JEE Main 2021 (Online) 26th February Evening Shift

Ceric ammonium nitrate and CHCl3/alc. KOH are used for the identification of functional groups present in __________ and _______ respectively.

Identify A in the given reaction.

2, 4-DNP test can be used to identify :

Considering the above reaction, the major product among the following is :

Identify A in the following chemical reaction.

Identify A in the given chemical reaction.

Match List - I with List - II.



List - I

List - II




(a)
Sucrose
(i)
\(\beta\)-D-Galactose and \(\beta\)-D-Glucose


(b)
Lactose
(ii)
\(\alpha\)-D-Glucose and \(\beta\)-D-F...

Match List - I with List - II.



List - I (Molecule)

List - II (Bond order)




(a)
\(N{e_2}\)
(i)
1


(b)
\({N_2}\)
(ii)
2


(c)
\({F_2}\)
(iii)
0


(d...

If the activation energy of a reaction is 80.9 kJ mol\(-\)1, the fraction of molecules at 700 K, having enough energy to react to form products is e\(-\)x. The value of x is __________. (Rounded off to the nearest integer) [Use R = 8.31 J K...

A. Phenyl methanamineB. N,N-DimethylanilineC. N-Methyl anilineD. BenzenamineChoose the correct order of basic nature of the above amines.

The number of stereoisomers possible for [Co(ox)2(Br)(NH3)]2\(-\) is ___________. [ox = oxalate]

In mildly alkaline medium, thiosulphate ion is oxidized by \(MnO_4^ -\) to "A". The oxidation state of sulphur in "A" is __________.

Emf of the following cell at 298K in V is x \(\times\) 10\(-\)2.Zn|Zn2+(0.1 M)||Ag+ (0.01 M)|AgThe value of x is _________. (Rounded off to the nearest integer)[Given : $$E_{Z{n^{2 + }}/Zn}^\theta = - 0.76V;E_{A{g^{2 + }}/Ag}^\theta = +...

Match List - I with List - II.Choose the correct answer from the options given below :

In \(\mathop C\limits^1 {H_2} = \mathop C\limits^2 = \mathop C\limits^3 H - \mathop C\limits^4 {H_3}\) molecule, the hybridization of carbon 1, 2, 3 and 4 respectively, are :

The pH of ammonium phosphate solution, if pka of phosphoric acid and pkb of ammonium hydroxide are 5.23 and 4.75 respectively, is ___________.

Match List - I with List - II.



List - I

List - II




(a)
Siderite
(i)
Cu


(b)
Calamine
(ii)
Ca


(c)
Malachite
(iii)
Fe


(d)
Cryolite
(iv)...

Match List - I with List - II.



List - I

List - II




(a)
Sodium Carbonate
(i)
Deacon


(b)
Titanium
(ii)
Castner-Kellner


(c)
Chlorine
(iii)
van-Arkel

...

Calgon is used for water treatment. Which of the following statement is NOT true about Calgon?

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.Assertion A : In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.Reason R : Tl metal has fourteen f electrons in its...

The correct order of electron gain enthalpy is :

Which pair of oxides is acidic in nature?

Seliwanoff test and Xanthoproteic test are used for the identification of ___________ and ________ respectively.

The number of octahedral voids per lattice site in a lattice is _________. (Rounded off to the nearest integer)

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of solution was found to be \(-\)0.93\(^\circ\)C (Kf(H2O) = 1.86 K kg mol\(-\)1). The number (n) of benzoic acid molecules associated (assuming 100% association)...

The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per mL is _________ g. (Rounded off to the nearest integer)[Given : Atomic weight in g mol\(-\)1 - Na : 23; N : 14; O : 16]

A ball weighing 10 g is moving with a velocity of 90 ms\(-\)1. If the uncertainty in its velocity is 5%, then the uncertainty in its position is ___________ \(\times\) 10\(-\)33 m. (Rounded off to the nearest integer)[Given : h = 6.63 $$\ti...

Which of the following forms of hydrogen emits low energy \(\beta\)- particles?

The nature of charge on resulting colloidal particles when FeCl3 is added to excess of hot water is :

The average S-F bond energy in kJ mol\(-\)1 of SF6 is _____________. (Rounded off to the nearest integer)[Given : The values of standard enthalpy of formation of SF6(g), S(g) and F(g) are - 1100, 275 and 80 kJ mol\(-\)1 respectively.]

Let L be a line obtained from the intersection of two planes x + 2y + z = 6 and y + 2z = 4. If point P(\(\alpha\), \(\beta\), \(\gamma\)) is the foot of perpendicular from (3, 2, 1) on L, then the value of 21(\(\alpha\) + \(\beta\) + $$\gam...

If the mirror image of the point (1, 3, 5) with respect to the plane 4x \(-\) 5y + 2z = 8 is (\(\alpha\), \(\beta\), \(\gamma\)), then 5(\(\alpha\) + \(\beta\) + \(\gamma\)) equals :

Let a be an integer such that all the real roots of the polynomial 2x5 + 5x4 + 10x3 + 10x2 + 10x + 10 lie in the interval (a, a + 1). Then, |a| is equal to ___________.

Let the normals at all the points on a given curve pass through a fixed point (a, b). If the curve passes through (3, \(-\)3) and (4, \(-\)2\(\sqrt 2\)), and given that a \(-\) 2\(\sqrt 2\) b = 3, then (a2 + b2 + ab) is equal to _________...

Let slope of the tangent line to a curve at any point P(x, y) be given by \({{x{y^2} + y} \over x}\). If the curve intersects the line x + 2y = 4 at x = \(-\)2, then the value of y, for which the point (3, y) lies on the curve, is :

Let A1 be the area of the region bounded by the curves y = sinx, y = cosx and y-axis in the first quadrant. Also, let A2 be the area of the region bounded by the curves y = sinx, y = cosx, x-axis and x = \({\pi \over 2}\) in the first quad...

If the locus of the mid-point of the line segment from the point (3, 2) to a point on the circle, x2 + y2 = 1 is a circle of radius r, then r is equal to :

Let A(1, 4) and B(1, \(-\)5) be two points. Let P be a point on the circle (x \(-\) 1)2 + (y \(-\) 1)2 = 1 such that (PA)2 + (PB)2 have maximum value, then the points, P, A and B lie on :

Let z be those complex numbers which satisfy| z + 5 | \(\le\) 4 and z(1 + i) + \(\overline z\)(1 \(-\) i) \(\ge\) \(-\)10, i = \(\sqrt { - 1}\).If the maximum value of | z + 1 |2 is \(\alpha\) + \(\beta\)\(\sqrt 2\), then the value o...

Let \(f(x) = \int\limits_0^x {{e^t}f(t)dt + {e^x}}\) be a differentiable function for all x\(\in\)R. Then f(x) equals :

For x > 0, if \(f(x) = \int\limits_1^x {{{{{\log }_e}t} \over {(1 + t)}}dt}\), then \(f(e) + f\left( {{1 \over e}} \right)\) is equal to :

If \({I_{m,n}} = \int\limits_0^1 {{x^{m - 1}}{{(1 - x)}^{n - 1}}dx}\), for m, \(n \ge 1\), and \(\int\limits_0^1 {{{{x^{m - 1}} + {x^{n - 1}}} \over {{{(1 + x)}^{m + 1}}}}} dx = \alpha {I_{m,n}}\alpha \in R\), then \(\alpha\) equals _____...

Let L be a common tangent line to the curves 4x2 + 9y2 = 36 and (2x)2 + (2y)2 = 31. Then the square of the slope of the line L is __________.

Let \(A = \{ 1,2,3,....,10\}\) and \(f:A \to A\) be defined as\(f(k) = \left\{ {\matrix{ {k + 1} & {if\,k\,is\,odd} \cr k & {if\,k\,is\,even} \cr } } \right.\)Then the number of possible functions \(g:A \to A\) such that $$gof ...

If 0 < a, b < 1, and tan\(-\)1a + tan\(-\)1b = \({\pi \over 4}\), then the value of \((a + b) - \left( {{{{a^2} + {b^2}} \over 2}} \right) + \left( {{{{a^3} + {b^3}} \over 3}} \right) - \left( {{{{a^4} + {b^4}} \over 4}} \right) + .....\) ...

Let f : R \(\to\) R be defined as \(f(x) = \left\{ \matrix{ 2\sin \left( { - {{\pi x} \over 2}} \right),if\,x < - 1 \hfill \cr |a{x^2} + x + b|,\,if - 1 \le x \le 1 \hfill \cr \sin (\pi x),\,if\,x > 1 \hfill \cr} \right.\) If f(...

Let f(x) be a differentiable function at x = a with f'(a) = 2 and f(a) = 4. Then \(\mathop {\lim }\limits_{x \to a} {{xf(a) - af(x)} \over {x - a}}\) equals :

Let \(f(x) = {\sin ^{ - 1}}x\) and \(g(x) = {{{x^2} - x - 2} \over {2{x^2} - x - 6}}\). If \(g(2) = \mathop {\lim }\limits_{x \to 2} g(x)\), then the domain of the function fog is :

Let F1(A, B, C) = (A \(\wedge\) \(\sim\) B) \(\vee\) [\(\sim\)C \(\wedge\) (A \(\vee\) B)] \(\vee\) \(\sim\) A and F2(A, B) = (A \(\vee\) B) \(\vee\) (B \(\to\) \(\sim\)A) be two logical expressions. Then :

Consider the following system of equations :x + 2y \(-\) 3z = a2x + 6y \(-\) 11z = bx \(-\) 2y + 7z = c,where a, b and c are real constants. Then the system of equations :