#jee-2021
- The period of oscillation of a simple pendulum is T = 2π\sqrt{Lg}. Measured value of 'L' is 1.0 m from meter Answer: (1) 1.13% Step 1: Write g in terms of the measured quantities. T = 2π√(L/g) ⇒ g = frac4π²LT² Step 2: Relative error. For a product o... 1
- Which of the following reaction DOES NOT involve Hoffmann bromamide degradation ? The correct answer is option 3) This reaction does not involve haffmann bromanide degradation Rest all options involve haffmann bromamide de... 1
- Which among the following pairs of Vitamins is stored in our body relatively for longer duration ? (2) Vitamin A and Vitamin D 2
- In chromatography technique, the purification of compound is independent of : Correct answer is option (2) Physical state of the pure compound In chromotography technique, the purification of a compound is independent... 1
- Which of the following is Lindlar catalyst ? (1) Cold dilute solution of KMnO4 (2) Partially deactivated palladised charcoal 2
- According to molecular orbital theory, the species among the following that does not exist is: The correct answer is d) Be₂ According to M.O.T. If bond order of chemical species is zero then that chemical species does not exist Chemica... 1
- In Young’s double-slit experiment, the width of one of the slits is three times the other slit. The correct answer is a) 4:1 Explaination :: A₂=3A₁ Amplitude ∝ width space of space slit I_max = (A₁ + 3A₁)^(2 ) ..............1 and I_min... 1
- Ceric ammonium nitrate and CHCl3/alc. KOH are used for the identification of functional groups The correct answer is option A) Alcohol and amine Solution : Ceric ammonium nitrate and CHCl₃/alc. KOH are used for the identification of fu... 1
- Calgon is used for water treatment. Which of the following statements is NOT true about Calgon? The correct answer is opion A) Calgon contains the 2ⁿd most abundant element by weight in the earth's crust EXplaination :: Order of abundan... 1