Multiple Choice QuestionsCorrect order of electron affinities of halogens is
F> Cl> Br> I
I> Br> Cl> F
Cl> F>I>Br
Cl>F>Br>I
Atomic radii of Ti, Zr and Hf vary
Ti>Zr> Hf
Ti<Zr< Hf
Ti< Hf<Zr
Ti<Zr=HF
D.
Ti<Zr=HF
Ti, Zr and Hf belong to IV B group of Periodic Table and in a group atomic radii increases on moving down. However, the transition metals of 4d-series have nearly the same radii as metals of Sd-series.
Hence, the order of atomic radii is
Ti < Zr = Hf
Due to nearly equal atomic radii, Zr and Hf are called chemical twins.
If NO2(N2O4) is dissolved in NaOH, we get solution of
NaNO2
NaNO3
mixture of NaNO2 and NaNO3
NaNO4
Which of the following is strongest base?
Perkin's reaction
Knoevenagel reaction
Reformatsky reaction
Benzoin condensation
Which of the following will not respond to iodoform test?
Ethyl alcohol
Propanol-2
Propanol-1
Ethanal
Which of the following acids will have lowest value of pKa?
CH3CH2COOH
CH3CHBrCOOH
CH3CHFCOOH
FCH2CH2COOH
Which of the following does not contain chiral carbon atom?
Lactic acid
2-chlorobutanoic acid
Tartaric acid
Succinic acid
What will be the compound if two valencies of carbonyl group are satisfied by two alkyl groups?
Aldehyde
Ketone
Acid
Acidic anhydride
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