Which of the following are allowed resonance forms of NCS^-? I [N = C - S:]- and

Question

Which of the following are allowed resonance forms of NCS^-? I [N = C - S:]- and [N = C - S:]^- II [N = C - S:]^- and [:N =C - S:]^- III (N = C - S:)- and [S - C = N:]^- A) only I B) only II C) only III D) I and III The number of sp2 hybrid orbitals on the carbon atom in CO_3^2- is A) one. B) two. C) three. D) four. At a constant pressure of 1.50 atm what is the enthalpy change Delta H for a reaction where the internal energy change Delta E is 58.0 kJ and the volume increase is 12.6 L? (1 L atm = 101.325 J.) A) 39.1 kJ B) 56.1 kJ C) 59.9kJ D) 76.9 kJ What is the sum of the coefficients when the following equation is balanced using the lowest whole-numbered coefficients? ___ PH_3(g) + ___ O_2(g) rightarrow __ P_4O_10(s) + ___ H_2O(g) A) 10 B) 12 C) 19 D) 22 What is the mass of 8.50 times 10^22 molecules of NH_3? A) 0.00830 g B) 0.417 g C) 2.40 g D) 120 g

Explanation / Answer

40.The allowed resonance forms is I,since nitrogen is more electronegative so it attracts the electrons towards itself.

Therefore option (A) is correct

41) When an atom undergoes sp2 hybridisation the number of hybrid orbitals formed are equal to the number of participated orbitals which is equal to 1 s orbital & 2 p orbitals so totally 3

Therefore option (C) is correct

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