, the physical and the chemical properties are the periodic function of their Atomic number Atomic mass Atomic wt None
28 Transition elements have valence electrons in s-orbital p-orbital d-orbital f-orbital
29 Rare earth elements are s-block elements p-block elements d-block elements f-block elements
30 The lA elements are called Alkaline earth metal Alkaline metals The halogens The inert gases
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