List of top Chemistry Questions

The molecules A and B are a pair of ": 
 

The CORRECT order of acidity of the following compounds is: 
 

Among the following, the structure representing histidine is:
Which one of the following is the CORRECT representation of the variation of the Gibbs free energy (( G )) of a substance with temperature (( T )) at constant pressure?
The CORRECT order of electronegativity is:
Match List I with List II
List-IList-II
A. Melting point [K]I. Tl > In > Ga > Al > B
B. Ionic Radius [M3/pm]II. B > Tl > Al β‰ˆ Ga β‰ˆ In
C. Ξ”iH1 [kJ mol-1]III. Tl > In > Al > Ga > B
D. Atomic Radius [pm]IV. B > Al > Tl > In > Ga

Choose the correct answer from the options given below:
A newly identified viral protein contains one long a-helix spanning 60 amino acid residues. The number of main chain H-bonds formed in this helix is____ (Answer in integer)
One molecule of the protein myoglobin contains one atom of iron. A myoglobin sample was found to contain 0.34% iron. The molecular weight of myoglobin is _________ $𝑔 π‘šπ‘œπ‘™^{βˆ’1}$ (rounded off to the nearest integer).
(Use $55.9 𝑔 π‘šπ‘œπ‘™^{βˆ’1}$ as atomic mass of iron)
Consider the following reaction:\[3\text{PbCl}_2 + 2(\text{NH}_4)_3\text{PO}_4 \rightarrow \text{Pb}_3(\text{PO}_4)_2 + 6\text{NH}_4\text{Cl}\]If 72 mmol of PbCl\(_2\) is mixed with 50 mmol of (\(\text{NH}_4\))\(_3\)PO\(_4\), then the amount of \(\text{Pb}_3(\text{PO}_4)_2\) formed is ______ mmol (nearest integer).
The number of peaks in the $^{1}H NMR$ spectrum of methoxymethane $(𝐢𝐻_3𝑂𝐢𝐻_3)$ is ________ .
What is the structural feature of glucose that makes it a reducing sugar?
In the lewis dot structure for \(NO^{-}_{2}\), total number of valence electrons around nitrogen is .......
The amount of agarose required to prepare 250 π‘šπΏ of 0.8% agarose gel is _______ π‘”π‘Ÿπ‘Žπ‘šπ‘  (rounded off to the nearest integer).
Match the metabolic intermediates listed in Column I with their corresponding amino acids given in Column II.
Column IColumn II 
P. a-Ketoglutarate i. Histidine 
Q.Ribose 5-phosphate ii. Glutamate
R. 3-Phosphoglycerate iii.Aspartate
S. Phosphoenolpyruvateiv. Phenylalanine
 v.Serine
In a borax bead test under hot condition, a metal salt (one from the given) is heated at point B of the flame, resulted in green colour salt bead. The spin-only magnetic moment value of the salt is ............. BM (Nearest integer)
[Given atomic number of Cu = 29, Ni = 28,Mn = 25, Fe = 26]
Given below are two statements :
Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements.
Statement II : Copper can not liberate hydrogen from weak acids.
In the light of the above statements, choose the correct answer from the options given below
The metals that are employed in the battery industries are
A. Fe 
B. Mn 
C. Ni 
D. Cr 
E. Cd 
Choose the correct answer from the options given below:
A wooden plant accumulates $10 π‘šπ‘” π‘˜π‘”^{βˆ’1}$ of $^{14}C$ during its life span. A fossil of this plant was discovered and contains $2.5 π‘šπ‘” π‘˜π‘”^{βˆ’1}$ of $^{14}C$. The age of this fossil at the time of discovery is years (rounded off to the nearest integer).
(Use 5730 years as half-life of $^{14}C$)
In the following reaction sequence, the major product \(Q\) is:
Vessel-1 contains \(w_2\) g of a non-volatile solute \(X\) dissolved in \(w_1\) g of water. Vessel-2 contains \(w_2\) g of another non-volatile solute \(Y\) dissolved in \(w_1\) g of water. Both the vessels are at the same temperature and pressure. The molar mass of \(X\) is 80\% of that of \(Y\). The van’t Hoff factor for \(X\) is 1.2 times that of \(Y\) for their respective concentrations. The elevation of boiling point for solution in Vessel-1 is \_\_\_\_\_ \% of the solution in Vessel-2.
To form a complete monolayer of acetic acid on 1 g of charcoal, 100 mL of 0.5 M acetic acid was used. Some of the acetic acid remained unadsorbed. To neutralize the unadsorbed acetic acid, 40 mL of 1 M NaOH solution was required. If each molecule of acetic acid occupies \(P \times 10^{-23} \, m^2\) surface area on charcoal, the value of \(P\) is \_\_\_\_\_. \text{[Use given data: Surface area of charcoal} = 1.5 \times 10^{2} \text{ m}^{2}\text{g}^{-1}; \text{Avogadro's number (N}_{\text{A}}) = 6.0 \times 10^{23} \text{mol}^{-1}]
The option(s) with the correct sequence of reagents for the conversion of P to Q is (are):
The species formed on fluorination of phosphorus pentachloride in a polar organic solvent are:
According to Bohr's model, the highest kinetic energy is associated with the electron in the:
The compound(s) having peroxide linkage is (are):