Physical Chemistry
Some Basic Concepts of Chemistry
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveStructure of Atom
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveTrue of FalseGaseous State
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveTrue of FalseChemical Kinetics and Nuclear Chemistry
NumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveInorganic Chemistry
Periodic Table & Periodicity
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveTrue of FalseChemical Bonding & Molecular Structure
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveTrue of FalseOrganic Chemistry
Basics of Organic Chemistry
Fill in the BlanksNumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)SubjectiveAldehydes, Ketones and Carboxylic Acids
NumericalMCQ (Single Correct Answer)MCQ (Multiple Correct Answer)Chemistry in Everyday Life
MCQ (Single Correct Answer)1
JEE Advanced 2013 Paper 1 Offline
Numerical
+4
-0
The total number of lone-pairs of electrons in melamine is
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2
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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3
IIT-JEE 2012 Paper 1 Offline
Numerical
+3
-0
The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?
| Peptide | $${R_1}$$ | $${R_2}$$ |
|---|---|---|
| I | H | H |
| II | H | $$C{H_3}$$ |
| III | $$C{H_2}COOH$$ | H |
| IV | $$C{H_2}CON{H_2}$$ | $${(C{H_2})_4}N{H_2}$$ |
| V | $$C{H_2}CON{H_2}$$ | $$C{H_2}CON{H_2}$$ |
| VI | $${(C{H_2})_4}N{H_2}$$ | $${(C{H_2})_4}N{H_2}$$ |
| VII | $$C{H_2}COOH$$ | $$C{H_2}CON{H_2}$$ |
| VIII | $$C{H_2}OH$$ | $${(C{H_2})_4}N{H_2}$$ |
| IX | $${(C{H_2})_4}N{H_2}$$ | $$C{H_3}$$ |
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4
IIT-JEE 2011 Paper 1 Offline
Numerical
+3
-0
A decapeptide (mol. wt. 796) on complete hydrolysis gives glycine (mol. wt. 75), alanine and phenylalanine. Glycine contributes 47.0% to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is _________.
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