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  1. D

    Chemistry and Physics AS paper 12 MCQS

    When equal volumes of saturated solutions of barium hydroxide and calcium hydroxide are mixed, a white precipitate, Y, forms. The mixture is filtered and carbon dioxide is bubbled through the filtrate, producing a second white precipitate, Z. What are Y and Z? Y Z A Ba(OH)2 Ca(OH)2 B...
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    Chemistry and Physics AS paper 12 MCQS

    student investigates four different fuels. Each fuel is used separately to raise the temperature of 1 dm3 of water from 20°C to 100°C. Each fuel undergoes complete combustion. All other conditions are the same in each experiment. Which fuel would produce the smallest amount of carbon dioxide in...
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    Chemistry and Physics AS paper 12 MCQS

    In which species does the underlined atom have an incomplete outer shell? A Al 2Cl 6 B CH3+ C Cl 2O D H2Cl C•
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    Chemistry: Post your doubts here!

    6 A substance commonly found in the house or garden has the following properties. • It is combustible. • It is an electrical insulator. • It melts over a range of temperature. What could the substance be? A brass B paper C poly(ethene) D silicon(IV) oxide Ans is C
  5. D

    Chemistry: Post your doubts here!

    plz helppp
  6. D

    Chemistry: Post your doubts here!

    It can form only coordination 4 which shows cis trans isomer . For cis chlorine should be 90 degree to each other while for trans both chlorine should be 180 degree to each other . Chorine placed anywhere other then 180 degree will only have 90 degree because all four are on same plane. Not to...
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    Physics: Post your doubts here!

    One possible nuclear fission reaction is 235 1 U + 092 n 141 1 56 0 Ba + 92 36 Kr + 3 n + energy. Barium-141 (141 56 Ba) and krypton-92 (92 36 Kr) are both β-emitters. Barium-141 has a half-life of 18 minutes and a decay constant of 6.4 × 10–4 s–1. The half-life of krypton-92 is 3.0 seconds...
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    Chemistry: Post your doubts here!

    Ans :21/9
  9. D

    Sharing my CIE A-level Chemistry notes [AS chapters completed]

    Ans : 21/9 how?
  10. D

    Physics: Post your doubts here!

    STRESS= FORCE/AREA Stress (wide) =F/[d^2] Stress (narrow)= F/[(d/2)^2] F and d^2 will cancel out each other by substituting them. StressW/StressN= [1]/[4] =0.25
  11. D

    ASK BIOLOGY DOUBTS HERE!!!!

    15. A Why is it not C?
  12. D

    Physics: Post your doubts here!

    34. C
  13. D

    Physics: Post your doubts here!

    A loaded aeroplane has a total mass of 1.2x10^5 kg while climbing after take off. It climbs at an agle 23 degree to horizontal with a speed of 50 m/s. what is the rate at which it is gaining potential energy at this time? ans: 2.3x10^7
  14. D

    Physics: Post your doubts here!

    Thankyou :)
  15. D

    Physics: Post your doubts here!

    Ans = D How??
  16. D

    A level Biology: Post your doubts here!

    24 In an animal cell, which process is dependent upon cell surface area and which process is dependent upon cell volume? cell surface area cell volume A carbon dioxide produced oxygen used B glucose absorbed hormones detected C...
  17. D

    Physics: Post your doubts here!

    A pile driver supported by a crane is used to drive a vertical steel girder of mass 900kg into the ground. The pile driver has an 80g steel 'hammer' which is raised 4.0m above the top end of the girder then released to strike the end of the girder and drive it further into the ground. Each...
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    Physics: Post your doubts here!

    A certain organ pipe, closed at one end, can resonate at consecutive frequencies of 640 Hz, 896 Hz, and 1152 Hz. Deduce its fundamental frequency.
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    Physics: Post your doubts here!

    Q19. Ans=C
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    A2 Biology | Post your doubts here

    Which changes to the water potential and the volume of liquid in the phloem occur when carbohydrate is taken out of a sink into a phloem sieve tube element? There are different mcqs with different situations . Can anybody tell me the concept. Q23.
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