What is the term for a bond in which a pair of electrons is shared equally? Sele
ID: 1010666 • Letter: W
Question
What is the term for a bond in which a pair of electrons is shared equally? Select one: polar bond electrovalent bond ionic bond coordinate covalent bond none of the above Draw the electron dot formula for the nitrate ion, NO_2^-. How many pairs of bonding electrons are in a nitrate ion? Select one: 3 2 6 4 none of the above what is the core nation for the electron configuration of a bromide ion? Select one: [Kr] [Ar] 4s^23d^104p^5 [Ar] [Xe] none of the above Which of the following changes decreases the pressure of a gas? Select one: increasing the temperature increasing the number of gas molecules decreasing the volume all of the above As the same temperature, which of the following gases contains molecules with the fastest average velocity? Select one: nitrogen, N_2 hydrogen, H_2 ozone, O_3 oxygen, O_2 The average velocity is the same.Explanation / Answer
1. When atoms having same electronegativity combine, there is sharing of eletrons between them leading to formation of so called non polar covalent bond. In ionic bond, there is loss of electrons by one atom, Electrovalane bond is same as ionic bond, In coordinate covalent compund, there is partial negative charge on more electronegative atom. Hence none of the answers given is correct. E is correct.
2. O= N- O-. There are three lone pair of electrons for bonding. Hence A is correct.
3. Bromide ion contains 36 electrons. Hence its electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 and notation is [Ar] 4s2 3d10 4p5 . B is correct.
4. From gas law PV= nRT
P= nRT/V
for pressure to decrease, V will have to increase, moles will have to decrease (O number of gas molecules )and also the temperatute. Hence none of the above is correct. E is correct.
5. The average velocity is = Sqrt(3RT/M)
where R= gas constant and M= Molecular weight and T is temperature in K
when the temperature remains constant , the gas having lower molecular weight will have higher mean speed. In the given chioces, H2 is having higher average speed. B is correct.
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