List of top Chemistry Questions

Among $i-BuNH_2, NH_3, Me_2NH, EtNH_2,$ the number of compound(s) more basic than $MeNH_2$ is/are ______.
Among $K^+, Li^+, Rb^+, Cs^+$, the number of cation(s) having ionic radii more than $Na^+$ is/are _____.
Among the five fragments given below, <br> the number of fragment(s) accelerated to the analyzer tube in mass spectrometer with electron ionization is/are _________.
Among the five fragments given below, <br> the number of fragment(s) accelerated to the analyzer tube in mass spectrometer with electron ionization is/are _________.
A protein solution of 1 µM has transmission of 40 % at 280 nm, when measured in a 1 cm cuvette using a UV-Visible spectrophotometer. The transmission of the same solution, when measured using a 2 cm cuvette is ______ %. (rounded off to the nearest integer)
Consider a first order reaction 𝐴 → 𝐵. The initial concentration of 𝐴 is $100 mol L^{-1}$ and the value of first order rate constant is 0.01 $min^{-1}$. The concentration of 𝐴 after 10 min of reaction is ____ $ mol L^{-1}$ (rounded off to one decimal place).

Among [I3] + , [SiO4]4-, SO2Cl2, XeF2, SF4, ClF3, Ni(CO)4, XeO2F2, [PtCl4] 2−, XeF4, and SOCl2, the total number of species having sp3 hybridised central atom is ______.

Given below are two statements :
Statement I : The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga.
Statement II : The d orbitals in Ga are completely filled. In the light of the above statements,
choose the most appropriate answer from the options given below

600 mL of 0.01M HCl is mixed with 400 mL of 0.01 M H2SO4 .The pH of the mixture is ______ × 10-2 (Nearest integer) 
[Given log 2 =0.30 , log 3 =0.48 log 5 =0.69  log 7 -0.84 log 11 =1.04 ]

Match List I with List II
List I (Complex)List II (Hybridization)
A.Ni(CO)4I.sp3
B.[Cu(NH3)4]2+II.dsp2
C.[Fe(NH3)6]2+III.sp3d2
D.[Fe(H2O)6]2+IV.d2sp3
Choose the correct answer from the options given below:

The aromatic compound/species with maximum number of x - electrons is

Calculate standard Gibbs energy change at 25°C for the cell reaction \( \text{Cd(s)} + \text{Sn}^{2+}(\text{aq}) \to \text{Cd}^{2+}(\text{aq}) + \text{Sn(s)} \), \( E^\circ_{\text{Cd}} = -0.403 \, \text{V} \), \( E^\circ_{\text{Sn}} = -0.136 \, \text{V} \).

Convert the following: 
i. Ethyl alcohol into ethyl acetate 
ii. Phenol into benzene 
iii. Diethyl ether into ethyl chloride

Write Dow process for preparation of Phenol. 
What is the action of bromine water on phenol? 
Give reason: Group 16th elements have lower ionisation enthalpy compared to group 15th elements. 
Write two uses of dioxygen. 
 

Derive relationship between \( \Delta H \) and \( \Delta U \) for gaseous reaction. Define: Vulcanization. What is peptide bond?

Define: Diastereoisomers. Give cis and trans isomers of [Co(NH3)4Cl2]+.
What is reference electrode?
Give reason : Bleaching action of ozone is also called dry bleach. 

Silver crystallizes in fcc structure. If edge length of unit cell is 400 pm, calculate density of silver (Atomic mass of Ag = 108). Write a note on Haloform reaction.
Write chemical reactions for the following conversions:
i. Acetic acid into acetic anhydride
ii. Acetic acid into ethyl alcohol
Write IUPAC name and structure of methylphenylamine.
Explain Aldol condensation of ethanal.
Draw labelled diagram of H\(_2\) – O\(_2\) fuel cell. Write two applications of fuel cell.
Explain anomalous behaviour of oxygen in group 16 with respect to:
i. Atomicity
ii. Magnetic property
iii. Oxidation state
Explain formation of [CoF\(_6\)]\(^{3-}\) complex with respect to:
i. Hybridisation
ii. Magnetic properties
iii. Inner/outer complex
iv. Geometry
What is Pseudo first order reaction? Derive integrated rate law equation for zero order reaction.
Show that, time required for 99.9 percent completion of a first order reaction is three times the time required for 90 percent completion. Give electronic configuration of Gd (Z = 64). Write the name of nano structured material used in car tyres to increase the life of tyres.
Write the reactions for the formation of nylon 6,6 polymer.
Define Extensive property. Calculate the work done during the expansion of 2 moles of an ideal gas from 10 dm\(^3\) to 20 dm\(^3\) at 298 K in vacuum.