I'm not sure but i would say C.storing the heat energy.
Answer: 127.5ml
Explanation:
To calculate the volume of acid, we use the equation given by neutralization reaction:

where,
are the n-factor, molarity and volume of acid which is 
are the n-factor, molarity and volume of base which is KOH.
We are given:

Putting values in above equation, we get:

Thus 127.5 ml of 0.5M of HNO3 would be needed to react with 85ml of 0.75M of KOH
Answer:
The octet rule is a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
<u>Answer:</u> The temperature will be 1501.47 K.
<u>Explanation:</u>
To calculate the temperature of the gas when pressure is increased, we use the equation given by Gay-Lussac's Law.
This law states that pressure is directly proportional to the temperature of the gas at constant volume and number of moles.
Mathematically,

or,

where,
are the initial pressure and initial temperature of the gas.
are the final pressure and final temperature of the gas.
We are given:

Putting values in above equation, we get:

Hence, the temperature will be 1501.47 K
Physical Properties of Metals: Malleability and Ductility. The delocalised<span> electrons in the 'sea' of electrons in the metallic bond, enable the metal atoms to roll over each other when a stress is applied</span>