CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Practice Paper 4

Practice Paper 4

1. State De Brogle equation?
2. What Is The Co- ordination number of atoms in a cubic closed packed structure?
3. Explain with example the term weak and strong electrolytes?
4. Mention the factor that affect the rate of a chemical reaction?
5. What role does adsorption play in hetrogeneious catalysis?
6. Give the name of ores of lead and tin ?
7. Draw the structure of PCL5?
8. What is meant by the denticity of a ligand?
9. Give example of monodentate and bidentate?
10. Define mutarotation?
11. What is an antibiotic? Give the name of the first antibiotic discovered?
12. A moving electron has 4.55* 10 –25 j. of kinetic energy calculate its wavelength (mass- 9.1*10-31kg. And h=6.6*10-34 kg. M.2 s-1)
13. State Heisenberg uncertainity principle .Give its mathematical expression?
14. How many ml. Of a 0.1 mole HCL are required to react completely with one gram mixture of Na2Co3 and NaHCO3 Containing equimolar amount of two?
15. What is meant by positive and negative deviation from ROULTS LAW?
16. Why would expect a decrease in ENTROPY as a gas condenses in to liquid . compare it with entropy decrease when a liquid sample is converted in to a solid ?
17. A solution of NI(NO3)2 is electrolyte between platinum electrodes using a current of 5 ampere for 20 min. what mass of NI is deposited at the cathode?
18. THE resistance of a conductivity cell containing 0.001 M KCL solution at 298 k. is 1500 ohm. What is the cell constant if conductivity of 0.001 m KCL Solution at 298 K. IS 0.146*10-3 S.CM –1?
19. Give reason why a finely divided substance is more effective as an absorbent?
20. Explain the structure of DIBORANE?
21. Using IUPAC name write the formula of the following –
    (a) pentaamine nitrito –o- cobalt (iii)
    (b) potassium tetra chloro palladate(ii)
22. Draw the wedge and dash formula of the simplest CHIRAL ALKANE , ALKENE and ALKYNE?
23. Write the structural formula and names of the four possible ALDOL condensation product from PROPANOL and BUTANOL in each case indicate s which aldehydes served Nucleophile and electrophile?
24. Write the mode of free radical polymerization of an Alkene?
25. What is DENATURATION and RENATURATION of protiens?
26. Harmon are chemical massengar explain?
27. HOW do you prepare p- NITRO ANILINE from ANILINE?
28. THE first order of defrection of x - rays from a certain set of crystal planes occurs at an angle of 11.8 degree from the planes if the plane are 0.281nm. apart what is the wavelength of x- rays?
29. The enthalpy of vapourisation of a liquid DIETHYLE – ETHER (C2H5)2 O is 26.0kj./mole at its boiling point 35.0 degree celsios?
    Calculate del s for conversion of
    (a) liquid to vapour
    (b) vapour to liquid at 35.0 degree celsious ?
30. The rate of most reaction s double when their temp. is raised from 298 k. to 308 k. calculate their activation energy?
31. HOW are xenon flourides XeF2 and XeF4 prepared ? deduce their structure applying VSPER theory?
32. Illustrate with an example each of the following --
    (a) Ionization isomerism
    (b) Linkage isomerism
    (c) Co- ordination isomerism
33. Calculate the mass of 140 la in a sample whose activity is 3.7*10-10 BQ(1 BECQUEREL, BQ = 1 DISINTIGRATION PER SEC. ) gives that its t ½ is 40 hours ?

1. Atomic Structure and Chemical Bonding
2. Solid State
3. Solutions
4. Thermodynamics
5. Electrochemistry
6. Chemical Kinetics
7. P Block Elements
8. D and F Block Elements
9. Nuclear Chemistry
10. Stereo Chemistry
11. Organic Functional Group I
12. Organic Functional Group II and III
13. Surface Chemistry
14. Chemistry In Every Day Life
15. Polymers
16. Practice Paper No.1
17. Practice Paper No.2
18. Practice Paper No.3
19. Practice Paper No.4