List of top Chemistry Questions

1 mol of an octahedral metal complex with formula $MCl_3 \cdot 2L$ on reaction with excess of $AgNO_3$ gives 1 mol of $AgCl$. The denticity of Ligand L is _________. (Integer answer)
In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment?
(i) [FeF$_6$]$^{3-}$ (ii) [Co(NH$_3$)$_6$]$^{3+}$ (iii) [NiCl$_4$]$^{2-}$ (iv) [Cu(NH$_3$)$_4$]$^{2+}$
The denticity of an organic ligand, biuret is :
The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO₄·5H₂O, respectively, are :
Spin only magnetic moment in BM of \( [\text{Fe(CO)}_4(\text{C}_2\text{O}_4)]^+ \) is :
Given below are two statements:
Statement I: The identification of Ni$^{2+}$ is carried out by dimethyl glyoxime in the presence of NH$_4$OH.
Statement II: The dimethyl glyoxime is a bidentate neutral ligand.
The ratio of number of water molecules in Mohr's salt and potash alum is _________ \(\times 10^{-1}\). (Integer answer)
The hybridization and magnetic nature of [Mn(CN)$_6$]$^{4-}$ and [Fe(CN)$_6$]$^{3-}$, respectively are :
3 moles of metal complex with formula Co(en)$_2$Cl$_3$ gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is ________. (Round off to the Nearest Integer).
Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula \(CrCl_3 \cdot 3NH_3 \cdot 3H_2O\) reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is ________.
The total number of unpaired electrons present in the complex K₃[Cr(oxalate)₃] is _________.
The calculated magnetic moments (spin only value) for species $[FeCl_4]^{2-}$, $[Co(C_2O_4)_3]^{3-}$ and $MnO_4^{2-}$ respectively are :
Given below are two statements :
Statement I : [Mn(CN)$_6$]$^{3-}$, [Fe(CN)$_6$]$^{3-}$ and [Co(C$_2$O$_4$)$_3$]$^{3-}$ are d$^2$sp$^3$ hybridised.
Statement II : [MnCl$_6$]$^{3-}$ and [FeF$_6$]$^{3-}$ are paramagnetic and have 4 and 5 unpaired electrons, respectively.
Choose the correct option.
Which one of the following species responds to an external magnetic field ?
_________ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) if the percentage yield is 64. (Round off to the Nearest Integer).

Which one of the following compounds is non-aromatic ? 

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethylbenzene from benzene is:

Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. \( \mathrm{H_2SO_4} \) followed by treatment with \( \mathrm{NaOH} \) ? 

Consider the above reaction, the major product "P" formed is : 

 

Given below are two statements :
Statement I : Hyperconjugation is a permanent effect.
Statement II : Hyperconjugation in ethyl cation \( (\mathrm{CH_3-CH_2^+}) \) involves the overlapping of \( \mathrm{C_{sp^2}-H_{1s}} \) bond with empty \( 2p \) orbital of the other carbon.
Choose the correct option :
Which one of the following set of elements can be detected using sodium fusion extract ?

Consider the above reaction and identify the Product P : 

The transformation occurring in Duma's method is given below:
$\text{C}_2 \text{H}_7 \text{N} + (2x + y/2) \text{CuO} \to x \text{CO}_2 + y/2 \text{H}_2\text{O} + z/2 \text{N}_2 + (2x + y/2) \text{Cu}$.
The value of $y$ is ________. (Integer answer)
The number of compound/s given below which contain/s —COOH group is ________ . (Integer answer)
(A) Sulphanilic acid (B) Picric acid (C) Aspirin (D) Ascorbic acid
Given below are two statements:
Statement I : Aniline is less basic than acetamide.
Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option :