Which one of the following has polar covalent bond ?
Which one of the following has polar covalent bond ?
A. HF
B. CH4
C. H2
D. N2
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Which one of the following species is not an electrophile ?
Which one of the following species is not an electrophile ?A. NH3
B. Br+
C. H+
D. BF3What are the metal bearing rocks called?
What are the metal bearing rocks called?A. Bitumen
B. Bauxite
C. Metalloids
D. OresThe most reactive allotropic form of phosphorus is________________?
The most reactive allotropic form of phosphorus is________________?A. White
B. Redox potential
C. Black
D. VioletIn the production of wrought iron Mg Si and P are removed in the form of___________________?
In the production of wrought iron Mg Si and P are removed in the form of___________________?A. oxides
B. silicates
C. slag
D. carbonatesWhich discovery caused a revision in the periodic law as stated by Mendeleev ?
Which discovery caused a revision in the periodic law as stated by Mendeleev ?A. Location of nucleus by Rutherford
B. Atomic number by Moseley
C. X-rays by Roentgen
D. Natural radioactivity by Henry Bacquerel.Carbon,Diamond and Graphite are together called:___________?
Carbon,Diamond and Graphite are together called:___________?A. Allotrope
B. Isomers
C. Isomorphs
D. IsotopesThe term allotrope refers to one or more forms of a chemical element that occur in the same physical state. … Allotropes may display very different chemical and physical properties. For example, graphite and diamond are both allotropes of carbon that occur in the solid state