List of top Questions asked in JEE Main

Match the List I with List II

	List I		List II
(A)	Weak intermolecular forces of attraction	I	Hexamethylenedia mine + adipic acid
(B)	Hydrogen bonding	II	AlEt₃+ TiCl₄
(C)	Heavily branched polymer	III	2-chloro-1, 3-butadiene
(D)	High density polymer	III	phenol+ formaldehyde

choose the correct answer from the options given below:

Which of the following compound is optically active?

Among the following four aromatic compounds, which one will have the lowest melting point?

Amongst the following, the most basic compound is:

Which one of the following species will disproportionate in the following reduction potential diagra

Chemical A is used for water softening to remove temporary hardness, A reacts with Na2Co3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. If the chemical formula of A is $Ca (OH)_{2} + CO_{2} \rightarrow CaCo_{?} \downarrow + H_{2}O $ then what is the value of ?

In the following reaction, ' $A$ ' is

Bond dissociation energy of

X Y, X_{2}

, and

Y_{2}

(all diatomic molecules) are in the ratio of

1 : 1 : 0.5

and

Δ H_{f}

of

X Y

is

- 100 k J {m o l}^{- 1}

. The bond dissociation energy of

X_{2}

is

100 x .

The value of

x

is

Given below are two statements:
Statement I: SO$_2$ and H$_2$O both possess V-shaped structures.
Statement II: The bond angle of SO$_2$ is less than that of H$_2$O. In the light of the above statements, choose the most appropriate answer from the options given below:

Ba+2 cannot be precipitated as?

Which of the following is a set of essential amino acids?

2

g of a base whose equivalent weight is

40

reacts with

3 g

of an acid. The equivalent weight of the acid is:

Match List I with List II

List I Test		List II Functional group / Class of Compound
A	Molisch's Test	I	Peptide
B	Biuret Test	II	Carbohydrate
C	Carbylamine Test	III	Primary amine
D	Schiff's Test	IV	Aldehyde

Choose the correct answer from the options given below:

Given:
(i)

{C u}^{2 +} + 2 e^{-} \to C u, E^{0} = 0.337 V

(ii)

{C u}^{2 +} + e^{-} \to {C u}^{+}, E^{0} = 0.153

Standard electrode potential,

E^{\circ}

for the reaction,

C u + e^{-} \to C u

, will be (in volts):

The resistance $ R = \frac{V}{I} $ where $ V = (200 \pm 5) \, \text{V} $ and $ I = (20 \pm 0.2) \, \text{A} $. The percentage error in the measurement of $ R $ is:

A current i is flowing through the loop. The direction of the current and the shape of the loop are as shown in the figure.The magnetic field at the centre of the loop is,

\frac{μ_{0} i}{R}

times

[ MA = R , MB = 2R,

∠

DMA = 90°]

Which of the following is metal compound semiconductor?

In the formula,

X = 3 Y Z^{2}, X

and

Z

have dimensions of capacitance and magnetic field respectively. What are the dimensions of

Y

in the MKSQ system?

In the pure inductive circuit, the curves between frequency

f

and reciprocal of inductive reactance

\frac{1}{X_{L}}

is:

In a discharging RC circuit, at what time the electrical potential energy will become the half of its initial value? [in terms of time constant of RC circuit,]

Find the amount of work done in rotating a dipole of dipole moment