List of top Chemistry Questions

The correct order of the metallic character of the elements Be, Al, Na, K is:
Assertion (A): 1-Bromopentane reacts with AgCN to give pentyl isocyanide.
Reason (R): AgCN is mainly ionic in nature.
0.05 mole of a non-volatile solute is dissolved in 500 g of water. What is the depression in freezing point of the resultant solution? ($K_f(\text{H}_2\text{O}) = 1.86 \, \text{K kg mol}^{-1}$)
On electrolysis of aqueous sodium butanoate, the hydrocarbon formed contains how many carbon atoms?
The time required for completion of 93.75% of a first order reaction is $x$ minutes. The half-life of it (in minutes) is
At T (K), x g of a non-volatile solid (molar mass 78 g mol$^{-1}$) when added to 0.5 kg water, lowered its freezing point by 1.0°C. What is x (in g)? (K$_f$ of water at T(K) = 1.86 K kg mol$^{-1}$)
In second period, X has second lowest first ionization enthalpy and Y has second highest. Identify X and Y.
Assertion (A): Blood cells collapse when suspended in saline water
Reason (R): Cell membrane dissolves in saline water
Assertion (A): Finely divided charcoal can act as an adsorbent
Reason (R): Finely divided material has small surface area
If the rate of disappearance of N$_2$O$_5$ in the following reaction is 1.2 $\times$ 10$^{-5}$ mol L$^{-1}$ s$^{-1}$, the rate of production of NO$_2$ (in mol L$^{-1}$ s$^{-1}$) is
2N$_2$O$_5$ (g) $\rightarrow$ 4NO$_2$ (g) + O$_2$ (g)
The ratio of rate of diffusion of SO$_2$ to CH$_4$ is
Which of the following expression is correct?
The correct order of coagulating power of the following ions to coagulate the positive sol is
I $[\text{Fe}(\text{CN})_6]^{4-}$, II $\text{Cl}^-$, III $\text{SO}_4^{2-}$
The colloidal solution used to treat stomach disorders is:
A cyclic process involves 3 states with 1 mole of ideal gas as follows:\ State 1: \( T = 300 \text{ K},\ P = 15 \text{ bar} \)\ State 2: \( T = 300 \text{ K},\ P = 10 \text{ bar} \)\ State 3: \( T = 300 \text{ K},\ P = 5 \text{ bar} \)\ Calculate the total work done during one complete cycle.
The compound that is used in smoke screens is:
Metal ‘M’ in the following reaction is: \[ 2 \text{MNO}_3 \rightarrow \text{M}_2\text{O} + 2\text{NO}_2 + \frac{1}{2}\text{O}_2 \]
Among the gases a, b, c, d, e, and f, the gases that show only positive deviation from ideal behavior at all pressures in the graph are:
Among the gases a, b, c, d, e, and f, the gases
Identify the major product from the following reaction sequence:
the major product from the following reaction sequence
The number of network solids and ionic solids in the list given below is respectively
H$_2$O (ice), AlN, Cu, CaF$_2$, diamond, MgO, CCl$_4$, ZnS, Ag, NaCl, SiO$_2$
Assertion (A): HCl gas is dried by passing through concentrated H$_2$SO$_4$
Reason (R): HCl gas reacts with NH$_3$ that gives white fumes
Identify the correct variation of pressure and volume of a real gas (A) and an ideal gas (B) at constant temperature.
($ y = P, x = V $)
Consider the following statements
Statement (A): The resistance of an ideal diode in forward biased condition is zero.
Statement (B): In a half wave rectifier, the load current flows only for every half cycle of the input signals.
Statement (C): In the breakdown region, a zener diode behaves as a constant voltage source.
Identify the major product from the following reaction sequence:
major product from the following reaction sequence
Reactant: 1-phenylpropanol
Which of the following reactions is not a disproportionation reaction?