Questions asked by Jaspreet Kaur

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• How does Taenia solium perform self fertilization during sexual reproduction even when protandrous condition exists?
  
• What is the total number of #AlF_3# molecules in a sample of #AlF_3# containing #3.01 * 10^(23)# fluoride ions ?
  
• 5.85 g of NaCl is dissolved in 1 L of pure water . How do you calculate the number of ions in 1mL of this solution?
  
• Ratio of Cp and Cv of a gas 'X' is 1.4. Calculate the number of atoms of the gas present in 11.2 liters of it at NTP?
  
• Alveoli are lined by squamous epithelial cell layer. Epithelial cells are essentially avascular. Thus, how does the blood in the body get oxygenated via alveoli?
  
• What causes ringworm ? What's it's span in the host body ?
  
• Why viroids and virusoids do not cause diseases in animals ?
  
• The degree of dissociation of #"Ca"("NO"_3)_2# in a dilute aqueous solution containing 14g of the salt per 200 g of water at #100^@"C"# is 70% .If the vapour pressure of water is 760 mmHg , what will be the vapour pressure of the solution ?
  
• A sample of drinking water severely contaminated with chloroform , CHCl3 ,is supposed to be carcinogenic in nature . The level of combination was 15 ppm (by mass) .What is the molality of chloroform in the water sample ?
  
• Equimolal solutions of #"KCl"# and compound #"X"# in #"H"_2"O"# show depressions of freezing pts. in a #4:1# ratio . Assuming #"KCl"# to be ionized completely , the compound #"X"# must ?
  
• For the reactions, H2(g)+Cl2(g)----->2HCl(g)+xKJ H2(g)+Cl2(g)----->2HCl(l)+yKJ Which one of the following statement is correct? A)x>y B)x<y C)x=y D)more data required
  
• 9.2g of dinitrogen tetroxide is taken in a closed 1L vessel and heated till the following equilibrium is reached. At equilibrium, #50%# of the #"N"_2"O"_4(g)# is dissociated. What is the equilibrium constant (in mol/liter) ?
  
• A vessel at 1000K contains #"CO"_2# with a pressure of 0.5atm. Some of the #"CO"_2# is converted into #"CO"# on the addition of graphite. If the total pressure at equilibrium is 0.8atm, the value of #K_p# is?
  
• In the Haber process, #"30 L"# of #"H"_2# and #"30 L"# of #"N"_2# were used for a reaction which yielded only #50%# of the expected product. What will be the composition of gaseous mixture under these condition in the end?
  
• When an important predator starfish 'Piasater' was experimentally removed from an enclosed idertidal area of communities of the American Pacific coast, it resulted in extinction of +10 species of invertebrates with in a year? why?
  
• Weight of 50 atoms of an element is 3000 a.m.u. Calculate the number of atoms in 240 grams of element?
  
• In the preparation of CaO from CaCO3 using the equilibrium, CaCO3(s) <------> CaO(s) + CO2(g) Log Kp = 7.282- 8500/T For complete decomposition of CaCO3, the temperature in Celsius is ? A) 1167 B) 894 C) 8500 D) 850
  
• CsBr crystallises in a body-centred cubic (bcc) lattice. The unit cell lengt is 436.6pm. Given that the atomic mass of Cs= 133u and that of Br=80u. What will be the density of CsBr? a) 0.425g/cm^3 b) 8.25g/cm^3 c) 42.5g/cm^3 d) 4.25g/cm^3
  
• What will be the pH of the solution that results from the addition of 20mL of 0.01M Ca(OH)2 to 30mL of 0.01M HCl?
  
• A copper rod is suspended in a non-homogeneous magnetic field region. How will it align itself in equilibrium?
  
• A railway track running N-S has 2 parallel rails 1m apart. If the horizontal component of magnetic field​ at that place is 0.3*10^-4 and angle of dip is 60°, then what'll be the value of induced emf b/w the rails when a train passes at a speed of 90km/ h?
  
• A 15g ball is shot from a spring gun whose spring has force constant of 600N/m. The spring is compressed by 5cm. What is the greatest possible horizontal range of the ball for this compression is (take g=10m/s^2)?
  
• How to calculate oxidation number of Iron in ferriferrocyanide Fe4[Fe(CN)6]3 ?
  
• How should the diameter of the wire used be chosen so to minimize the heat dissipated in windings ? Check the details in question.
  
• How many litres of liquid CCl4 ( d=1.5 g/cc) must be measured out to contain 10^25 CCl4 molecules?