The reason for small radius of Ga compared to Al is_________ .(a) poor screening effect of d and f orbitals(b) increase in nuclear charge(c) presence of higher orbitals(d) higher atomic number

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Learn Chemistry +1 Unit 11-Some p -Block Elements

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Keshav Goyal

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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, Cl3+, V5+
Answe is c All ions have 18 e each
Selvi
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Among halogens, the correct order of amount of energy released in electron gain (electron gain enthalpy) is
(a) F > Cl > Br > I
(b) F < Cl < Br < I
(c) F < Cl > Br > I
(d) F < Cl < Br > I
Answer is C as due to interelectronic repusion and small size F has less negative electron gain enthalpy than Cl
Jagabandhu
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In which of the following substances will hydrogen bond be strongest?
(a) HCl
(b) H20                     
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(d) H2S
B. H2O
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What's the home monthly tuition fees for classes 12th Chemistry in Vadodara?
For one subject Rs. 500 per class.
Shalini
Can I pass class 11 and 12 with good marks without any coaching?
we live in a world where digital technology has outweighed conventional way of teaching.One can easily score good marks in class 11 and 12 without coaching. Some of the best online learning portals are Khan Academy, Youtube, ask iitians, Quora etccc
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