The de Broglie wavelength of an electron moving with kinetic energy 4.55 × 10⁻²⁵ J is: (mₑ = 9.1 × 10⁻³¹ kg)
A728.6 nm
B364.3 nm
C145.7 nm
D1457 nm
NEETChemistry
Given bond enthalpies: H-H = 436 kJ mol⁻¹, Cl-Cl = 242 kJ mol⁻¹, H-Cl = 432 kJ mol⁻¹. The enthalpy change for H₂(g) + Cl₂(g) → 2HCl(g) is:
A-186 kJ mol⁻¹
B+186 kJ mol⁻¹
C-244 kJ mol⁻¹
D+244 kJ mol⁻¹
Class 12Chemistry
The most stable oxidation state of d⁴ transition metal ion is:
A+4
B+2
C+3
D+5
Class 12Chemistry
Which of the following statements is correct about the reaction of glucose with HI for a long time?
AIt gives n-hexane
BIt forms glucosone
CIt forms saccharic acid
DIt forms methyl glucose
JEE MainChemistry
Which of the following methods is used for the purification of metals that are volatile and form volatile compounds with available reagents?
AEllingham method
BMond process
CZone refining
Dvan Arkel method
NEETChemistry
An ideal gas expands isothermally and reversibly from 1 L to 10 L at 300 K. The work done by the gas is (R = 8.314 J/mol·K):
A-5.75 kJ
B+5.75 kJ
C-8.314 kJ
D+8.314 kJ
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Chemistry covers organic, inorganic, and physical chemistry topics including chemical bonding, reaction mechanisms, stoichiometry, electrochemistry, thermodynamics, acids and bases, organic compounds, and biomolecules. Practice with targeted chemistry questions designed to improve conceptual understanding and numerical problem-solving for engineering and medical entrance examinations.
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