List of top Questions asked in JEE Main

To maintain a speed of 80 km/h by a bus of mass 500 kg on a plane rough road for 4 km distance, the work done by the engine of the bus will be ____KJ. [The coefficient of friction between tyre of bus and road is 0.04].

Let $A = \{x \in \mathbb{R}: |x+3| + |x+4| \le 3\}$,} \[ B = \left\{ x \in \mathbb{R} : 3 \cdot \sum_{r=1}^{\infty} \frac{3^{x-3}}{10^r} < 3^{-3x} \right\}, \] where $[x]$ denotes the greatest integer function. Then,

Which of the following reaction is correct?

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid $[ A ]$ and $[ B ]$ are respectively

Reaction of $BeO$ with ammonia and hydrogen fluoride gives A which on thermal decomposition gives $BeF _2$ and $NH _4 F$ What is ' $A ^{\prime}$ ?

Order of Covalent bond:
A. $KF > KI ; LiF > KF$
B. $KF < KI ; LiF > KF$
C. $SnCl _4> SnCl _2 ; CuCl > NaCl$
D. $LiF > KF ; CuCl <NaCl$
E. $KF < KI ; CuCl > NaCl$
Choose the correct answer from the options given below:

Polymer which is named as orlon is:

Which of the following have square pyramidal structure?

If the radius of ground state hydrogen is 51 pm, find out the radius of 5th orbit of Li²⁺ ions. (closest integer)

Predict expression from α in terms of $K_{eq}$ and concentration C :

$A_2 B_3(aq) \leftrightharpoons 2{A_3} (aq)+3B_{{2-}}(aq)$

How many moles of Ba₃(PO₄)₂ will be formed by the reaction of 5 moles of BaCl₂ and 3 moles of Na₃(PO₄).

In which of the following pairs of elements electron gain enthalpy difference is highest?

A binary compound has Y-atoms forming FCC unit cell and another type of X-atoms occupying $\frac{1}{3}$^rd of tetrahedral voids. Find out the molecular formula of the compound

The value of $log_{10}K$ for a reaction A ⇋ B is

(Given,

$\Delta H^{\circ}_{298K}$ = –54.67 kJ $mol^{-1}$

$\Delta H^{\circ}_{298K}$ = 10 kJ $mol^{-1}$

and R = 8.314 J $K^{-1}mol^{-1}$

2.303 × 8.314 × 298 = 5705)

Determine the amount of urea (NH₂CONH₂) to be added in 1000 g of water to decrease its vapour pressure by 25%.

Number of ambidentate ligands in given complex [M_(en)(SCN)₄]:

2[Au(CN)₂]^– + Zn $\to$ [Zn(CN)₄]^2– + 2Au$\downarrow$ is which of these
(A) Redox reaction
(B) Displacement reaction
(C) Combination reaction
(D) Decomposition reaction

Oxidation number of Mo in Ammonophosphomolybdate

Choose the correct option.

Match the terms in Column-I with their description in Column-II and choose the correct option :

Column I		Column II
(i)	Vitamin A	a	Beri-beri
(ii)	Vitamin C (Ascorbic acid)	b	Cheilosis
(iii)	Riboflavin	c	Xerophthalmia
(iv)	Thiamine	d	Scurvy

Photochemical smog found mainly in

Match the terms in Column-I with their description in Column-II and choose the correct option:

Column I (Chemical reactions)		Column II (Enzymes used)
(i)	Glucose → CO₂+ Ethanol	a	Pepsin
(ii)	Sucrose→Glucose + Fructose	b	Diastase
(iii)	Starch →Maltose	c	Zymase
(iv)	Protein→Amino acids	d	Invertase

How many bromo products are formed when ethane is reacted with excess of Br₂ on heating?

Match the following with the correct name of reaction

Product (P) and (Q) are respectively

Reaction	Name of reaction
(I)	(P)	Gattermann Koch reaction
(II)	(Q)	Hell Volhard Zelinsky
(III)	(R)	Iodoform reaction