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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When water freezes at 0°C its density decreases due to_______________?
When water freezes at 0°C its density decreases due to_______________?A. Change of bond angles
B. Cubic structure of ice
C. Empty space present in the structure of ice
D. Change of bond lengthThe IUPAC name of ethylene oxide is__________?
The IUPAC name of ethylene oxide is__________?A. Epoxy methane
B. Oxoethene
C. Methoxymethane
D. OxiraneThe common oxidation state of lanthanides is_________?
The common oxidation state of lanthanides is_________?A. +3
B. +2
C. +1
D. +4The process of aluminium extraction is called__________________?
The process of aluminium extraction is called__________________?A. Hall process
B. Thermite process
C. Haber process
D. Contact processA specie with maximum number of unpaired electrons ?
A specie with maximum number of unpaired electrons ?A. F
B. H2O
C. HF
D. NH-2Carbon in wrought iron is present as_________?
Carbon in wrought iron is present as_________?A. Silicon carbide
B. Iron carbide
C. Graphite
D. Partly as iron carbide and partly as graphite