WBJEE Chemistry Answer Key 2025: Unoffcial Key PDF

Questions

Answers

Q1) Arrange compounds in order of their increasing acid strength 

C) 'I < IV < II< III'

Q2) The number of lone pairs of electrons and the hybridization of Xenon(Xe) in XeOF₂ are

D) 2,sp³d

Q3) the coagulating power of electrolytes having ions Na⁺, AI³⁺ and Ba²⁺ for AS_2S3sol increases in the order

B) NA + < BA²⁺< AI³⁺

Q4) The number of terminal and bridging hydrogens in B₂H₆ is respectively

A) 4 and 2

Q5) As per the following equation, 0.217g of HgO(molecular mass = 217 g mol^-1) reacts with excess iodide. On titration of the resulting solution, how many mL of 0-01 M HCl is required to reach the equivalence point?HgO+4l+H₂O

B) 200 mL

Q6) An egg takes 4 minutes to boil at sea level, where the boiling point is T1K, whereas it takes 8 minutes to boil on a mountain top where the boiling of water is T2K. The activation of energy for the reaction takes place during the boiling of egg is

D)0-693RT₁T₂/T₁-T₂

Q7) Which pair of ions can be separated by the precipitation method?

A, C, and D

Q8) X is an extensive property, and x is an intensive property of a thermodynamic system. Which of the following statements is correct

A) and B)

Q9) The bond order HeH⁺ is

A) 1

Q10) 630 cm³ of a hydrocarbon diffuses in 30 minutes, while under the same conditions, 360 cm³ of So₂ gas diffuses in one hour. The molecular form of the hydrocarbon

A) CH₄

Q11) X is an extensive property, and x is an intensive property of a thermodynamic system. Which of the following statements is/are true

xX is extensive