Lithium metal reacts with nitrogen gas to form lithium nitride. Identify the bal

Question

Lithium metal reacts with nitrogen gas to form lithium nitride. Identify the balanced reaction that describes this process. A. Li + N LiN B. Li + N_2 LiN_2 C. 2Li + N_2 li_2N_2 D. 6Li + N_2 2Li_2N E. 2Li + N_2 2LiN 64. Which of the elements listed below is most likely to exhibit an expanded octet in its compounds? A. O, P B. S, P C. Na, K D. C, S E. N, S 65. The number of valence electron in the CIO_4 ion is. A. 14 B. 25 C. 31 D. 32 E. 34 66. A ground-state atom of iron has unpaired electrons and is. A. 0, diamagnetic B. 5, paramagnetic C. 6, diamagnetic D. 4, paramagnetic E. 3, paramagnetic 67. The bond angle found in the geometry of the BF_3 molecule is A. 120degree. B. 109.5degree. C. 180degree. D. 90degree. E. 120degree, and 90 68. Which of the following wavelengths of electromagnetic radiation has the highest energy? A. 450. nm B. 225 nm C. 3.50 times 10^-9 m D. 8.40 times 10^-7 m E. 2.50 times 10^-5 m 69. Which color have higher energy A. Blue B. Violet C. Ret D. Green E. Yellows 70. N, N-diethyl-m-tolumide (DEET) is the active ingredient in many mosqutio repellents. What is the hybridization state of nitrogen idicated by the arrow in the structure of DEET shown below? A) sp B) sp^2 C) sp^3 D) so^2d E) sp^3d^2 71. Which ground-state atom has an electron configuration described by the following orbital diagram? A) antimony B) germanium C) iodine D) lead E) tin 72. Identify the correct not ionic equation for the reaction that occurs when solutions of AgNO_3 and NH_4CI are mixed. A) AgNO_3(aq) + NH_4CI(aq)rightarrowAgCI(s) + NH_4CI(aq) B) NH_4^+(aq) + NO_3(aq) rightarrow NH_4NO_3(s) C) AgNO_3(aq) + NH_4CI(aq) rightarrow AgCI(s) + NH_4CI(s) D) Ag^+(aq) + CI^-(aq) rightarrow AgCI(s) E) AgNO_3(aa) + NH_4^+(aq) rightarrow NH_4AgNO_3(s)

Explanation / Answer

63) the reaction will be

6Li + N2 --> 2Li3N

64) Expanded octet is possible in elements with empy d orbitals

so answer is Phosphorous and sulphur

65) The valence electrons in Cl = 7

Valence electrons in O = 6

total valence electrons = 7 +6X4 = 31 + one electron as negative charge = 32 electrons (ans)

66) Ground state electronic configuration of Fe

[Ar] 4s23d6

so number of unpaired electrons = 4 , paramagentic

67) Bond angle in BF3 = 1200

68) The highest energy means lowest wavelength as

Energy = hc / wavelength

Ans : 3.5 X 10^-9 m

69) The high energy colour will have lowest wavelength and out of these the lowest wavelength will be of violet (VIBGYOR)

70 ) hybridisation of indicated nitrogen = sp3

71) As per the electronic configuration, atomic number = 53

So element is iodine

72) AgNO3(aq) + NH4Cl (aq) --> AgCl(s) + NH4Cl(aq)

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