List of top Questions asked in UPCATET

Oxidation number of hydrogen is (-1) in:
The group which shows \(-I\) and \(-R\) effect is:
Hybridisation of \(\mathrm{Ni}\) in \(\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-\) is:}
Solubility of \(\mathrm{AgCl}\) in \(10^{-2} \text{M} \mathrm{NaCl}\) solution is (\( K_{sp_{\mathrm{AgCl}}} = 1.8 \times 10^{-10} \)):
In the balanced redox reaction \(\mathrm{Cr}_2\mathrm{O}_7^{2-} + \mathrm{SO}_3^{2-} \longrightarrow \mathrm{Cr}^{3+} + \mathrm{SO}_4^{2-}\), the ratio of the number of \(\mathrm{Cr}_2\mathrm{O}_7^{2-}\) ions to \(\mathrm{SO}_4^{2-}\) ions is:
No work is done during free expansion of an ideal gas:
Minimum bond length is of:
Polar molecule among the following is:
If a radiation of energy \( 4.25 \, \text{eV} \) falls on a metal surface, then the maximum kinetic energy of ejected electrons will be (work function of metal is \( 2.25 \, \text{eV} \)).
Incorrect match of IUPAC symbol of elements with its respective atomic number is:
Relation between rate constant and half-life for a first-order reaction is:
Statement (A): Alkyl halides are not soluble in water.
Statement (B): Alkyl halides do not form H-bonds with water molecules through alkyl halide, but they are polar in nature. In light of the above statements, choose the most appropriate answer from the options given below:
The given reaction is known as: \[ \text{PhCH}_2\text{CN} + \text{SnCl}_2 + \text{HCl} \xrightarrow{\text{H}_3\text{O}^+} \text{PhCH}_2\text{CH=NH} \]
Given below are two statements:
Statement I: Propene on treatment with diborane gives an addition product with the formula \( \left( (CH_3)_2 CH \right)_3 B \)
Statement II: Oxidation of \( \left( (CH_3)_2 CH \right)_3 B \) with Hydrogen peroxide in the presence of NaOH gives propan-2-ol
In the light of the above statements, choose the most appropriate answer from the options given below:
If an 18 $\Omega$ resistance wire is bent into the shape of an equilateral triangle, then the equivalent resistance across the ends of any side = ?
A particle of mass \( m \) kg is suspended by a weightless string. The horizontal force that is required to displace it until the string makes an angle of \( 45^\circ \) with the initial vertical direction is:
An object of mass \( 3 \, \text{kg} \) is at rest. Now a force of \( \vec{F} = 6t^2 \hat{i} + 4t \hat{j} \) is applied on the object. The velocity of the object at \( t = 3 \, \text{s} \) is:
AU measures:
Which property of light is used in an optical fiber?
An intrinsic semiconductor is converted into n-type extrinsic semiconductor by doping it with:
A body of mass \( m = 3.513 \, \text{kg} \) is moving along the X-axis with a speed of \( 5.00 \, \text{ms}^{-1} \). The magnitude of its momentum is recorded as:
De-Broglie wavelength of $\alpha$ particle is the same as that of a proton moving with (1/10) of velocity as the speed of light. The ratio of K.E. of proton to that of $\alpha$ particle is:
In hydrogen spectrum, the shortest wavelength in the Balmer series is \( \lambda \). The shortest wavelength in the Bracket series is:
Energy is not carried by
The process of heat transfer in which heat is transferred with actual migration of medium particles is known as