List of top Questions asked in KCET, WBJEE

From the diagram

\( \Delta H \) for the reaction C → A is:

A metalloid is:

The value of 'A' in the equation \( \lambda_m = \lambda_m^0 - A\sqrt{C} \) is same for the pair

In the analysis of III group basic radicals of salts, the purpose of adding NH₄Cl (solid) to NH₄OH is:

A haloalkane undergoes $S_{N^2}$ or $S_{N^1}$ reaction depending on:

The complex compounds [Co(NH₃)₅SO₄]Br and [Co(NH₃)₅Br]SO₄ are:

But-1-yne on reaction with dilute H2​SO4​ in the presence of Hg2+ ions at 333K gives:

Which one of the following is a cationic detergent?

A current of 3 A is passed through a molten calcium salt for 1 hr 47 min 13 sec. The mass of calcium deposited is:

Which one of the following pairs will show positive deviation from Raoult's Law?

Which one of the following nitrates will decompose to give NO₂ on heating?

For the coagulation of positively charged hydrated ferric-oxide sol, the flocculating power of the ions is in the order:

Biologically active adrenaline and ephedrine used to increase blood pressure contain

0.48 g of an organic compound on complete combustion produced 0.22 g of CO₂. The percentage of C in the given organic compound is:

The first chlorinated organic insecticide prepared is:

Sodium ethanoate on heating with soda lime gives ‘X’. Electrolysis of aqueous solution of sodium ethanoate gives ‘Y’. ‘X’ and ‘Y’ respectively are:

The incorrect statement about the Hall-Heroult process is:

A pair of isoelectronic species having a bond order of one is:

On treating 100 mL of 0.1 M aqueous solution of the complex CrCl₃.6H₂O with excess of AgNO₃, 2.86 g of AgCl was obtained. The complex is:

For the reaction PCl5​→PCl3​+Cl2​, the rate and rate constant are 1.02×10−4mol L−1s−1 and 3.4×10−5s−1, respectively, at a given instant. The molar concentration of PCl5​ at that instant is:

In the reaction: \(\text{Aniline} \xrightarrow{\text{NaNO}_2/\text{dil. HCl}} P \xrightarrow{\text{Phenol/NaOH}} Q\)