List of practice Questions

A → P is a zero-order reaction. At 298 K, the rate constant of the reaction is \( 1 \times 10^{-3} \) mol L\(^{-1}\) s\(^{-1}\). Initial concentration of 'A' is 0.1 mol L\(^{-1}\). What is the concentration of 'A' after 10 sec?
Match List - I with List - II: \includegraphics[]{145.png}
Identify the method of preparation of a colloidal sol from the following:
The flux used in the preparation of wrought iron from cast iron in reverberatory furnace is:
\includegraphics[width=4cm]{148.png} X, Y are oxoacids of phosphorous. The number of P – OH bonds in X, Y respectively is:
Which of the following occurs with KMnO\(_4\) in neutral medium?
What are \( X \) and \( Y \) respectively in the following reaction sequence? \begin{center} \includegraphics[]{139.png} \end{center}
Identify the incorrect set from the following:
What is the boiling point (in K) of the urea solution from the given graph?
Evaluate the correctness of the given statements.
The number of extensive properties in the following list is: Enthalpy, density, volume, internal energy, temperature.
The values of \( a \) and \( b \) in the solubility product equation for barium phosphate are:
Hydrated sodium aluminum silicate is called:
Which one of the following statements is NOT correct about the compounds of alkaline earth metals?
Which of the allotropic forms of carbon is aromatic in nature?
The correct order of atomic radii of N, F, Al, Si is:
The correct order of covalent bond character of \( BCl_3, CCl_4, BeCl_2, LiCl \) is:
In which of the following pairs, both molecules possess dipole moment?
Identify the correct equation relating \( \Delta H \), \( \Delta U \), and \( \Delta T \) for 1 mole of an ideal gas (R = gas constant):
In an \( npn \) transistor circuit, the collector current is \( 10 \) mA. If \( 95% \) of the electrons emitted reach the collector, then the base current is nearly:
A transmitter of power 10 kW emits radio waves of wavelength 500 m. The number of photons emitted per second by the transmitter is of the order of:
The difference in radii between fourth and third Bohr orbits of \( He^+ \) (in m) is:
If \( \lambda_0 \) and \( \lambda \) are respectively the threshold wavelength and wavelength of incident light, the velocity of photoelectrons ejected from the metal surface is:
At a place the horizontal component of earth’s magnetic field is \( 3 \times 10^{-5} \) T and the magnetic declination is \( 30^\circ \). A compass needle of magnetic moment \( 18 \) A\(m^2\) pointing towards geographic north at this place experiences a torque of:
In case of diffraction, if \( a \) is a slit width and \( \lambda \) is the wavelength of the incident light, then the required condition for diffraction to take place is: