An element with atomic number 21 is a transition element

133.    An element with atomic number 21 is a

(A) halogen

(B) representative element

(C) transition element

(D) alkali metal

Answer:: (C)

134.    The sp3d2 hybridization of central atom of a molecule would lead to

(A) square planar geometry

(B) Tetrahedral geometry

(C) Trigonal bipyramidal geometry

(D) Octahedral geometry

Answer:: (D)

135.    The reagent with which both acetaldehyde and acetone react is

(A) I2/NaOH

(B) Fehling's reaction

(C) Carbonic acid

(D) Tollen's reagent

Answer:: (A)

136.    The ozone layer forms naturally by

(A) the interaction of CFC with oxygen

(B) the interaction of UV radiation with oxygen

(C) the interaction of IR radiation with oxygen

(D) the interaction of oxygen and water vapour

Answer:: (B)

137.    The number of naturally occurring p-block elements that are diamagnetic is ______.

(A) 6

(B) 18

(C) 7

(D) 5

Answer:: (D)

138.    The normality of 30 volume H2O2 is

(A) 2.678 N

(B) 5.336 N

(C) 8.034 N

(D) 6.685 N

Answer:: (B)

139.    An ionic compound is expected to have tetrahedral structure if  lies in the range of

(A) 0.414 to 0.732

(B) 0.225 to 0.414

(C) 0.155 to 0.225

(D) 0.732 to 1

Answer:: (B)