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The atomic numbers of Cr and Fe are respectively 24 and 26. Among the following, the one that is paramagnetic with the spin of the electron is:
The mass of $CO_2$ produced by heating 20 g of 20% pure limestone, as per the equation given below, is: $$ CaCO_3(s) \xrightarrow{\text{heat}} CaO(s) + CO_2(g) $$
$6.02 \times 10^{20}$ molecules of urea are present in $100 \text{ mL}$ of its solution. The concentration of the solution is:
$BF_3$ is a planar and an electron-deficient compound. Hybridisation and the number of electrons around the central atom, respectively, are:
Identify the incorrect statement among the following options:
Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them.
The bond order of 1.5 is shown by:
Match the molecules in List-I with the corresponding shape in List-II: List-I (Molecules): (a) $NH_3$ (b) $ClF_3$ (c) $PCl_5$ (d) $BrF_5$ List-II (Shape): (i) Square pyramidal (ii) Trigonal bipyramidal (iii) Trigonal pyramidal (iv) T-shape Choose the correct answer from the options given below:
In $NO_{3}^{-}$ ion, the number of bond pair and lone pair of electrons on nitrogen atom are respectively:
The total number of electrons present in $1.6\text{ g}$ of methane is:
Which of the following compounds has a higher hydration energy than the lattice energy?
The electronegativity difference between $\text{N}$ and $\text{F}$ is greater than that between $\text{N}$ and $\text{H}$, yet the dipole moment of $\text{NH}_3$ (1.5 D) is larger than that of $\text{NF}_3$ (0.2 D). This is because:
The correct shape and hybridisation for $\text{XeF}_4$ are:
Match Column-I with Column-II. Columns I and II represent complexes and magnetic moment (BM) respectively. **Column-I** (a) $[Fe(CN)_6]^{3-}$ (b) $[Fe(H_2O)_6]^{3+}$ (c) $[Fe(CN)_6]^{4-}$ (d) $[Fe(H_2O)_6]^{2+}$ **Column-II** (i) 5.92 BM (ii) 0 BM (iii) 4.90 BM (iv) 1.73 BM
Increasing order of bond length is:
Which of the following pairs share both isoelectronicity and isostructural characteristics? $\text{NO}_3^-$, $\text{CO}_3^{2-}$, $\text{ClO}_3^-$, $\text{SO}_3$
In which of the following pairs, the two species are iso-structural?
One turn of the helix in a B-form DNA is approximately:
The angular shape of ozone molecule ($O_3$) consists of:
The work done when $1 \text{ mole}$ of gas expands reversibly and isothermally from a pressure of $5 \text{ atm}$ to $1 \text{ atm}$ at $300 \text{ K}$ is: [Given: $\log 5 = 0.6989$ and $R = 8.314 \text{ J K}^{-1} \text{ mol}^{-1}$]