List of practice Questions

Consider two half-cells based on the reaction $A g^{+}(a q)+e^{-} \rightarrow A g(s)$ The left half-cell contains $A g^{+}$ions at unit concentration, and the right half-cell initially had the same concentration of $A g^{+}$ions, but just enough $NaCl_{(a q)}$ had been added to completely precipitate the $A g_{(a q)}^{+}$as $AgCl$. If the emf of the cell is $0.29\, V$, the $\log _{10} K_{s p}$ would have been
When $Cl_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of
Two spheres $A$ and $B$ of masses $m_1$ and $m_2$ respectively collide. $A$ is at rest initially and $B$ is moving with velocity $v/2$ along x-axis. After collision $B$ has a velocity in a direction perpendicular to the original direction. The mass $A$ moves after collision in the direction
The magnetic flux linked with a coil satisfies the relation $\phi= (4t^2 + 6t + 9) Wb$, where $t$ is the time in second. The e.m.f. induced in the coil at $t\, =\, 2$ second is
The site of Krebs cycle is
The Lac Operon is turned on when allolactose molecules bind to :
Which of the statements is not true?
A metal crystallizes with a face-centered cubic lattice. The edge of the unit cell is $408\, pm$. The diameter of the metal atom is
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be:
A nucleophilic substitution reaction proceeds through $S _{ N } 1$ mechanism. So, the reaction is
The molecules in an ideal gas at $27^{\circ} C$ have a certain mean velocity. At what approximate temperature, will the mean velocity be doubled?
Dimension of universal gas constant $(R)$ is
A uniform rod of length $L$ and mass $M$ is held vertical, with its bottom end pivoted to the floor. The rod falls under gravity, freely turning about the pivot. If acceleration due to gravity is $g$, what is the instantaneous angular speed of the rod when it makes an angle $60^{\circ}$ with the vertical?
A travelling harmonic wave on a string is described by $y$ = 7.5 sin (0.005$x$ + 12$t$) in metre. Its time period in second is
The product of reaction between aniline and acetic anhydride is
What are the dimensions of electrical conductivity?
The $ C-H $ bond distance is the longest in
The correct order of electron gain enthalpy $ (\Delta _{eg}H) $ of the halogen atoms is
Which of the following optical phenomena is involved in the propagation of light in an optical fibre?
$50\, mL$ of each gas A and of gas B takes $150$ and $200\, s$ respectively for effusing through a pin hole under the similar conditions. If molecular mass of gas B is $36,$ the molecular mass of gas A will be
A carpet of mass $m$ made of inextensible material is rolled along its length in the form of a cylinder of radius $r$ and kept on a rough floor. The decrease in the potential energy of the system, when the carpet is unrolled to a radius $\frac{r}{2}$ without sliding is $(g=$ acceleration due to gravity)
If $p :$ The earth is round, $q : 3 + 4 = 7 $ then $\left(\sim p\right)\vee\left(\sim q\right)$ is
If $\frac{\sin x}{\cos x} \times \frac{\sec x}{\operatorname{cosec} x} \times \frac{\tan x}{\cot x}=9, $ where $x \in\left(0, \frac{\pi}{2}\right)$, then the value of $x$ is equal to
The element with positive electron gain enthalpy is