JEE Main 2020 (Online) 8th January Morning Slot

Arrange the following compounds in increasing order of C–OH bond length : methanol, phenol,
p-ethoxyphenol

The major product of the following reaction is :

The most suitable reagent for the given conversion is :

The predominant intermolecular forces present in ethyl acetate, a liquid, are:

A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63oC while the
other boils at 60oC What is the best way to separate the two liquids and which one will be distilled out first ?

Which of the following statement is not true for glucose?

The rate of a certain biochemical reaction at physiological temperature (T) occurs 106 times faster with
enzyme than without. The change in the activation energy upon adding enzyme is :

The number of chiral centres in penicillin is _________.

The major products A and B in the following reactions are :

The complex that can show fac- and mer-isomers is :

What would be the electrode potential for the given half cell reaction at pH = 5?
______.
2H2O \(\to\) O2 + 4H\(\oplus\) + 4e– ;
\(E_{red}^0\) = 1.23 V
(R = 8.314 J mol–1 K–1 ; Temp = 298 k; oxygen under std. atm. pressure of 1 bar)

Among the gases (a) – (e), the gases that cause greenhouse effect are :
(a) CO2
(b) H2O
(c) CFCs
(d) O2
(e) O3

The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is :

The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively :

The strength of an aqueous NaOH solution is most accurately determined by titrating : (Note : consider that
an appropriate indicator is used)

The number of bonds between sulphur and oxygen atoms in
S2O82- and the number of bonds between sulphur
and sulphur atoms in rhombic sulphur, respectively, are :

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :

The third ionization enthalpy is minimum for :

When gypsum is heated to 393 K, it forms :

A graph of vapour pressure and temperature for three different liquids X, Y, and Z is shown below :

The following inferences are made :
(A) X has higher intermolecular interactions compared to Y.
(B) X has lower intermolecular interactions...

The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of
[Co(NH3)6]Cl3 is ________.
M[Co(NH3)6Cl3] = 267.46 g/mol
MAgNO3 = 169.87 g/mol

Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to
achieve 10 ppm of iron in 100 kg of wheat is _______.
Atomic weight : Fe = 55.85; S = 32.00;
O = 16.00

For the Balmer series in the spectrum of H atom,
\(\overline \nu = {R_H}\left\{ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right\}\), the correct statements among (I) to (IV)
are :
(I) As wavelength decreases, the lines in the series conver...

As per Hardy-Schulze formulation, the flocculation values of the following for ferric hydroxide sol are in the
order :

The magnitude of work done by a gas that undergoes a reversible expansion along the path ABC shown in
the figure is _______.