Equilibrium

JEE Main 2025 (Online) 23rd January Evening ShiftMCQEasy📈 Topic in 3% papers+4−1

Ques. 1JEE Main 2025, 23 January (Evening Shift)

pH of water is 7 at 25 C. If water is heated to 80 C, it's pH will :

Decrease
Remains the same
Increase
H+ concentration increases, OH- concentration decreases

Answer

(1) Decrease

Solution

H2O H+ + OH-, H > 0 ⇒ heating raises Kw (10-14 2.5 10-13)

⇒ [H+]= Kw increases ⇒ pH falls (about 6.3); water stays neutral

Answer: (1)

Keep practising — Equilibrium

Ques. 2JEE Main 2025, 23 January (Evening Shift)

Consider the reaction X2Y(g) X2(g) + 12Y2(g) The equation representing correct relationship between the degree of dissociation (x) of X2Y(g) with its equilibrium constant Kp is . Assume x to be very very small.

x = [3] KpP
x = [3] Kp2P
x = [3] 2 Kp2P
x = [3] 2KpP

Ques. 3JEE Main 2025, 22 January (Morning Shift)

A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of CO2 is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm, then Kp is :

0.18 atm
0.3 atm
3 atm
1.8 atm

Ques. 4JEE Main 2025, 22 January (Evening Shift)

The molar solubility(s) of zirconium phosphate with molecular formula ( Zr4+ )3 ( PO43- )4 is given by relation :

( Ksp5348 )1/6
( Ksp8435 )1/7
( Ksp6912 )1/7
( Ksp9612 )1/3

All Equilibrium PYQs →

PDFDownload Equilibrium PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇

All JEE Main Chemistry chapters

Physical ChemistrySome Basic Concepts of Chemistry Structure of Atom States of Matter Thermodynamics Equilibrium Redox Reactions Solutions Electrochemistry Chemical Kinetics

Inorganic ChemistryClassification of Elements and Periodicity in Properties Chemical Bonding and Molecular Structure p-Block Elements (Group 13 & 14)p-Block Elements (Group 15–18)d- and f-Block Elements Coordination Compounds

Organic ChemistryOrganic Chemistry – Some Basic Principles and Techniques Isomerism Hydrocarbons Haloalkanes and Haloarenes Alcohols, Phenols and Ethers Aldehydes, Ketones and Carboxylic Acids Amines Biomolecules Principles Related to Practical Chemistry