57 public questions tagged with this topic.
t₉₉ / t½ ≈ 6.64 ≈ 7.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Temperature Dependence - Arrhenius Equation and Activation Energy
x = 0.8, pA = 1.2. k ≈ 0.00675 s⁻¹.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Temperature Dependence - Arrhenius Equation and Activation Energy
3 half-lives → % decomposed = 87.5%.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Temperature Dependence - Arrhenius Equation and Activation Energy
3 half-lives → fraction remaining = 1/8 = 12.5%.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Temperature Dependence - Arrhenius Equation and Activation Energy
t = (2.303/0.0139) log(1/0.4) ≈ 66 min.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
t½ = 0.693/0.0289 ≈ 24 min.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
For A → 2B, x = 0.5, pA = 0.5. k ≈ 0.0139 s⁻¹.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
log([R]₀/[R]) = kt/2.303 = (0.0115×60)/2.303 ≈ 0.301 → [R]₀/[R] ≈ 2 → % remaining = 50%.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
For A → B + C, x = 0.5 atm, pA = 1.5 atm. k = (2.303/20) log(2.0/1.5) ≈ 0.0203 s⁻¹.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
log([R]₀/[R]) = kt/2.303 = (0.0346×40)/2.303 ≈ 0.602 → [R]₀/[R] ≈ 4. Fraction remaining = 0.25 → % decomposed = 75%.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
70% completion means 30% remains, [R]/[R]₀ = 0.3, [R]₀/[R] ≈ 3.333. t = (2.303/0.0115) log 3.333 ≈ 105 min.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Rate of Reaction - Average and Instantaneous Rate and Rate Law
k = (2.303/15) log(1/0.75) ≈ 0.0192 min⁻¹.
Ref: NCERT Class 12 Chemistry > Chapter 3: Chemical Kinetics > Topic: Pseudo First Order and Complex Reactions
