Last seen: Dec 29, 2021
Commensalism
Pacific salmon
Correct answer: (d) Na2CO3 Explanation: Na2CO3 does not decompose to form Na2O.
Correct answer: (b) NaNO3 forms Na2O2 on heating Explanation: NaNO3 Na2O2 + O2
Correct answer: (d) anionic part. Explanation: Zn2+ + 2NaOH → Zn(OH)2 + 2Na+ Zn(OH)2 + 2NaOH → Na2ZnO2 + 2H2O Na2ZnO2 → 2Na+ + (ZnO2)2-
Correct answer: (a) two sigma and two pi bonds Explanation: The structure of C34- ions is C-2 = C = C-2 i.e, 2σ 2π bonds.
Correct answer: (d) All of the above Explanation: All are facts.
Correct answer: (c) Eutectic mixture of CaCl2 /H2O freezes at -55°C while that of NaCl/H2O freezes at -18°C Explanation: Due to much lower freezin...
Correct answer: (c) -2 Explanation: , Let = 3 ⟹ ......(1) ∴ = = ∴ + = ∴ = = + + = -2
∆Tf = i Kf m Since all solutions have the same concentration, ∆Tf will depend only on i. i values are as follows: Ethanol = 1 Na2SO4 = 3 ...
Correct answer: (c) Dissociation enthalpy Explanation: Standard reduction electrode potentials of halogens are dependent on the parameters indicat...
Correct answer: (a) 3Ca3(PO4)2.Ca(OH)2 Explanation: Hydroxyapatite 3Ca3(PO4)2.Ca(OH)2 is the compound present in the enamel on the surface of the ...
Correct answer: (d) Both S1 and S2 are incorrect. Explanation: figure.png Limiting molar conductance for weak electrolyte may be greater than t...
Correct answer: (c) F2 is more reactive than ClF Explanation: In general, interhalogen are more reactive than halogens (except fluorine)
Correct answer: (b) (i) Conc. H2SO4, HNO3, (ii) CH3Cl + FeCl3 (iii) alkaline KMnO4 Explanation: figure.png
Correct answer: (d) ΔH < 0, ΔS < 0 Explanation: Adsorption is an exothermic process. In other words, ∆H of adsorption is always negative. Wh...