CHEMISTRY OBJ:
1-10 ACBACDCCAB
11-20 CCAAECADBC
21-30 ECAEBBDADC
31-40 CABEBCABBE
41-50 ABCBAABDEB
51-60 CEEEECEBDC
1ai)i)water is testeless,colourless and odourlessii)the boiling point of water is 100'C
1aii)Na2SO4=(23*2+32*1+16*4)=46+32+64=132gNa2 and O4=46+64=100g%mass=100/sqr32*100 = 10000/132=75.76%
1aiii)i)aluminium
1aiv)i)alumina
1b)I = (A) Is2 , 2s2 ,2p2 ( Carbon)II= (B) Is2 , 2s2, 2p4 (Oxygen )III=(C) Is2, 2s2, 2p6 ( Neon)IV=(D) Is2 ,2s2, 2p6, 3s2 ( Magnessium )V=(E) Is2, 2s2, 2p6, 3s2, 3p5 (Chlorine)
1bi)Element in Group Iv = A (Carbon)Elements in S-block = D (Magnessium)Element C not participate in chemical RxnElement E Readily Ionize & gain one electronElements B & D contain Two unpaired Electron
1bii)Standard solution of a solute at a particular temperature is one which containing as much solution as it can dissolve at that termperature in the presence of undissoved solute particles
1biii)dilute solution contains small amount of solute while concentratated solution contains large amount of solute
1ci)i)manosaccharidesii)disaccharidesiii)polysaccharides
1cii)CLICK HERE FOR THE IMAGE
1ciii)insert a glowing splinter into the unknown gas the rekindling of the glowing splinter indicates the presence of oxygen
4ai)i)addition of sodaii)addition of zeolite
4aii)the solubility of KCl increase at a constant rate with the rise in temperature while the solubility of NaCl is independent of temperature
4aiii)PH of a solution is measure of the molar concentration of hydrogen ions in the solution
4aiv)i)A is most acidicii) E is most basiciii) C is neutral
4bi)i)gases are made up of molecules which are in constant random motionii)the particles do not attract each otheriii)during motion the molecules of the gas collides with one another and with the wallss of container
4bii)given thatP1=320MMHgP2=760MMHgV1=220Cm^3V2=?T1=22degreeT2=100degreeusing P1V1/T1=P2V2/T2V2=320*220*100/22*760V2=7040000/16720V2=421.05cm^3
4ci)DaigramCLICK HERE FOR THE IMAGE
4cii)i)it is used for respirationii)it is used in industries for removal of carbon sulphur and impurities in pig ironiii)oxygen is used as propelants in space rocket.
2ai)
oxidation is a process involving a loss of electron(s), Reduction is a process in which an electronagetive element loses electron while an electropositive element gains electron.
2aii)
i)nitrogen is colourless,ordourless and testsless gas
ii)it is slightly soluble in water
2aiii)
x is (NH2)2 CO
y is H20
2bi)
i)element-chlorine
E/configuration=1s^2, 2s^2, 2p^6 3s^2, 3p^5 atomic number is 9
ii)NaOH=(23*1+16*1+1*1)
=23+16+1=40g
avogrado's constant=6.02*10^23
5g=5/40*6.02*10^23
=6.02*10^23=0.753*10^23
=7.53*10^22moles
iii)fractional abundance
=1/3 and 2/3
=1/3 * 18 + 2/3 * 20
=18/3+40/3=58/3
=19.33g
2ci)
faraday's second law of electrolysis states “When the same quantity of electricity is passed through different electrolytes, the masses of different ions liberated at the electrodes are directly proportional to their chemical equivalents (Equivalent weights).
2cii)
the single line represents one electron while double bonds represent two electrons
2ciii)
polymerization is any process in which relatively small molecules, called monomers, combine chemically to produce a very large chainlike or network molecule, called a polymer.
2civ)
i)it is used for making wine,beer,etc
ii)it is used as fuel
iii)it is used as preservative and steriling liquids
iv)it used for making anti-freeze reagents in automobile radiators
6ai)
I)solution A is starch solution, sample B is Iodine
II)the colouration is formed due to the formation of an Iodine starch complex
III)
i)Iodine is used in treatment of goitre
ii)Iodine is used in making dye for colour photography
6aii)
dalton's law of partial pressure states that in a mixture of non-reacting gases, the total pressureexerted is equal to the sum of the partial pressuresof the individual gases.
6bi)
C - 4.08/12, H - 0.68/1, O - 5.46/16
0.34/0.34, 0.68/034, 0.34/0.34
1, 2, 1.
The emperical formula is CH2O
6bii)
( CH2O)n =60
((12*1)+(1*2)+(16*1))n=60
(12+2+16)n=60
30n/30=60/30
n=2
(CH2O)2=C2H4O2
the molecular formular is C2H202
6ci)
i)exothermic reaction
ii)A is activation energy, B is DH(Negative)
6cii)
i)removeal of carbon(iv)oxide
ii)liquetying the air
6ciii)
vander waal forces
6di)
fats have higher melting point than oil because fats are more denser
6dii)
i)it is poisonous
ii)it is 2,5 times denser than air
iii)it is greenish-yellow gas with a choking smell
6diii)
Zn^2+ has comppletely filled d-orbitals and there are no vacant d-orbitals for the transition of electrons while Sc^3+ has completely empty d-orbital and there are no electrons for d-d transition thus they are colourless
5ai)