OJEE 2008 dbts

CHEM
Q1. What is the structure of NaCl?
(a) bcc (b) fcc (c) interpenetrating fcc (d) NOT

Q2. Diabetes is detected by testing urine of patient with _____

Q3. (NH4)2Cr2O7 + Ba(N3)2 --> N2 + ___ + ___

Q4. What are heteroleptic complexes ?

Q5. Which is the best indicator for weak base strong acid titrations?

Q6. 1,2-benzene dicarboxylic acid ----> (Ba(OH)2/300°C) ________

Q7. 1,2-benzene diol ..(forgive wrong nomenclature) + CH2I2 + NaOH --->

Q8. Brown crystals of Nitrosocyanoferrocyanate is obtained by reation of ferrocyanide (II) with _______

12 Answers

13
Avik ·

1)-C ?

106
Asish Mahapatra ·

what is interpenetrating fcc?? (ans C)

13
Avik ·

Not a clear idea though, am searching fr it......just thought tht since the radius ratios are not exactly 0.414, the complete structure expands a bit...

13
Avik ·

Got it....Not at all related to my above reasoning in any way though [3]

It means tht it is like the Na+ ions form a separate fcc & Cl- form a separate fcc lattice, which are then kind of merged, n the 2 lattices seem to penetrate.

http://departments.kings.edu/chemlab/animation/nacl.html

13
Avik ·

NaCl, CsCl, ZnS have 2 interpenetrating lattices, whereas there are 3 in the fluorite structure.

39
Pritish Chakraborty ·

6) Benzene...phthalic acid is decarboxylated by barium hydroxide

106
Asish Mahapatra ·

6. answer given benzoic acid

@avik.. thx

39
Pritish Chakraborty ·

OK...I guess because only one mole of Ba(OH)2 is given?

13
Avik ·

4.-Complex compound having more than one type of ligand species.

13
Avik ·

6.- I haven't got ny idea Pritish, Barium Hydroxide is a dehydrating agent ?

106
Asish Mahapatra ·

@pritish.. nothing mentioned about moles of Barium hydroxide...

@avik. Thx again

13
Avik ·

3. A guess - Cr2O3 & Ba(OH)2 ?

8. -Nitric Acid ?

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