What is the formula of Iron oxide
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Molecules with a plane of symmetry between the chiral centers are achiral and meso. From the given molecules (Picture attached) only (A) compound 1 is meso.
When compounds possess a plane of symmetry between the chiral centers they are called achiral or meso compounds. Among the given compounds (A) compound 1 have a plane of symmetry. So we can say compound one is a meso or achiral compound. Compounds two, three, and four have no plane of symmetry, as you can see in the structures attached. So all other compounds (compound 2, compound 3, and compound 4) except compound one are not meso or achiral.
You can also learn about meso compounds from the following question:
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To make a first step you have to know the balanced form for neutralization formula: 
According to this, you can <span>calculate what you are being asked :</span>
Then we have :
Hope everything is clear, here is the exact answer you need :
According to this, you can <span>calculate what you are being asked :</span>
Then we have :
Hope everything is clear, here is the exact answer you need :