Questions asked by Adeeba

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• A certain negative ion #"X"^(2-)# has #18# neutrons in its nucleus and #18# electrons in its extra-nuclear structure. What is the mass number of the most abundant isotope of #"X"# ?
  
• A particle is moving with 3 times faster than speed of electron.Ratio of wavelength of particle and electron is 1.8×10^-4 then particle is?
  
• What is the frequency of limiting line in Balmer series?
  
• The moon's distance from the earth is 360000km and its diameter subtends an angle of 42' at the eye of the observer.The diameter of the moon is?
  
• If 3costheta+4sintheta=Asin(theta+alpha),then values of A and alpha are?
  
• The sum of magnitudes of two forces acting at a point is 16N.If the resultant force is 8N and its direction is perpendicular to smaller force,then the forces are?
  
• The resultant of two vectors P and Q is R.If Q is doubled then the new resultant vector is perpendicular to P.Then R is equal to?
  
• If vectors #vecA=cos(omegat)hati +sin(omegat)hatj# and #vecB=cos((omegat)/2)hati+sin((omegat)/2)hatj# are functions of time, then the value of t at which they are orthogonal to each other is?
  
• In PINUS,endosperm cells have 30 chromosomes then how many chromosomes are present in sieve cells?
  
• How many times flowering takes place in biennial plants?
  
• When a diploid female plant is crossed with a tetraploid male,the ploidy of endosperm cells in the resulting seed is?
  
• How many meiotic divisions are required for the formation of 200 seeds of Capsella?
  
• The volume of water added to 500ml,0.5M NaOH solution so that its strength becomes 10mg NaOH per ml?
  
• 100ml of 0.5N NaOH solution is added to 10ml of 3N H2SO4 solution and 20ml of 1N HCl solution.The nature of the mixture is ?
  
• The vapour pressure of a dilute aqueous solution of Glucose is 750mm of mercury at 373K. The mole fraction of solute is?
  
• 100 ml of 0.3N HCl solution is mixed with 200ml of 0.6N H2SO4 solution what is the normality of H2SO4 in the final solution?
  
• A solution of #"1.25 g"# of a non-electrolyte in #"20 g"# of water freezes at #"271.94 K"#. If #K_f = "1.86 K"cdot"m"^(-1)#, then the molecular weight of the solute is?
  
• The molarity of 98% H2SO4 (d=1.8g/ml) by weight is ?
  
• One mole of non volatile solute is dissolved in two moles of water.The vapour pressure of the solution relative to that of water is?
  
• If density of 2 molal sucrose solution is 1.4gm/ml at 25°C, find osmotic pressure?
  
• The freezing point of 1% aqueous solution of calcium nitrate will be?
  
• 18g of glucose is added to 178.2g of water.The vapour pressure of this aqueous solution at 373K is?
  
• The average osmotic pressure of human blood is 7.8bar at 310K.What is the concentration of an aqueous NaCl solution that could be used in the blood stream?
  
• 0.585% NaCl solution at 300K has osmotic pressure?
  
• Osmotic pressure of a solution containing 1g protein in 100 mL solution at 300K is 1.66 bar.What is the molecular weight of protein?
  
• Addition of 1kg of non volatile solute in volatile solvent increases the boiling point from 350K to 355K and decreases the freezing point from 250K to 220K.If Kb is 15.5KKg/mol,then Kf will be?
  
• Insulin (#("C"_2"H"_10"O"_5)_n#) is dissolved in a suitable solvent at #20^@ "C"#. The slope of a plot of osmotic pressure (#Pi#) against #c# is found to be #4.65xx10^(-3)#. The molecular weight of insulin is?
  
• A box of mass 10 kg is projected up an inclined plane from its foot with a speed of 20m/s making an angle of 37°with the horizontal.Coefficient of friction is 0.5.Find the distance travelled by the box before it stops for the first time?
  
• What will be the equilibrium constant at #127^circC#, if #K# at #27^circC# is #4# for reaction #N_2+3H_2->2NH_3#; #DeltaH=-46.06kJcolor(white)(l)mol^(-1)#?
  
• For the equilibrium, CO_(s)+CO2_(g)--->2CO_(g), Kp=63atm at 1000K.If at equilibrium Pco=10Pco2 then total pressure at equilibrium is?
  
• In Victor Mayer's method 0.2g of a volatile compound on volatilisation gave 56mL of vapour at STP.It's molecular weight is?
  
• For a first order reaction the rate constant is #1 xx 10^(-5) "s"^(-1)# having #E_a = "1800 kJ/mol"#. Then value of #ln A# at #T = "600 K"# is?
  
• How many cleavages are required for formation of 16 blastomeres?
  
• If electrode potential of 0.01M Cu^2+/Cu is 0.32V then what will be its E°_RP?
  
• E value for the cell reaction Cu|Cu^2+(0.001M)||Cu^2+(0.1M)|Cu is?
  
• Consider the cell Cu/Cu^+2||Ag^+/Ag.If the concentration of Cu^+2 and Ag^+ ions becomes ten times, the emf of the cell is?
  
• What will be the products in the following reaction?
  
• Give solubility order for:- (i)alkali metal per chlorates (ii)alkali metal bicarbonates (iii)lead (II) halides (iv)mercury (II) halides?