Physical Chemistry
Some Basic Concepts of Chemistry
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveStructure of Atom
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NumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveInorganic Chemistry
Periodic Table & Periodicity
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Basics of Organic Chemistry
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NumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)Chemistry in Everyday Life
MCQ (Single Correct Answer)1
JEE Advanced 2020 Paper 2 Offline
Numerical
+3
-1
The structure of a peptide is given below.
If the absolute values of the net charge of the peptide at $\mathrm{pH}$ $=2$, $\mathrm{pH}=6$, and $\mathrm{pH}=11$ are $\left|Z_1\right|,\left|Z_2\right|$, and $\left|Z_3\right|$, respectively, then what is $\left|Z_1\right|+\left|Z_2\right|+\left|Z_3\right|$?
If the absolute values of the net charge of the peptide at $\mathrm{pH}$ $=2$, $\mathrm{pH}=6$, and $\mathrm{pH}=11$ are $\left|Z_1\right|,\left|Z_2\right|$, and $\left|Z_3\right|$, respectively, then what is $\left|Z_1\right|+\left|Z_2\right|+\left|Z_3\right|$?
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2
JEE Advanced 2014 Paper 1 Offline
Numerical
+3
-0
The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is
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3
JEE Advanced 2013 Paper 1 Offline
Numerical
+4
-0
The total number of lone-pairs of electrons in melamine is
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4
JEE Advanced 2013 Paper 1 Offline
Numerical
+3
-0
A tetrapeptide has $$-$$COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $$-$$NH2 group attached to a chiral center is _______.
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