List of top Chemistry Questions

The IUPAC nomenclature of an element with electronic configuration $[ Rn ] 5 f ^{14} 6 d ^1 7 s ^2$ is :
$20 \,mL$ of $01 \,M \,NH _4 OH$ is mixed with $40\, mL$ of $005\, M \,HCl$ The $pH$ of the mixture is nearest to: (Given: $K _{ b }\left( NH _4 OH \right)=1 \times 10^{-5}, \log 2=030$, $\log 3=048, \log 5=069, \log 7=084$, $\log 11=104$ )
The depression in freezing point observed for a formic acid solution of concentration $05\, mL\, L ^{-1}$ is $00405^{\circ} C$ Density of formic acid is $105 \, g \, mL ^{-1}$ The Van't Hoff factor of the formic acid solution is nearly : (Given for water $k _{ f }=186 \, K \, kg \, mol ^{-1}$ )
Which of the following sets of quantum numbers is not allowed?
The reaction of $H _2 O _2$ with potassium permanganate in acidic medium leads to the formation of mainly:
1g of a carbonate (M2CO3) on treatment with excess HCl produces 0.01 mol of CO2 .The molar mass of M2CO3 is g mol-1. (Nearest integer)
The orbital angular momentum of an electron in 3s orbital is  \(\frac{xh}{2π}\) The value of x is___.
20 mL of 0.1 M NaOH is added to 50 mL of 0.1 M acetic acid solution. The pH of the resulting solution is____ x 10-2 (Nearest integer) 
Given: pKa (CH3COOH) = 4.76 
log 2 = 0.30 
log 3 = 0.48
At 298 K, the standard reduction potential for Cu2+/Cu electrode is 0.34 V. 
Given: Ksp Cu(OH)2 = 1 × 10-20 
Take \(\frac{2.303RT}{F}\)= 0.059V 
The reduction potential at pH = 14 for the above couple is (-)x x 10-2 V. 
The value of x is_____.
A(g) → 2B(g) + C(g) is a first order reaction. The initial pressure of the system was found to be 800 mm Hg which increased to 1600 mm Hg after 10 min. The total pressure of the system after 30 min will be ___mm Hg. (Nearest integer)
0.400 g of an organic compound (X) gave 0.376 g of AgBr in Carius method for estimation of bromine. % of bromine in the compound (X) is____
(Given: Molar mass AgBr=188g mol-1)

Water decomposes at 2300 K:
\[2\text{H}_2\text{O}(g) \rightleftharpoons 2\text{H}_2(g) + \text{O}_2(g).\]
The percent of water decomposing at 2300 K and 1 bar is — (Nearest integer).
Equilibrium constant for the reaction is \(2 \times 10^{-3}\) at 2300 K.

Millimoles of calcium hydroxide required to produce 100 mL of the aqueous solution of pH 12 is \(x \times 10^{-1}\). The value of \(x\) is — (Nearest integer).

Consider the following reaction approaching equilibrium at \(27^\circ \text{C}\) and 1 atm pressure:
\[\text{A + B} \rightleftharpoons \text{C + D}\]
\[K_f = 10^3, \quad K_r = 10^2\]
The standard Gibbs energy change (\(\Delta_r G^\circ\)) at \(27^\circ \text{C}\) is — kJ mol\(^{-1}\) (Nearest integer).

The correct IUPAC nomenclature for the following compound is.
2 Methyl 5 oxohexanoic acid
The number of species from the following which have square pyramidal structure is___
\(PF_5, BrF^− _4 4 − , IF_5\) ; \(BrF_5, XeOF_4, ICl ^−_ 4\)
$28.0\, L$ of $CO _2$ is produced on complete combustion of $168 \, L$ gaseous mixture of ethene and methane at $25^{\circ} C$ and $1 \, atm$ Heat evolved during the combustion process is ______$kJ$ Given : $\Delta H _{ c }\left( CH _4\right)=-900 \, kJ\, mol ^{-1}$ $\Delta H _{ c }\left( C _2 H _4\right)=-1400\, kJ \, mol ^{-1}$
See the following chemical reaction: \[ \text{Cr}_2\text{O}_7^{2-} + \text{XH}^+ + \text{6Fe}^{2+} \rightarrow \text{YCr}^{3+} + \text{6Fe}^{3+} + \text{ZH}_2\text{O}. \] The sum of \(X\), \(Y\), and \(Z\) is _____.
Formation of which complex, among the following, is not a confirmatory test of Pb2+ ions
Which of the following complex has a possibility to exist as meridional isomer?
L-isomer of tetrose X (\(C_4H_8O_4\)) gives positive Schiff’s test and has two chiral carbons. On acetylation, ‘X’ yields triacetate. ‘X’ undergoes following reactions
L-isomer of tetrose
Chiral compound ‘X’ is
Match list I with list II:

List I

List II

AKIThermonuclear reactions
BKClIIFertilizer
CKOHIIISodium potassium pump
DLiIVAbsorbent of CO2

Choose the correct answer from the options given below:
For compound having the formula GaCl\(_3\), the correct option from the following is:
Thin layer chromatography of a mixture shows the following observation:
Thin layer chromatography

The correct order of elution in the silica gel column chromatography is .
When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ferric ion was formed when treated with ferric chloride. It gave deep red colour which disappeared on boiling and a brown red ppt was formed. The mixture contains: