1)The state or phase in which most ionic compounds occur will be a solid state or phase. This will make the correct answer A.
2) The compound Co is an example of a covalent compound. This will make the answer to be D.
Answer:
After the concentration of H₂ is decreased
H₂+↑Br₂⇒↓2HBr
After the concentration of HBr is increased
↑H₂+↑Br₂⇒2HBr
Explanation:
After the concentration of H₂ is decreased, there will not be enough H₂ to from HBr, so the concentration of HBr will decrease, and the concentration of Br will increase.
After the concentration of HBr is increased, there would be more HBr that will give more H₂ and Br₂.
Answer: The correct answer is option B.
Explanation:
Average kinetic energy of the gas molecule is given by relation:
![E_K=\frac{3}{2}\frac{R}{N_A}\times T](https://tex.z-dn.net/?f=E_K%3D%5Cfrac%7B3%7D%7B2%7D%5Cfrac%7BR%7D%7BN_A%7D%5Ctimes%20T)
= Avogadro Number
T = Temperature of the gas in Kelvins.
R = Universal gas constant
![E_K\propto T](https://tex.z-dn.net/?f=E_K%5Cpropto%20T)
With increase in temperature the kinetic energy of the gas molecule increases and vice-versa.
So, according to the question the explanation for a drop in temperature of the gas is decrease in average kinetic energy of the gas molecules.
Hence, the correct answer is option B.