List of top Chemistry Questions asked in LPUNEST

The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with:
The carbon bond length in benzene is:
A \(6%\) solution of urea is isotonic with:
In countries nearer to polar region, the roads are sprinkled with \(\text{CaCl}_2\). This is:
A compound of ‘A’ and ‘B’ crystallises in a cubic lattice in which ‘A’ atoms occupy the lattice points at the corners of the cube. The ‘B’ atoms occupy the centre of each face of the cube. The probable empirical formula of the compound is:
The one which decreases with dilution is:
In electrophilic aromatic substitution reaction, the nitro group is meta directing because it:
Vapour pressure of pure ‘A’ is \(70\ \text{mm of Hg}\) at \(25^\circ\text{C}\). It forms an ideal solution with ‘B’ in which mole fraction of A is \(0.8\). If the vapour pressure of the solution is \(84\ \text{mm of Hg}\) at \(25^\circ\text{C}\), the vapour pressure of pure ‘B’ at \(25^\circ\text{C}\) is:
\(10^{-6}\,\text{M}\) NaOH is diluted 100 times. The pH of the diluted base is:
In the electrolysis of acidulated water, it is desired to obtain \(1.12\ \text{cc}\) of hydrogen per second under STP condition. The current to be passed is:

Number of photons emitted by 10 watt bulb in 10 seconds, if wavelength of light is 1000 \(\AA\) is

K$_{sp}$ of Mg(OH)$_2$ is \(1\times10^{-12}\). 0.01 M MgCl$_2$ solution will precipitate when limiting pH is

In a reaction involving ring substitution of \(C_6H_5Y\), the major product is the meta-isomer. The group \(Y\) can be:

Gutta-percha, a naturally occurring highly crystalline non-elastic rubber, consists of:
Which of the following statement is not correct?
The drug used for the treatment of throat infection is:
Statement–I: Glucose is in pyranose form and has free anomeric hydroxyl group. Statement–II: In sucrose, glucose is in pyranose form and fructose is in furanose form.
Identify the correct compound formed in the reaction \[ (CH_3)_2NH \xrightarrow[\;KMno_4\;]{} A,\qquad (CH_3)NH \xrightarrow[\;H_2SO_4\;]{} B \]
The EAN of Co(CO)$_4$ is 35. It attains stability by
For the reaction shown, the product formed is:
29.5 mg of organic compound contains N. Ammonia from Kjeldahl method absorbed in 20 mL of 0.1 M HCl. Excess acid requires 15 mL of 0.1 M NaOH for neutralization. The percentage of nitrogen in compound is
How many monochloro derivatives are possible when 3-methylpentane is subjected to free radical chlorination (including isomers)?
Hyper conjugation involves overlap of following orbitals
What volume of methane at NTP is formed from 8.2 g sodium acetate fused with soda lime
Carcinogenic pollutant in the following is