Posts by marjani

Total # Posts: 17

  1. chemistry

    a radioactive material is undergoing nuclear decay. After 40 minutes, 25% of the sample remains. What is the half-life of the sample
  2. chemistry

    an ideal gas in a closed inflexible container has a pressure of 6 atms and a temperature of 27 degree c. What will be the new pressure of gas of temperature is decreased to -73 degree c. 1) 2atm 2) 3atm 3) 4atm 4) 8atm 5) 9atm
  3. chemistry

    h2+I2 <-------> is independent of ? 1) temperature 2) concentration 3) catalyst 4) pressure 5) reactants
  4. chemistry

    nitrobenzene + hono2 on dilution with h2so4 gives ?
  5. chemistry

    a reaction which is endothermic in one direction is 1) endothermic in reverse direction 2) exothermic in reverse direction
  6. chemistry

    when the wavelength of a photon of light is reduced its momentum is 1) increased 2) decreased 3) not changed
  7. chemistry

    when the wavelength of a photon of light is reduced its momentum is 1) increased 2) decreased 3) not changed
  8. chemistry

    bond angle and hybridisation of oxygen in water is ?
  9. chemistry

    which of the following correctly compare the rate of diffusion of oxygen to that of hydrogen 1) 1:4 2) 4:1 3) 16:1
  10. chemistry

    in which location, would the boiling piont of water will be highest ? A) new mexico where pressure is 710torr B) new york city where pressure is 760torr C) mount everest where pressure is 244torr D) a pressure cooker where pressure is 760torr
  11. chemistry

    a compound used to manufacture mustard gas is ?
  12. chemistry

    statement that is wrong about transition elements is 1) they have fixed oxidation states 2) they show paramagnetic behavior 3) they form interstitial compounds 4) they form complexes
  13. chemistry

    an example of a transition element having completely filled d-orbital is zn Ti v Cr
  14. chemistry

    how to calculate neutrons in 99Tc43
  15. chemistry

    if k>>1 ? Choose the correct answer 1) the equilibrium mix. Will favour product over reactants 2) the equilibrium mix. Will favour reactants over products 3) the equilibrium amounts of reactants and products are equal 4) the reaction is irreversible
  16. chemistry

    four grams of he are in a sealed, 2l container. If he were a true ideal gas, how would its behaviour differ from its actual behavior
  17. chemistry

    four grams of he are in a sealed, 2l container. If he were a true ideal gas, how would its behaviour differ from its actual behavior