List of practice Questions

The following graph is obtained for a first-order reaction (A → P). The activation energy (E\(_a\) in kJ/mol\(^{-1}\)) and heat of reaction (ΔH in kJ/mol\(^{-1}\)) for this reaction are respectively
first-order reaction
Match the following:
List-I (Sol)List-II (Method of preparation)
A) \( \text{As}_2\text{S}_3 \)I) Bredig's arc method
B) \( \text{Au} \)II) Oxidation
C) \( \text{S} \)III) Hydrolysis
D) \( \text{Fe(OH)}_3 \)IV) Double decomposition
Identify the correct statements from the following:
A) Among alkali metal ions, Li⁺ has the highest hydration enthalpy.
B) Boiling point of alkali metals increases from Li to Cs.
C) Density of K is less than that of Na and Rb.
D) Li has strong tendency to form superoxide.
The correct order of electronegativity of group 13 elements is
Identify the correct statements from the following:
I) CO reduces the oxygen carrying ability of blood.
II) Producer gas contains CO and N₂.
III) C-O bond length in CO₂ is 115 pm.
The incorrect statement from the following is
The correct equation for one mole of a real gas is (a, b are constants)
The mass of a mixture containing NaCl and NaBr is 4.0 g. If Na is 20% of the total mixture, the composition of NaCl in the mixture is
For the following given equilibrium reaction, K\(_p\) is equal to 1076 at T(K). What is the value of T (in K)? \[ \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) \] Given that \( R = 0.082 \, \text{L atm K}^{-1} \text{mol}^{-1} \), \( K_p = 1076 \), the equation is: \[ K_p = 1076, \, R = 0.082 \, \text{L atm K}^{-1} \text{mol}^{-1} \]
In a common emitter transistor amplifier the resistance of collector is 3 kΩ. If the current amplification factor is 100 and the base resistance is 2 kΩ, then the power gain of the transistor is
The layer of the atmosphere that reflects low frequency (LF) electromagnetic waves during daytime only is
a, b, c, d are electromagnetic radiations. Frequencies of a, b, c are $3 \times 10^{15$ Hz, respectively, whereas the wavelength of c, d are 400 nm, 750 nm, respectively. The increasing order of their energies is}
The number of electrons with magnetic quantum number $m = 0$ in the elements with atomic numbers $Z = 24$ and $Z = 29$ are respectively
Which of the following orders is not correct for the given property?
Match the following
List-I (Molecule)List-II (Dipole moment in D)
A) \( \text{HCCl} \)I) \( 1.85 \, \text{D} \)
B) \( \text{NH}_3 \)II) \( 1.07 \, \text{D} \)
C) \( \text{H}_2\text{O} \)III) \( 0.23 \, \text{D} \)
D) \( \text{NF}_3 \)IV) \( 1.47 \, \text{D} \)
Which of the following sets are correctly matched?
MoleculeNumber of lone pairs of electrons on central atomHybridization
I) \( \text{PCF}_3 \)1\( \text{sp}^3 \)
II) \( \text{SO}_2 \)2\( \text{sp}^2 \)
III) \( \text{SF}_4 \)2\( \text{sp}^3d^2 \)
IV) \( \text{CF}_4 \)2\( \text{sp}^3 \)
When current in a coil changes from 2 A to 5 A in a time of 0.3 s, if the emf induced in the coil is 40 mV, then the self-inductance of the coil is
If a 10 W bulb emits electromagnetic waves uniformly in all directions, then the intensity of light at a distance 0.5 m from the source is nearly
The ratio of de Broglie wavelengths associated with thermal neutrons at temperatures 127°C and 352°C is
The ratio of the time periods of the revolution of the electrons in the second and third excited states of hydrogen atom is
If the surface areas of two nuclei are in the ratio 9 : 49, then the ratio of their mass numbers is
In the given options, the diode that is forward biased is
A capacitor of capacitance 2 μF is charged with the help of a 60 V battery. After disconnecting the battery, if this capacitor is connected in parallel with another uncharged capacitor of capacitance 1 μF, then the potential difference across the plates of the 2 μF capacitor is
The readings of the voltmeter and ammeter in the circuit shown in the diagram are respectively
readings of the voltmeter and ammeter
When two identical batteries of internal resistance 1 Ω each are connected in series across a resistor R, the rate of heat produced in R is P1. When the same batteries are connected in parallel across R, the rate of heat produced is P2. If P1 = 2P2, then the value of R is