Questions asked by Shamila

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• Calculate the volume of ammonia gas produced at STP when 140g of nitrogen gas reacts with 30g of hydrogen gas.(atomic mass: N=14u,H=1u) how to do this?
  
• Calculate the wavelength of the first line in lyman series of the hydrogen spectrum (R = 109677 cm-1) how to do this?
  
• First member of a group differs from the rest of the members of the same group. Why?
  
• A photon has a wavelength of 3.5 A0. Calculate its mass. (Planck's constant, h = 6.626 x 10-34 Js. Velocity of light = 3 x 108 m/s) What is de answer?
  
• An organic compound has the following percentage composition C = 12.36%, H = 2.13%, Br = 85%. Its vapour density is 94. what is its molecular formula?
  
• Critical temperature for CO2 and CH4 are 31.1º and 81.9º C respectively. Which of these has stronger intermolecular forces and why ?
  
• A platinum resistance thermometer has resistance 2.2 Ω at 0°C and 5.6 Ω at 100°C. If its resistance is 7.3 Ω in a bath, find the temperature of the bath on the platinum resistance thermometer?
  
• It is required to prepare a steel meter scale, such that the mm intervals are to be accurate within 0.0005mm at a certain temperature. Determine the max. temp. variation allowable during the rulings of mm marks? Given α for steel = 1.322 x 10-5 0C-1
  
• Three balls of masses 1, 2 and 3 kg respectively are arranged at the corners of an equilateral triangle of side 1m. What will be the M. I. Of the system about an axis through the centroid and perpendicular to the plane of triangle?