Answer:
c
Explanation:
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Answer: The charge on peptide chain lys-lys-his-glu at pH 7 is +1.
Explanation: A peptide chain is the chain formed from the condensation of two amino acids releasing 
molecule and forming N-terminal(Nitrogen- end) and C-terminal(Carboxyl-end). The bonds formed are known as peptide bonds.
Here 4 amino acids join together forming a peptide chain
In this peptide chain N-terminal is from lysine (lys) and C-terminal is from Glutamic acid (Glu).
At pH=7,
- The carboxyl (-COOH) groups will be deprotonated that means they will not have H-atoms and have (-1) charge.
- The Amino (
) groups will be protonated that means they have H-atoms and have (+1) charge.
So, there are 3 amino groups present each having (+1) charge and 2 carboxyl groups each having (-1) charge.
Total charge on peptide chain = 
= +1
Answer:
When zinc metal is reacted with hydrochloric acid, hydrogen gas is released and an aqueous solution of zinc chloride is produced. ... It is important that all of the zinc used be reacted and that large excess amounts of hydrochloric acid not be used.
Anhydrous zinc chloride is synthesized by treating zinc with hydrogen chloride. Whereas, hydrated and aqueous forms of zinc chloride are prepared by treating zinc with hydrochloric acid. Zinc metal could either be in the form of zinc sulfide or zinc oxide
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