1 S – Block Elements
Alkaline earth metals burn in nitrogen and form nitrides of type M3N2. which of them is volatile in nature?
1) Mg3N2 2) Ba3N2 3) Ca3N2 4) Be3N2
2 Solid State
The edge length of the unit cell of NaCl crystal lattice is 552 pm. If the ionic radius of sodium ion is 95 pm., what is the ionic radius of chloride ion ?
1) 368 pm 2) 190 pm 3) 276 pm 4) 181 pm
3 Aldehydes Ketones and Carboxylic Acids
The final product of the oxidation of ethyl alcohol is :
1) Acetic acid 2) Ethane 3) Acetaldehyde 4) Acetone.
Solution
4 Alcohols Phenols and Ethers
The final product of oxidation of $$2-propanol$$ with hot con. $$HNO_{3}$$ is
1) Propanal 2) Ethanoic acid 3) Propanone 4) Ethanol
$$\underset {propan-2-ol}{CH_{3}CHOHCH_{3}} \xrightarrow {[O]} \underset {acetone}{CH_{3}COCH_{3}}\xrightarrow {[O]} \underset {\text {acetic acid or ethanoic acid}}{CH_{3}COOH} + CO_{2} + H_{2}O$$.
5 Stoichiometry
When 0.5g. of sulphur is burnt to SO2 4.6 kj of heat is liberated. What is the enthalpy of formation of sulphur dioxide? (S=32 and O=16)
1) -147.2KJ 2) + 147.2KJ 3) + 294.4KJ 4) - 294.4KJ.
6 Thermodynamics
One mole of an anhydrous salt AB dissolves in water with the evolution of 21.0 J/mol of heat. If the heat of hydration of AB is -29.4 J/mol then the heat of dissociation of the hydrated salt AB is 1) 50.4 J/mol 2) 8.4 J/mol 3) -54.4 J/mol 4) -8.4 J/mol
(i) AB(s) + aq → AB(aq); ΔH=-21 J (ii) AB(s) + xH2O → AB. xH2O; ΔH=-29.4 J Aim: AB x H2O(s) + aq → AB(aq) ; ΔH=? Eqn(i) is equivalent to AB(s) + xH2O → AB.xH2O(s); ΔH=ΔH1 AB.xH2O(s) + aq → AB(aq), ΔH=ΔH2 ΔH1 + ΔH2=-21 -294.4 + ΔH2=-21 ΔH2=8.4 J/mol
7 Coordination Compounds
Potassium crystallizes in a body centered lattice Hence the coordination number of potassium in potassium metal is 1) Zero 2) 8 3) 6 4) 4
For bcc lattice, co- ordination number is 8
8 Solutions
The number of sodium atoms in 2 moles of sodium ferrocyanide is
1) 8 x 6.02 x 1023
2) 4 x 6.02 x 1023
3) 6.02 x 1023
4) 2
Formul of sodium ferrocyanide Na4?[Fe(CN)6?] of suggest that it has four sodium atoms.
Number of Na atoms= Number of moles × number of atoms per molecule × Avogadro number
=2×4×6.023×1023
=48×1023
9 Biomolecules
Ribose is an example of a/an: 1) aldopentose. 2) ketohexose. 3) aldohexose. 4) disaccharide.
10 D and F Block Elements
Which is wrongly matched ?
1) Duralumin-Al+Cu+Mg+Mn 2) Alnico-Fe+Al+Ni+Co 3) German silver-Cu+Zn+Ni 4) Monel metal-Cu+Zn+Sn
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