The p-Block Elements questions
1863 published questions with worked solutions.
- A p-block element in which the last electron enters an s-orbital of the valence shell instead of a p-orbital is:
- The element which exists in both hard and soft allotropic forms is:
- Oxygen is divalent, but sulphur exhibits variable valency of 2, 4 and 6, because:
- Boron cannot form which one of the following anions?
- The element Z = 114 has been discovered recently. It will belong to which of the following family/group and electronic...
- If the atomic number of an element is 33, it will be placed in the periodic table in the:
- How many of the following oxides are basic in nature? Na_2O, CaO, Al_2O_3, SO_2, SiO_2
- In the periodic table, the element with atomic number 17 will be placed in the group ______.
- The atomic numbers of some elements are given below: 11, 15, 20, 27, 31, 35, 38, 48, 49, 52 From the above, the number of...
- Which gas cannot be kept in a glass bottle because it chemically reacts with glass?
- In view of the signs of _rG^ for the following reactions, PbO_2+Pb 2PbO, _rG^ <0; SnO_2+Sn 2SnO, _rG^ >0; Which oxidation states...
- C_ graphite +O_2(g) CO_2(g); H=-94.05 kcal mol^ -1 C_ diamond +O_2(g) CO_2(g); H is slightly more negative than for graphite...
- From the reaction, P(white) P(red); H=-18.4 kJ, it follows that
- The bond dissociation energy of B─F in BF_3 is 646 kJ ,mol^ -1 , whereas that of C─F in CF_4 is 515 kJ ,mol^ -1 . The correct...
- Which oxide of nitrogen is most stable?
- Which one is amphoteric oxide?
- Identify the correct order of acidic strength of CO₂, CuO, CaO, H₂O:
- Which oxide is/are neutral?
- If ClO₃⁻ is chlorate ion, then HClO₃ is:
- The acidic character order for given oxy-acids of halogens is:
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Alcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAlternating CurrentAminesAnatomy of Flowering PlantsAncient Indian HistoryAnimal KingdomApplication of DerivativesArea Under CurveAromatic Compounds and Aryl HalidesAtomsBasic Mathematics and LogarithmBinomial TheoremBiodiversity and ConservationBiological ClassificationBiomoleculesBiotechnology and Its ApplicationsBiotechnology: Principles and ProcessesBody Fluids and CirculationBreathing and Exchange of GasesCell Cycle and Cell DivisionCell: The Unit of LifeChemical Bonding and Molecular StructureChemical Coordination and Integration