Last seen: Jan 13, 2022
(2) (A) – (IV), (B) – (I), (C) – (II), (D) – (III) Explanation: γ = 1 + 2/f For A ; f = 3 ; γ = 1 + 2/3 = 5/3 For B ; f = 5 ; γ = 1 + 2/5 = 7/...
(1) 61.7 Explanation: MSΔT = Mℓ 200/1000 x 4200 x 25 = m x 340 x 103 m = 61.7
(4) 7.2 × 10-2 J Explanation: τ = MBsinθ = 0.18 ω = ΔU = Ur -Ui = –MBcos180° – (–MBcos0°) = 2MB = 2 × 0.6 × 0.06 = 0.072 J
Number of mole of X = 6.022 x 1022/6.022 x 1023 = 10/Molar mass of X So molar mass of X = 100 g Molarity = 5/100 x 2 = 0.025 M = 0.025 M = 25 ...
Phosphinic acid is hypo phosphorous acid (H3PO2). NaOH + H3PO2 → NaH2PO2 + H2O For neutrization (N1V1)acid = (N2V2)base = 0.1 x 10 = 0.1 x (Vm...
(4) (I), (II) and (IV) Explanation: Charge / radius ratio of Be and Al is same because of diagonal relationship. Remaining statements are correct.
(2) [Cr(H2O)4Cl2]Cl.2H2O Explanation: Conc. H2SO4 acts as dehydrating agent. Molar mass of given complex = 266.5 g/mol. On treating with con...
(1) 1.7 and 0.5 Explanation: For H2O2 Molarity = Volume strength/11.2 = 5.6/11.2 = 0.5 M Molarity = % w/w x 10 x d/GMM %(w/w) = 0.5 x 34/10 ...
(3) 8 is the first noble gas Explanation: For n = 1 value of ℓ = 0, 1, 2 For n = 2 value of ℓ = 0, 1, 2, 3 So, according to n + l rule the fil...
(2) 3 Explanation: As difference in 3rd and 4th ionisation energies is high so atom contains 3 valence electrons.
(2) (c) and (d) Explanation: (B) It is harmful for trees and plants. (C) It causes breathing problem in human being and animals.
d = Z x M/Na x Volume 2.7 = Z x 27/6.02 x 1023[4.05 x 10-3]3 Z = 4 => fcc unit cell For fcc unit cell 4r = √2a r = 1.414 x 405/4 = 143.16...
Molarity of H2O2 solution = {Volume strength/11.2} Volume strength = 8.9 × 11.2 = 99.68 V
Let total mole of solution = 1 so mole of glucose = 0.1 mole of H2O = 0.9 % (w/w) of H2O = [0.9 x 18/0.9 x 18 + 0.1 x 180] x 100 = 47.368 = ...
Correct answer: (2) NO Explanation: Aqua regia is HNO3 : HCl 1 : 3 HNO3 + 3HCl → 2H2O + NO + 3[Cl] (i) Au + 3[Cl...
Correct answer: (4) cis-[CrCl2(ox)2]3- (ox = oxalate) Explanation: Only cis-[CrCl2(ox)2]3- show optical isomerism while its trans form do not show...
Correct answer: (3) NO–1 Explanation: Species Bond order (1) NO+ 3 (2) NO2+ 2.5 (3) NO– 2 (4) NO ...
Correct answer: (3) less than 300 K Explanation: At room temperature water is liquid and has boiling point 373 K due to hydrogen bonding. Where as...
Correct answer: (4) Distillation under reduced pressure Explanation: Glycerol can be separated from spent-lye in soap industry by using Reduce pre...
Correct answer: (4) Br2 / water, ZnCl2 / HCl ; FeCl3