List of practice Questions

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is 2.72 g cm-3. The molar mass of the metal is
(NA Avogadro's constant = 6.02 × 1023 mol-1)
Dipole-induced dipole interactions are present in which of the following pairs ?
Roasting of sulphides gives the gas X as a by-product. This is a colorless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reducing agent and its acid has never been isolated. The gas X is
Based on equation E = -2.178 x 10-18 J\((\frac{Z^2}{n^2})\) certain conclusions are written. Which of them is not correct ?
A button cell used in watches functions as following
Zn(s) + Ag2O(s) + H2O(l) ⇌ 2Ag(s) + Zn2+ (aq) + 20H- (aq)
If half cell potentials are
Zn2+(aq) + 2e- → Zn(s); E° = -0.76 V
Ag2O(s) + H2O(l) + 2e- → 2Ag(s) + 20H-(aq),
E° = 0.34 V
The cell potential will be
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3.
A coil is self-inductance $L$ is connected in series with a bulb $B$ and an $AC$ source. Brightness of the bulb decreases when :
The characteristics of class Reptilia are
Crystal field stabilisation energy for high spin $d^4$ octahedral complex is
The anion of acetylacetone (acac) forms $Co (acac)_3$ chelate with $Co^{3+}$. The rings of the chelate are :
Some reactions of amines are given. Which one is not correct ?
$6.02 \times 10^{20}$ molecules of urea are present in 100 mL of its solution. The concentration of solution is :-
During sewage treatment biogas produced includes
H-zone in skeletal muscle fibre is due to
Which of the following statements is correct in relation to the endocrine system ?
If the area of the auxiliary circle of the ellipse $\frac {x^2}{a^2}+\frac {y^2}{b^2}=1 (a >\, b)$ is twice the area of the ellipse, then the eccentricity of the ellipse is
Consider the half-cell reduction reaction :- $Mn^{2+}+2e^{-}\to Mn, E^{0}=-1.18 V$ $Mn^{2+}\to Mn^{3+}+e^{-}, E^{0}=-1.51 V$ The $E^\circ$ for the reaction $3 Mn^{2+}\to Mn^{0}+2Mn^{3+}$ and possibility of the forward reaction are respectively :
Two metal rods $1$ and $2$ of same lengths have same temperature difference between their ends. Their thermal conductivities are $ K_1$ and $K_2 $ and cross sectional areas $ A_1 $ and $ A_ 2 $ respectively. If the rate of heat conduction in 1 is four times that in 2, then :
A reaction having equal energies of activation for forward and reverse reactions has :-
The colonies of recombinant bacteria appear white in contrast to blue colonies of nonrecombinant bacteria because of
Artificial insemination means :
An electric charge does not have which of hte following properties?
Five persons entered the lift cabin on the ground floor of an eight floor house. Suppose that each of them independently and with equal probability can leave the cabin at any floor beginning with the first, then the probability of all $5$ persons leaving at different floors is
$C _{6} H _{5} COCl \xrightarrow{ NH _{3}} X \xrightarrow{ P _{2} O _{5}} Y \xrightarrow [H_2]{ Ni }Z$ The end product in the above sequence of reaction is
Which of the following gases has the highest value of $rms$ velocity at $298\, K$?