List of top Chemistry Questions asked in UPSEE

Which of the following is not permissible arrangement of electrons in an atom.

Which of the following carbohydrates are branched polymer of glucose

Average atomic weight of an element M is 51.7. If two isotopes of $M, M^{50}$ and $M^{52}$ are present, then percentage of occurrence of $M^{50}$ in nature will be.

The number of structural isomers for $ {C_6H_{14}}$ is

$ {B2H6}$ reacts with $ {(CH3)3N}$ to produce

Bleaching powder contains a salt of an oxoacid as one of its components. The anhydride of that oxoacid is

The vapour density of a mixture containing $ {NO2}$ and $ {N2O4}$ is 38.3 at $ {27^{\circ}C}$. What will be the mole of $ {NO_2}$ in 100 mole mixture.

The following graph shows how $(t_{1/2})$ a (half life) of a reactant R changes with the initial reactant concentration $a_0$. The order of the reaction will be

Which of the following is the correct IUPAC name of the following structure

Kelvin equation is related to

Which of the following alcohol is dehydrated most easily by concentrated $ {H_2SO_4}$

What is the correct volume of equilibrium constant for the following reaction at 400 K if the values of $\Delta H^{\circ}$ is 77.5 kJ $mol^{-1}$ and $ {\Delta S^{\circ} = 135 \; JK^{-1} \; mol^{-1}}$ $ {2NOCl{(g)} <=> 2NO{(g)} + Cl_2{(g)}}$

The reaction $ { P_4 + 3NaOH + 3H_2O \to 3NaH_2PO_2 + PH_3} $ is an example of

The normal dehydrating agent, used in a laboratory is

The correct decreasing order of the boiling points of compounds $ {H_2O, HF}$ and $ {NH3}$ is

For the following three reactions (i), (ii) and (iii), equilibrium constants are given (i) $ {CO_{(g)} + H_2O_{(g)} <=> CO_{2(g)} + H_{2(g)} ; K_1}$ (ii) $ { CH_{4(g)} + H_2O_{(g)} <=> CO_{(g)} 3H_{2(g)} ; K_2}$ (iii) $ {CH_{4(g)} + 2H_2O_{(g)} <=> CO_{2(g)} + 4H_{2(g)} ; K _3}$ Which of the following relation is correct?

Find the major product (Considering E as the electrophile) when the following substrate is subjected to electrophilic aromatic substitution

Covalent molecules are usually held in a crystal structure by

Titration curve if a strong base is titrated with strong acid is

The molecules of which of the following gases has the highest speed?

Which of the following oxides would be reduced by C? ${Al_2 O_3, MgO, ZnO , CaO, Fe_2 O_3 , PbO} $

Nylon 66 is formed by

In which compound does H show O. N of -1?

Why is the heat evolved in neutralization of HF is highest