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JEE Main Unit 4A1: Types of Chemical Reactions — practice questions — page 2

Explore 48 free Unit 4A1: Types of Chemical Reactions questions in JEE Main Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 4A1: Types of Chemical Reactions questions and exercises with answers

Showing questions 31–48 of 48.

The dimensions of Planck's constant are same as that of:Read the answer and worked solution →If force (F), velocity (V) and time (T) are taken as fundamental quantities, then the dimensions of mass are:Read the answer and worked solution →The percentage errors in the measurement of mass and speed are 2% and 3% respectively. The maximum percentage error in kinetic energy is:Read the answer and worked solution →Tap the alkali metals on the periodic table.Read the answer and worked solution →Tap the noble gases on the periodic table.Read the answer and worked solution →Sort each molecule to Polar or Non-polar.Read the answer and worked solution →Flip pairs — match element to atomic number.Read the answer and worked solution →Sort each half-reaction as Oxidation or Reduction.Read the answer and worked solution →Pop only the strong acids.Read the answer and worked solution →Type the chemical symbol for each element.Read the answer and worked solution →Continue the IUPAC alkane series.Read the answer and worked solution →Pop only the ionic compounds.Read the answer and worked solution →Match each gas law to its statement.Read the answer and worked solution →Match each gas law to its statement.Read the answer and worked solution →Balance the Haber synthesis of ammonia.Read the answer and worked solution →Balance the combustion of ethane.Read the answer and worked solution →Number of moles formula.Read the answer and worked solution →pH definition.Read the answer and worked solution →

Worked practice questions

The dimensions of Planck's constant are same as that of:

  1. Angular momentum
  2. Linear momentum
  3. Energy
  4. Power
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Correct answer: A. Angular momentum

Planck's constant $h$ has dimensions of energy $\times$ time: $[ML^2T^{-2}]\,[T]=[ML^2T^{-1}]$. Angular momentum also has dimensions $[ML^2T^{-1}]$.

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If force (F), velocity (V) and time (T) are taken as fundamental quantities, then the dimensions of mass are:

  1. [F V⁻¹ T]
  2. [F V T⁻¹]
  3. [F V⁻¹ T⁻¹]
  4. [F Vᵃ T]
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Correct answer: A. [F V⁻¹ T]

Using $F=ma$, we get $m=F/a$. Since acceleration has dimensions $[VT^{-1}]$, mass has dimensions $[F][V^{-1}T]$. **Hence option A is correct.**

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The percentage errors in the measurement of mass and speed are 2% and 3% respectively. The maximum percentage error in kinetic energy is:

  1. 5%
  2. 8%
  3. 11%
  4. 14%
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Correct answer: B. 8%

Kinetic energy $K=\frac{1}{2}mv^2$. For products and powers, maximum percentage errors add with their powers: $\frac{\Delta K}{K}\times100 = 2\% + 2\times 3\% = 8\%$.

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