Last seen: Oct 19, 2020
(b) Pauli’s exclusion principle Explanation: Quantum numbers of an atom can be defined on the basis of Pauli’s exclusion principle which states th...
(a) nitrogen Explanation: Electronic configuration corresponds to atomic number 7; hence the element is nitrogen.
(d) 1.094 x 106 ms-1 Explanation: According to Bohr, velocity (v) of an electron is given by relation. v = 2.188 x 106 Z/n m/s Here n = 2, and...
(d) 6.63 x 10-29 m Explanation: λ = h/mc = 6.6 x 10-34/10–6 x 10 = 6.63 x 10-29 m
(c) 0.3328 nm Explanation: We know that K.E = 1/2 mv2 2s.png = 0.3328 × 10-9 = 0.3328 nm
(d) H+ Explanation: Bohr's Theory is not applicable to H+ as it has no electron.
(a) ns2np5 Explanation: Most electronegative element corresponds to ns2np5 configuration.
(b) 1 proton, 1 neutron Explanation: Deuterium nucleus contains 1 proton and 1 neutron because it is an isotope of hydrogen.
(b) -5.447 x 10-12 erg atom-1 Explanation: For a particular element, En = 13.6Z2/n2 erg atom-1 ∴ En ∝ 1/n2 ∴ E1 /E2 = (n22)/(n1)2 or E2 = ...
(b) 9.1091 × 10-31 kg Explanation: e/m = 1.75875 x 1011 1.60206 x 10-19/m = 1.75875 x 1011 m = 1.60206 x 10-19/1.75875 x 1011 = 1.60206/1.75...
(d) 8.83 x 10-33 cm Explanation: From the de-Broglie formula for wavelength λ = h/p = h/mv = 6.6 x 10-34/150 x 50 = 8.83 x 10-33 cm
(c) 3800 Å – 7600 Å Explanation: Wavelength of visible light is 3800Å – 7600Å.
(a) electron with positive charge Explanation: Positron is electron with positive charge, +1e0
(a) n2 Explanation: The total no of orbital in a shell is n2.
(b) excited state of neon atom Explanation: Atomic number of the given element = 10 Electronic configuration = 1s2, 2s22p6 1s2, 2s22p6 is ele...
(c) If Assertion is correct but Reason is incorrect. Explanation: Equal moles of different substances contain same number of constituent particles...
(c) If Assertion is correct but Reason is incorrect. Explanation: Assertion is true, reason is false. Eq. wt. of H3PO3 = mol. wt/2 [∵ Basicity o...
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion. Explanation: Molality = No. of moles of sol...
(c) If the Assertion is correct but Reason is incorrect. Explanation: Yes, Eq. wt of a base = Molecular weight/Acidity Thus, assertion is correc...
(d) If both the Assertion and Reason are incorrect. Explanation: Atoms can be created and can be destroyed. At N.T.P., number of molecules or atom...