List of top Chemistry Questions on Chemical Reactions asked in JEE Main

Consider the following reaction sequence: \([CaCl_2 + Na_2CO_3 → X+Y] → Z\)

When 2 gm magnesium reasts with excess of HCl and H2 gas is produced then the volume of H2 gas produced is ____ × 10–2 liter at STP. (Nearest Integer)

Major product 'P' formed in the following reaction is:
Major product 'P' formed in the following reaction is:
The statement/s which are true about antagonists from the following is/are:
A. They bind to the receptor site.
B. Get transferred inside the cell for their action.
C. Inhibit the natural communication of the body.
D. Mimic the natural messenger.
Choose the correct answer from the options given below:

Formation of photochemical smog involves the following reaction in which A, B, and C are respectively:
\(\text{NO}_2 \xrightarrow{h\nu} \text{A} + \text{B}\)
\(\text{B} + \text{O}_2 \rightarrow \text{C}\)
\(\text{A} + \text{C} \rightarrow \text{NO}_2 + \text{O}_2\)
Choose the correct answer from the options given below:

The correct reaction profile diagram for a positive catalyst reaction .
In Hall - Heroult process, the following is used for reducing Al2O3 :-
The product (P) formed from the following multistep reaction is:
The product (P) formed from the following multistep
Coagulating value of the electrolytes AlCl3 and NaCl for As2S3 are 0.09 and 50.04 respectively. The coagulating power of AlCl3 is x times the coagulating power of NaCl. The value of x is ______ .
In the following reactions, the total number of oxygen atoms in X and Y is _______
Na2O + H2O → 2X
Cl2O7 + H2O → 2Y
Incorrect method of preparation for alcohols from the following is:
Buna-S can be represented as:
The reaction used for preparation of soap from fat is :
\(A(g) ⇋ 2B(g) + C(g)\)
For the given reaction, if the initial pressure is 450 mm Hg and the pressure at time t is 720 mm Hg at a constant temperature T and constant volume V. The fraction of A(g) decomposed under these conditions is \(x × 10^{–1}\). The value of x is _____ . (nearest integer)
In the reaction given below :
The Product X is:
The Product ‘X’ is:
During water-gas shift reaction
A' formed in the above reaction is
A' formed in the above reaction is
What is the major product of the following Friedel-Crafts alkylation of chlorobenzene is
correct sequence of reagents to be added is
In the above conversion the correct sequence of reagents to be added is
The Product formed in the following multistep reaction is
Consider the following sequence of reactions:
Consider the following sequence of reactions:
The product 'B' is
For a reversible reaction A ⇌ B, the ΔHforward reaction = 20 kJ mol-1. The activation energy of the uncatalysed forward reaction is 300 kJ mol-1. When the reaction is catalysed keeping the reactant concentration same, the rate of the catalysed forward reaction at 27°C is found to be same as that of the uncatalysed reaction at 327°C. The activation energy of the cataysed backward reactoion is ____ kJ mol-1.
In base vs acid titration, at the endpoint methyl orange is present as

For the decomposition of azomethane, CH3N2CH3(g) → CH3CH3(g) + N2(g), a first-order reaction, the variation in partial pressure with time at 600 K is given as
The half-life of the reaction is ______ × 10–5s. [Nearest integer]

In the above reaction product B is:
In the above reaction product B is:
Product B is