In HCN, the valence electron configuration of H = 1s¹
C = 2s²2p²
N = 2s²2p³
Thus, in HCN, C is the central atom which is bonded to H through a single bond and to N through a triple bond. In addition, there is a lone pair of electron on N atom. The 3 atoms lie in a straight line with a bond angle of 180⁰
Hence, the 3D shape of HCN is linear
Ans. B) Linear
Answer:
A
Explanation:
The entropy of a system has to deal with how energy is stored in a system. It tends to looks at the degree of disorderliness in the system.
The spontaneity of a reaction deals with the possibilities of the reactions occurring, while an exothermic reaction is one in which energy is released to the surroundings, the change in enthalpy here is negative.
The change in entropy or the change in enthalpy cannot dictate if a reaction is feasible I.e spontaneous or not. What determines the spontaneity of a chemical reaction is the change in free energy. For a reaction to be spontaneous, this value must be negative.
The change in free energy, the enthalpy and entropy are connected by the equation below:
ΔG = ΔH - TΔS
Now back to the question, for the first option, we were told that entropy increased and system is exothermic meaning negative enthalpy and positive entropy. In this case , change in free energy will be negative over all temperatures and hence, the reaction is spontaneous.
To the second option, we have negative entropy and negative enthalpy. Here change in free energy will only be negative at low temperature, which of course is not the best answer here
To the third option, we have negative entropy and positive enthalpy. This means change in free energy is only negative at high temperatures which of course is not the best answer.
Early stages of carbon monoxide poisoning is often confused with seasickness or intoxication.
This is so because some symptons of carbon monoxide (CO gas) poisoning are: irritated eyes, headache, nause, weakness and dizziness. As you can see those symptons are common to seasickness and intoxitation.
Carbon monoxide (CO gas) is colorless and odorless, so it may be difficult to detect the exposure to it before having some symptons of CO poisoning, but it is serious and can result in death. The victim shall be conducted to an open place promptly to receive fresh air and carried to a hospital to receive treatment urgently.