List of top Chemistry Questions

Which transition metal does not form ‘MO’ type oxide? (M = transition metal)
Among \([Co(CN)_4]^{4-}\), \([Co(CO)_3(NO)]\), \(XeF_4\), \([PCl_4]^+\), \([PdCl_4]^{2-}\), \([ICl_4]^-\), \([Cu(CN)_4]^{3-}\), and \(P_4\), the total number of species with tetrahedral geometry is:
If the longest wavelength of the spectral line of the Paschen series of \( \text{Li}^{2+} \) ion spectrum is \( x \) Å, then the longest wavelength (in Å) of the Lyman series of the hydrogen spectrum is:
Arrange the following compounds in increasing order of their boiling points:
  • \(\mathrm{C_2H_5OH}\) (Ethanol)
  • \(\mathrm{CH_3CHO}\) (Acetaldehyde)
  • \(\mathrm{CH_3CH_2CH_3}\) (Propane)
  • \(\mathrm{CH_3OCH_3}\) (Dimethyl ether)

14g of cyclopropane burnt completely in excess oxygen. The number of moles of water formed is:

A → P is a first order reaction. The following graph is obtained for this reaction. (x-axis = time; y-axis = conc. of A). The instantaneous rate of the reaction at point C is
first order reaction
Which of the following has the least electron gain enthalpy?
In the ground state of hydrogen atom, electron absorbs 1.5 times energy than the minimum energy \( (2.18 \times 10^{-18} J)\) to escape from the atom. The wavelength of the emitted electron (in m) is \((m_e = 9 \times 10^{-31} kg)\)
The gas which makes lime water milky is
Bond between two nitrogen atoms in Nitrogen molecule is
Aniline on direct nitration at 288 K gives 51% (A), 47% (B) and 2% (C). ‘B’ on diazotisation, followed by reaction with CuCN | KCN gives a compound X. The percentage of nitrogen in X is:
Ammonia is synthesized in the Haber process in the following reaction.
$𝑁_2 (𝑔) + 3𝐻_2 (𝑔) → 2𝑁𝐻_3(𝑔)$ 
The temperature above which the reaction becomes spontaneous is __________ 𝐾 (rounded off to one decimal place). 
($\bigtriangleup 𝐻^0 = −92.2 𝑘𝐽, \bigtriangleup 𝑆^0 = −199 𝐽𝐾^{ −1}$ )
A cylinder contains 50 𝐿 of an ideal gas at a pressure of 50 𝑎𝑡𝑚. Assuming that the temperature remains unchanged, the volume of the gas at 1 𝑎𝑡𝑚 is __________ 𝐿 (rounded off to the nearest integer).
Thermite welding is caused by the formation of which compound?
The de Broglie wavelength of an electron with kinetic energy of \( 2.5 \) eV is (in m): \[ (1 \text{ eV} = 1.6 \times 10^{-19} \text{ J}, \quad m_e = 9 \times 10^{-31} \text{ kg}) \]
Ionic character of the covalent bonds in the compounds Cl2, HCl, NaCl, NaF follows the order
Which of the following is adsorbent?
Which of the following is the correct melting point order of dichlorobenzene isomers?
What is the conjugate base of HSO$_4^-$?
Benzaldehyde reacts with conc. NaOH to give:
Chemical formula of Water-gas is:
Which of the following series in the spectrum of hydrogen atom lies in the visible region of the electromagnetic spectrum?
With excess bromine, phenol reacts to form
LiH, HClO$_4$, O$_3$, P$_4$ Oxidation states of the elements are respectively:
Which of the following correctly represents the order of basic strength among Group 15 hydrides?