Last seen: Oct 19, 2020
(d) It decreases with an increase in atomic radii Explanation: The ionisation potential decreases with increase in atomic radii.
(d) P(0) Explanation: Electronic configuration of Cr (I) is 1s2 2s2 2p6 3s2 3p6 3d5. Electronic configuration of Fe(III) is 1s2 2s2 2p6 3...
(d) low value of Ist I.E. and high value of IInd I.E Explanation: Na (Z = 11; 1s2, 2s22p6 , 3s1) readily gives one electron because the resulting ...
(a) Li +> Na +> K + > Rb + Explanation: Hydration energy ∝ 1/size In a group, size increases on going down the group from top to bottom...
(d) 38 Explanation: Elements having 1, 2 or 3 electrons in its last shell act as metals. 32 = [Ar] 3d10 4s2 p2 34 = [Ar] 3 d10 4s2p4 36 = [A...
(c) VIIA Explanation: Group IA and III A contain mostly metals. Group VIII contains transition elements which are metals. Group VII A contains mos...
(b) Cl Explanation: Cl has high electron affinity.
(d) Hydrogen Explanation: First ionisation potential is maximum for hydrogen, as electron is withdrawn from the first orbital which is very near t...
(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion. Explanation: Radius, rn = n2 h2/4πe2mZ = n2 /Z ...
(c) If Assertion is correct but Reason is incorrect.
(c) If Assertion is correct but Reason is incorrect. Explanation: Plus and minus signs of spin quantum numbers imply that spin angular momentum of...
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(d) If both the Assertion and Reason are incorrect. Explanation: The orbital has dumb-bell shape and belongs to p-subshell.
(d) If both the Assertion and Reason are incorrect. Explanation: In this case both assertion and reason are false. Both 2px and 2py orbitals have ...
(d) If both the Assertion and Reason are incorrect. Explanation: Binding energy depends on the mass defect (mass lost when the constituent protons...
(d) If both the Assertion and Reason are incorrect. Explanation: Absorption spectrum consists of dark lines separated by bright space and emission...
(c) If the Assertion is correct but Reason is incorrect. Explanation: The value of n for a line in Balmer series of hydrogen spectrum having the h...
(d) If both the Assertion and Reason are incorrect. Explanation: Atoms are electrically neutral as number of electrons and protons are same.
(d) If both the Assertion and Reason are incorrect. Explanation: Energy of a photon = hv = h. c/λ. So, energy depends upon wavelength.