ICSE Class 9 Chemistry Covalent Bonding

• Please explain me the orbital diagram and electron Dot structure of ccl4, h2o, nh3,ch4 
• why does graphite have high melting or boiling point if their bonding is weak  
• give one property of hydrogen chloride which agrees with it being a covalent compound  
• A covalent hydrocarbon molecule having four single covalent bond   

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