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A cubic solid is made of two elements X and Y. Atoms Y are at the corners of the cube and X at the body centre. What is the formula of the compound?Marks:1
The contribution due to Y atoms at corner = 1/8
Number of Y atoms at the corner = 8 x 1/8 = 1
The contribution due to X atoms at the body centre = 1
formula of the compound = XY
Two liquids A and B boil at 145°C and 190°C respectively. Which of them has a higher vapour pressure at 80°C?Marks:1
A has higher vapour pressure than B at 800C because boiling point of A is lower than B.
For the reaction A → B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times. What is the order of the reaction?Marks:1
Rate law expression suggest that,
rate = k [A]n
or, r = k [A]n
according to question
27 r = k[3A]n -------------- (ii) 27 r = 3nk[A]n 27 r = 3nr
27 = 3n 33 = 3n n = 3
Hence, order of reaction is 3
Write the IUPAC name of: CH3.CH(Br)CH2CONHCH3.Marks:1
Give a chemical test to distinguish between aniline and N-methyl aniline.Marks:1
Aniline gives carbylamine test but N-methyl aniline does not give this test. In this test when aniline is heated with chloroform and alcoholic KOH it forms foul smelling carbylamine.
What is meant by entropy driven reaction? How can a reaction with positive changes of enthalpy and entropy be made entropy driven?
out of syllabusMarks:2
The reaction where
H is positive but -T S is numerically larger then it is known as entropy driven reaction.
G = H -T S
G should be negative for spontaneous reaction.
The reaction will become entropy driven if
(i) S is positive and is small but T must be large.
(ii)S is positive and is large but T must be small.
Write balanced chemical equations for the following reactions:
Ca3P2 + H2O → (ii) XeF6 + 3 H2O →Marks:2
(i) Ca3P2 + 6H2O → 3Ca(OH)2 + 2PH3 (ii) XeF6 + 3H2O → XeO3 + 6HF.
Write chemical equations for the reactions involved in the manufacture of potassium permanganate from pyrolusite ore.Marks:2
What are enantiomers? Draw the structures of the possible enantiomers of 3-methyl pent-1-ene.Marks:2
Those optical isomers which are non-superimposable mirror image of each other are called enantiomers or enantiomorphs.
Write the reactions and the conditions involved in the conversion of:
Propene to 1-Propanol (1)
Phenol to Salicyclic acid (1)Marks:2
(a) Propene to 1-Propanol:-
(b) Phenol to Salicylic acid:-