Question

30. Which of the following molecules is polar? A) CC14 B) NH3 C) 503 D) CO2 E) BeF2 31. Rank the following elements in order of increasing atomic size: Ge, Rb, Ne, S A) Ge<RbNe <S B) Rb <S<Ne <Ge CS<Ne < Ge<Rb D) Ne<S<Ge<Rb E) Rb <Ge<Ne<S 32. Select the pair that has the larger atom or ion listed first. A) P, P3- B) Na+, Na C) S, 52- D) Mg2+, Mg E) Br, Kr 33. Which element has seven valence electrons ? A) Na B) AICS DIE) Ar 34. Which electron transition will give violet color? A) n=3 to n=2 B) n=4 to n=2 C) n=5 to n= 2 D ) n-6 to n=2 E) n=7 to n=2

Answer 1

30. Which of the following molecules is polar? A) CC14 B) NH3 C)503 D) CO2 E) BeF2 NH3 is unsymmetrical structure so polar in nature. 31. Rank the following elements in order of increasing atomic size: Ge, Rb, Ne, S size increase in periods left to right size A) Ge<Rb Ne <S B) Rb <S<Ne < Ge O.S.Ne <GeRb. D) Ne <S< Ge Rb : E) Rb <Ge<Ne<S in groups top to bottem decrease 32. Select the pair that has the larger atom or ion listed first. A) P, P3- B) Na+, Na C) S, S2- D) Mg2+, Mg E) Br”, Kr negative charge ions are bigger size, 33. Which element has seven valence electrons ? A) Na B) A CS DI E) Ar halogens having 7 valency electrons, 34. Which electron transition will give violet color? A) n=3 to n-2 B)n-4 to n=2 C) n=5 to n=2 D) n-6 to n-2 E) n=7 to n-2 n = 5 to n = 2 gives violet spectra.