Which of the following compounds contains a double bond? A - NH3 B - CO2 C - N2 D - CI2
1 answer:
Answer:- B)
Explanations:- In ammonia, N is the central atom and three H atoms are bonded to it via single bonds.
In carbon dioxide, the central atom is C and two O atoms are bonded to it via double bonds. The reason is, carbon has four valence electrons and oxygen has 6 valence electrons. To complete the octet, each oxygen makes a double bond with carbon. It looks as O=C=O .
Nitrogen has 5 valence electrons and to complete its octet, it needs 3 more electrons so both N atoms are bonded to each other via a triple bond.
Cl has 7 valence electrons and needs one more to complete its octet. So, there is a single bond between two Cl atoms.
Hence the right choice is B) .
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The number of 20-g ice cubes required to absorb 47 kJ from a glass of water upon melting is 7 icecubes
Why?
We are going to clear from the equation of the released heat, the mass of ice (m). The specific latent heat of fusion of ice is 336 kJ/kg:
So, 7 ice cubes are required to absorb that amount of heat from the glass of water.
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