List of practice Questions

Identify the correct statements about photochemical smog
I. PAN is one of the components of photochemical smog
II. It forms cracks in rubber
III. It is an oxidizing smog

Aniline can be separated from a mixture of chloroform - aniline by a technique X and from aniline - water mixture by technique Y. X and Y respectively are

Consider the following statements
Statement I: The electronic configuration of $N_2$ in terms of molecular orbital theory is $KK (\sigma 2s)^2 (\sigma^* 2s)^2 (\pi 2p_x)^2 (\pi 2p_y)^2 (\pi 2p_z)^2$.
Statement II: According to molecular orbital theory, the double bond in $C_2$ molecule consists of two $\pi$ bonds.
The correct answer is

The isobar of one mole of an ideal gas was obtained at P atm. The slope of the isobar is $0.82 L K^{-1}$. What is P (in atm)?

A hydrocarbon containing C and H has 75% (by weight) of carbon. 32g of this hydrocarbon was completely burnt in air. What is the weight (in kg) of $CO_2$ formed?

Observe the following equation
$H_2O_2(g) \rightarrow 2H(g) + 2O(g)$; $\Delta_a H^\ominus = 1066 \, kJ mol^{-1}$.
If $\Delta_{O-H} H^\ominus$ is $464 \, kJ mol^{-1}$, then $\Delta_{O-O} H^\ominus$ (in $kJ mol^{-1}$) value will be

At $27^\circ C$, the $K_a$ of acetic acid is $1.8 \times 10^{-5}$. What is the percentage of ionization of 0.02M of this acid at $27^\circ C$?

Observe the following unbalanced equations:
(I) $H_2O(l) + Na(s) \rightarrow$
(II) $H_2O(l) + F_2(g) \rightarrow$
Identify the correct statement.

If the maximum and minimum amplitudes of an amplitude modulated wave are 9 V and 3 V respectively, then the modulation index is

Identify the correct statements:
I. In the visible spectrum, violet light has highest frequency and red light has lowest frequency.
II. When white light is passed through a prism, violet light is deviated the most and red light is deviated the least.
III. Hydrogen atoms in gas phase exhibit line spectrum.

The emission spectrum of hydrogen contains a few lines. The energy ($\Delta E$) of one of the lines is $0.4578 \times 10^{-18}J$. The $n_1$ and $n_2$ belonging to this line are respectively

Among the following the isoelectronic species are
I. $Mg^{2+}, Al^{3+}, F^-$
II. $O^{2-}, F^-, N^{3-}$
III. $K^+, Ca^{2+}, Sc^{3+}$
IV. $Mn^{2+}, Fe^{3+}, V^{3+}$

Which of the following sets are correctly matched?

The correct order of bond angle of $HgCl_2 (A)$, $NH_3 (B)$, $H_2O (C)$ is

If electrons of mass 'm' and de Broglie wavelength '$\lambda$', incident on a metal plate in an X-ray tube, then the minimum wavelength of X-rays emitted is
(h = Planck's constant and c = Speed of light in vacuum)

If the potential energy of an electron in an orbit of hydrogen atom is $-6.80$ eV, then the energy required to ionize the atom is

If the half life of an element is 10 minutes, then the time taken (in minutes) for the element to decay from 20% to 80% is

If mass of 5 neutrons is x, mass of 2 protons is y and the mass of the nucleus $_{10}X^{20}$ is z, then the binding energy of the nucleus X is (Speed of light in vacuum is c)

If the breakdown voltage of a Zener diode is 7.2 V and the maximum power dissipated is 216 mW, then the maximum current through the Zener diode is

For a common emitter transistor amplifier, the voltage across the collector resistance is 2.8 V. If the current amplification factor of the transistor is 70 and the collector resistance is 2 k$\Omega$, then the base current is

An electron moving along a straight line with a velocity of $6.4 \times 10^7 ms^{-1}$ is subjected to a magnetic field of 3 mT. If the magnetic field is applied perpendicular to the direction of the initial path of the electron, then the radius of the circular path in which the electron moves under the influence of the magnetic field is (Mass of electron $= 9 \times 10^{-31}$ kg and charge of the electron $= 1.6 \times 10^{-19}$ C)

A straight wire of length 90 cm carrying a current of 3 A is bent in the form of an equilateral triangular loop and is placed in a uniform magnetic field of $8 \times 10^{-4}$ T such that the plane of the loop makes an angle of $30^{\circ}$ with the direction of the magnetic field. The torque acting on the triangular loop is

If the permeability of a substance is $616 \times 10^{-5} \, NA^{-2}$, then the susceptibility of the substance is

If the current passing through an inductor is increased by 20%, then the percentage increase in the energy stored in the inductor is

In an LCR series circuit, if $\frac{1}{\omega C}<\omega L$, then the incorrect option among the following is ($\omega$-angular frequency, C-capacitance and L-inductance)