Which one of the following is 'd-block element?
Gd
Hs
Es
Cs
B.
Hs
The element in which last electron enters in d-orbital is called d-block element. The electronic configuration of the given elements are as follows:
Gd(64) = [Xe] 6s2, 4f7, 5d7
Hs(108) = [Rn] 7s2, 5f14, 6d6
Es(99) = [Rn] 7s2, 5f11
Cs(55) = [Xe] 6s1
Thus, Hs is d block element.
If the for a given reaction has a negative value then which of the following gives the correct relationships for the values of G° and Keq?
< 0; Keq > 1
<0; Keq < 1
> 0; Keq < 1
> 0; Keq > 1
Which of the following is an example for heterogeneous catalysis reaction?
2SO2(g) + O2 2SO3(g)
Hydrolysis of aqueous sucrose solution in the presence of a aqueous mineral acid
2H2O2 (l) 2H2O2(l) + O2(g)
Hydrolysis of liquid in the presence of aqueous mineral acid
The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
acyl chloride > acid anhydride > ester > amide
ester > acyl chloride > amide > acid anhydride
acid anhydride > amide > ester > acyl chloride
acyl chloride> ester> acid anhydride > amide
Clemmensen reduction of a ketone is carried out in the presence of which of the following?
Zn-Hg with HCl
LiAlH4
H2 and Pt as catalyst
Glycol with KOH
Which one of the following is employed as antihistamine?
Diphenyl hydramine
Norethindrone
Omeprazole
Chloramphenicol
In DNA, the complimentary bases are
adenine and thymine; guanine and cy1osine
adenine and thymine; guanine and uracil
adenine and guanine, thymine and cytosine
uracil and adenine; cytosine and guanine
Which one of the following does not undergo iodoform reaction?
Secondary butyl alcohol
Iso-propyl alcohol
Diethyl ketone
Ethyl alcohol
Which of the following compounds gives carbylamine test?
N-methyl-o-methyl aniline
N, N-dimethyl aniline
2, 4-diethyl aniline
p-methyl-N-methyl benzylamine