Periodic Properties

Periodic Properties

Which of the following sets contain only isoelectronic ions ?

Q: Which of the following sets contain only isoelectronic ions?

(A) Zn2+ , Ca2+, Ga3+, Al3+

(B) K+, Ca2+, Sc3+, Cl+

(C) p3- , S2- , Cl , K+

(D) Ti4+ , Ar , Cr6+ , V5+

Ans: (B) , (C)

Marks the correct statement out of the following

Q: Marks the correct statement out of the following :

(A) Helium has the highest first ionization enthalpy in the periodic table

(B) Fluorine has less negative electron gain enthalpy than chlorine

(C) In any period, atomic radius of the noble gas is the highest

(D) Hg and Br are liquids at room temperature

Ans: (A),(B),(C),(D)

Which of the following sequence contains atomic numbers of only representative elements

Q: Which of the following sequence contains atomic numbers of only representative elements

(A) 3, 33, 53, 87                                             

(B) 6, 14, 17, 38, 55

(C) 7, 17, 25, 37, 48                                       

(D) 9, 35, 54, 88

Ans: (A),(B),(D)

Which of the following processes do not involve absorption of energy ?

Q: Which of the following processes do not involve absorption of energy?

(A) S(g) + e   →  S  (g)

(B) O(g) +  e   → O2- (s)

(C) Cl (g) + e   → Cl (g)

(D) O (g) +  e   → O (g)

Ans: (A),(C),(D)

In which of the following pairs, both the species have nearly the same size ?

Q: In which of the following pairs, both the species have nearly the same size?

(A)   K+ , F

(B)Rb+ , O2-

(C) Li+ , Mg2+

(D) Mg2+ , Al3+

Ans: (A) , (B) & (C)