A. Cu
B. Cl
C. H
D. Zn
✅ The correct answer is option C.
Chemistry MCQs
The halogen having highest electron affinity is
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
✅ The correct answer is option B.
Which one is not the absolute term of the element?
A. Ionization energy
B. Electron affinity
C. Electronegativity
D. Atomic size
✅ The correct answer is option C.
Addition of urea to the soil is _________ reaction.
A. Endothermic
B. Exothermic
C. Both A and B
D. No heat energy is involved
✅ The correct answer is option B.
Which one has the maximum number of unpaired electrons?
A. 6X
B. 7Y
C. 9Z
D. 13W
✅ The correct answer is option B.
Which of the following is the most suitable catalyst for ammonia synthesis?
A. Pt
B. ZnO + Cr2O3
C. Fe in a fused mixture of Al2O3 + SiQ2 + MgO
D. All of the above
✅ The correct answer is option C.
What is the relative rate of effusion of CO and CO2?
A. CO is 1.25 times faster than CO2
B. CO is 3.75 times faster than CO2
C. CO is 1.25 times faster than CO
D. Both diffuse at the same rate
✅ The correct answer is option A.
The cooling of molten urea by air in the tower is called
A. Prilling
B. Evaporation
C. Condensation
D. Crystallization
✅ The correct answer is option A.
Which of these gases diffuse more quickly than oxygen?
A. H2S
B. NO
C. Cl2
D. N2O
✅ The correct answer is option B.
Which of the following fertilizers is not useful for paddy rice?
A. Urea
B. DAP
C. Ammonium sulphate
D. Ammonium nitrate
✅ The correct answer is option D.