Questions asked by UmAir.A

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• Metal carbonates (such as: CaCO3, Na2CO3 etc) are ACIDIC in nature or BASIC? Thanks
  
• Difference between WORK and ENERGY ?
  
• What are ''fuming" acids'?
  
• Why AMMONIA GAS (NH3) is an alkali/base?
  
• Complete the EQUATION:- NaOH (aq) + Na2SO4 (s) + Al (s) ----------> ?
  
• Consider the following reaction: #CaCO_3+SO_2 to CaSO_3+CO_2#. Here #SO_2# is oxidized to #CaSO_3#, so is #SO_2# a reducing agent or oxidizing agent? Kindly give your reason.
  
• The least common multiple of 84 and N is 504. How to find " N " ?
  
• Are group2 HYDROXIDES soluble or not ?
  
• Are OXIDANTS and OXIDIZING AGENTS the same thing?
  
• Is Cu(OH)2 soluble in an excess of NaOH ?
  
• Why doesn't barium nitrate react with sulfuric acid?
  
• Who are responsible for conduction of electricity in an iconic compound (molten form), the ions or the free electrons?
  
• How do we hold objects (such as keys, books or anything else) if we have never touched anything?
  
• Are reduction reactions always endothermic?
  
• Are oxidation reactions always exothermic?
  
• A chemist performs the synthesis of sodium chloride from its elements. The chemist begins with 46 grams of sodium. How many moles of chlorine are needed? 2 Na + Cl2 → 2 NaCl
  
• In the formation of carbon dioxide from carbon monoxide and oxygen, how many liters of carbon monoxide, CO, are needed to react completely with 1/2 mole of oxygen gas at STP? 2 CO (g) + O2(g) → 2 CO2 (g)
  
• ( In a tube ) why CO2 gas doesn't sinks (gets below) , displacing the water to be on the top, If carbon dioxide (44 g/mol) has more molar mass than water( 17 g/mol)? Is it just because water is a liquid and co2 is a gas or there are some other factors?
  
• How this reaction (during qualitative analysis) is possible: #Zn^(2+)# + NaOH ------> #Zn(OH)2# + #Na^(2+)# if Zinc is below Sodium in the reactivity series?
  
• Refractive index = #sin i/sin r# or #sin r/sin i#. what does it tell? and ABOUT WHAT?
  
• Sketch the graph of pV vs p when the temperature of the gas is constant. here p means pressure and V means volume - showing you the direct relationship b/w p and V (by using pV). how to sketch it???
  
• What is infrared radiation?
  
• What is a pitch (in sound)?
  
• Refer to the image. I think the answer is D. Right or wrong?
  
• A thin converging lens is used to focus the rays from the #Sun# on to the piece of paper. when the rays burn a hole on the paper, the distance between the lens and the paper is __________ the focal length of the lens. { options are;- } ??
  
• A converging lens is used to project a 250 mm image of a square slide onto a screen 1000 mm away. the focal length of the lens is 200 mm. by means of scale drawing, determine---(a) the distance of the slide from the lens----(b) the size of the slide???
  
• A bus driver has the centre of a 20 cm wide plain mirror placed 50 cm in front of him. if the rear of the bus is 500 cm directly behind the plain mirror, how wide id the field of vision of the bus driver whenever he looks into the mirror while driving?
  
• Please refer to the image here. ?
  
• WHICH one is the strong compound, the one which transfers or shares more electrons # "OR" # the one which transfers or share less electrons?
  
• What is an #"ebonite rod"# ?
  
• Where does the light go when we switch off the light bulb?
  
• When two gases have same number of moles then they also have same number of molecules. Is it correct?
  
• Is angle of elevation always measured from the HORIZONTAL AXIS?
  
• Is angle of elevation always measured from the HORIZONTAL AXIS?
  
• Clad or Clothed? which one to use?
  
• See the image below..?
  
• Ductile metal means it can be stretched into wired. So is it also correct to say that MORE DUCTILE means MORE ELASTICITY?
  
• Why Diamond has higher melting point than Silicon Carbide?
  
• Entice or Incite ? Are they same or different?
  
• If a vector #vec (SQ)# = #vec (QS)# then what does it mean?
  
• Which option is correct ..??
  
• Do isomers have weak covalent bonds as compared to normal hydrocarbons (alkanes)?
  
• Which of these is not an isomer of (the straight-chained) #"C"_6"H"_14# (hexane)?
  
• More reactive the metal, lesser the melting it has. Right?
  
• Refer to the question below.......please give solid explanation for the answer......?
  
• See the image below....please explain your answer?
  
• Refer to the image below and also give explanation for your answer...?
  
• Why a rectangle has 2 lines of symmetry and not 4 ?
  
• An insulated beaker contains 300 g of water at #30^o C #. Water at #100^o C# is added until the temperature of the mixture reaches #50^o C#. The specific heat capacity of water is 4.2 J/#(g^o C)#. How much water is added?
  
• Integrate #x/(x^2+2)^2# ?
  
• Integers a and b are such that #(a + 3sqrt(5))^2# + #a - b sqrt(5)# = 51. Find the possible values of a and corresponding values of b....?
  
• Can we write it like this?
  
• Integrate #xe^(4x)# ?
  
• The triangle A with coordinates (3,2) (5,4) (7,4) can be mapped on to triangle D with a transformation matrix P. Find coordinates of D?
  
• The diagram shows the magnetic field around wire X which carries current into the paper....?
  
• Answer this MCQ...?
  
• What is the specific latent heat for ice?....Take a look at details below..?
  
• To which substance is dilute sulfuric acid added to prepare lead(II) sulfate?
  
• Is this Hydrocarbon saturated or not?
  
• Arrange "four" cells of 1.5 V each in such a way that total emf is 3V....?
  
• In a circuit which has a DC power supply, a metal filament lamp and an ammeter connected. Does dividing by 2 the EMF of the DC power supply also halves the current?
  
• Find the number of sides of polygon if...? All the angle of a polygon are either #155^o# or #140^o#. There are twice as many angles of #155^o# as #140^o#.
  
• Find the matrix X such that XA=B ..?
  
• How will you answer this?
  
• While writing a narrative essay can I travel with time?
  
• Dainty or daintily? Whats the difference? Give sentences using these words as examples.
  
• All external forces on the body cancel out. Which statement must be correct?
  
• If a parachutist free falls, assuming he reaches terminal velocity, what is the force with which he hits the ground if he fails to open parachute?
  
• How does the air resistance affects the graph of a free falling body?
  
• An airplane travels at an average speed of 600 m/s on an outward flight and 400 m/s on the return flight over the same distance. What's is the average speed of the whole flight?
  
• Explain the difference between polarity and electronegativity?
  
• Which of the following least resembles an ideal gas?
  
• Please help with this MCQ?
  
• Identify the compounds in this MCQ.?
  
• Which of these statements is correct?
  
• Current Electricity MCQ below?
  
• Which of the following substances has incomplete outer shell?
  
• Which reaction takes place at anode?
  
• Which energy change corresponds to the enthalpy change of atomization of #H_2# at 298 K ?
  
• Total resistance of the circuit ?
  
• Which of the underlined substance is acting as a base?
  
• How does change in concentration at equilibrium affects the value of #K_C# (equilibrium constant)?