Q). The Ionization energy of Beryllium is more than that of Boron, because Beryllium has…..
A) more nuclear charge
B) less screening effect
C) more penetration power of ‘2s’ than ‘2p’
D) more atomic radius
Q). The element with highest electronegativity among the following is
A) ‘O’
B) ‘N’
C) ‘C’
D) ‘B’
Q). Which of the following is smallest size cation?
A) Na+
B) K+
C) Mg2+
D) Al3+
Q). In a Dobereiner’s triad, the atomic weight of first and third elements are ‘7’ and ’39’ respectively. What is the atomic weight of middle element?
A) 14
B) 20
C) 23
D) 46
Q). Which of the following is called as ‘electron deficient molecule?
A) BF3
B) CH4
C) H2O
D) NH3
Q). Covalent bond is absent in
A) H2O
B) HCl
C) Na2O
D) NH3
Q). Which of the following Anions has Ne configuration?
A) Cl–
B) O2-
C) P3-
D) Br–
Q). The bond angle in BeCl2 molecule is
A) 109°28′
B) 120°
C) 180°
D) 104°31’
Q). An example for polar covalent bond is
A) H-H
B) H-Cl
C) Cl-Cl
D) F-F
Q). Which one of the following is correct statement in case of covalent compounds?
A) These are crystalline solids
B) These are soluble in non-polar solvents
C) Their reactions are very fast
D) They have high m.p. and b.p.