List of top Chemistry Questions

What are x and y in the following reaction?
$x \text{Pb}_3\text{O}_4 \rightarrow y \text{PbO} + \text{O}_2$
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): Blood cells collapse when suspended in saline water
Reason (R): Cell membrane dissolves in saline water
The compound or ion which is not aromatic in the following is
If molten NaCl contains SrCl$_2$ as impurity, crystallization can generate
The reduction potential of hydrogen electrode at 25°C in a neutral solution is (P$_{H_2}$ = 1 bar)
What are X and Y respectively in the following reactions?
\( \text{X} + \text{D}_2\text{O} \rightarrow \text{CD}_2 + \text{P} \)
\( \text{Y} + \text{D}_2\text{O} \rightarrow \text{CD}_4 + \text{Q} \)
Which of the following tetrahalides does not exist?
Identify the correct statements about Boron:
I. It has high melting point.
II. It has high density.
III. It has high electrical conductivity.
IV. B-10 isotope of it has high ability to absorb neutrons
The correct order of acidity of the following is:
order of acidity
Equal volumes of 0.5 N acetic acid and 0.5 N sodium acetate are mixed. What is the pH of resultant solution?
(\( \text{p}K_a \) of acetic acid = 4.75)
The formation of ammonia from its constituent elements is an exothermic reaction. \ The effect of increase in temperature on the reaction equilibrium is:
Identify the reaction/process in which the entropy increases.
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
The statement related to law of definite proportions 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.
Choose the correct option from the following:
The correct order of the metallic character of the elements Be, Al, Na, K is:
If \( \Delta x \) is the uncertainty in position and \( \Delta v \) is the uncertainty in velocity of a particle and both are equal, then the correct expression for uncertainty in momentum for the same particle is:
The number of radial nodes and angular nodes in a 4f orbital are respectively:
Lithium shows diagonal relationship with element X and aluminum with element Y. Identify X and Y respectively.
For a reaction \( 2\text{CO (g)} + \text{O}_2 \text{(g)} \rightarrow 2\text{CO}_2 \text{(g)} \), Given: \[ \Delta_r G^\circ = -128 \, \text{kJ}, \quad \Delta_r S^\circ = -40 \, \text{JK}^{-1}, \quad T = 300 \, \text{K} \] Calculate \( \Delta_r U \) (in kJ).
On electrolysis of aqueous sodium butanoate, the hydrocarbon formed contains how many carbon atoms?
Identify the major product formed from the following reaction sequence:
major product formed from the following reaction sequence:
Identify the major product from the following reaction sequence:
major product from the following reaction sequence
Reactant: 1-phenylpropanol