List of top Chemistry Questions

Which one of the following reactions does not occur during extraction of copper?

In the following halogenated organic compounds the one with maximum number of chlorine atoms in its structure is :

A cubic solid is made up of two elements $X$ and $Y$ Atoms of $X$ are present on every alternate corner and one at the center of cube $Y$ is at $\frac{1}{3} rd$ of the total faces. The empirical formula of the compound is

Match items of Row I with those of Row II

Which one of the following statements is correct for electrolysis of brine solution?

Which of the following is not ambidentate ligand

If the CFSE of $\left[ Ti \left( H _2 O \right)_6\right]^{3+}$ is $-960 kJ / mol$, this complex will absorb maximum at wavelength ___$nm$ (nearest integer) Assume Planck's constant $( h )=64 \times 10^{-34} Js$, Speed of light $( c )=30 \times 10^8 m / s$ and Avogadro's Constant $\left( N _{ A }\right)=6 \times 10^{23} / mol$

Arrange the following elements in increasing order of their electronegativity according to the Pauling scale
C, Na, Be and Br

Match the molecules in Group I with the type of bonds present in them, in Group II

Group I	Group II
P) NaCl	1) Coordination bond
Q) $H_2$	2) Polar covalent bond
R) $Pd-P$ bond in $Pd(PPh_3)_4	3) Covalent bond
S) $C-Cl$ bond in $CH_3Cl $	4) Ionic bond

What is the splitting pattern of proton $H^{a}$ of the following compound in its $^1H NMR$ spectrum?

Which of the following compound(s) is/are aromatic?

Which of the following statement(s) is/are correct for the following compound?

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 _________.

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, [PtCl_4]²⁻, XeF₄, and SOCl₂, the total number of species having sp³ hybridised central atom is ______.

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)₄	I.	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.

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.