By-U S PAL
EXERCISE @6.3
EXERCISE @6.3
Saturday, 30 May 2015
Friday, 29 May 2015
Thursday, 28 May 2015
CHEMISTRY- p,d and f BLOCK PRACTICE PAPER
BY- UTTAM SINGH PAL
1.
Nitrogen
exists as diatomic molecule and phosphorus exists as tetra atomic molecule,
why? [2]
2.
Which
of two PH3 and NH3 is more basic? [1]
3.
Why
is N2 less reactive at room temperature? [1]
4.
Write
the reaction of thermal decomposition of sodium azide [NaN3]. [1]
5.
Determine
the oxidation number of nitrogen in N2O,
NO2, HNO3 and NH3 . [2]
6.
Why
does PCl3 fume in moisture? [1]
7.
What
is the basicity of H3PO4. ? [1]
8.
What
happens when PCl5 is heated.
[1]
9.
Ammonia
is a good complexing agent, why? [1]
10. How is presence of SO2
detected ? [2]
11.
Sea
is the greatest source of some halogens. Comment? [1]
12. Give the reason for cleaning
action of chlorine. [2]
13. How is ammonia manufactured
industrially? Explain [3]
14. Why is dioxygen a gas but sulphur
a solid? [2]
15. Which aerosols deplete ozone? [1]
16.
Describe the
manufacture of sulphuric acid by contanct process. [5]
17.
Why are halogens
are coloured? [1]
18.
How
many water molecules are involved in coordination in CuSo4. 5H2O
?
[1]
19. Why does copper not replace
hydrogen from acids? [1]
20. Calculate the magnetic moment of
manganese in K4[Mn(NCS)6]. [2]
21. What are transition elements? [1]
22. Transition metals and their
compound generally exhibit a paramagnetic behavior? [1]
23. The enthalpies of atomization of
transition elements are high. [1]
24. Describe preparation of potassium
di chromate from iron chromite ore? [2]
25. Compare chemistry of actinoids
with that of lanthanoids with reference to
[3]
i.
Electronic
configuration
ii.
Oxidation state
iii.
Chemical
reactivity
CLASS XII PRACTICE PAPER[ELECTROSTATICS]
BY- UTTAM SINGH PAL
UNIT-1
1-
What is principle
of working of meter- Bridge? 1
2-
When is a Wheatstone
bridge said to be balanced? 1
3-
State and explain
Kirchhoff’s rules? 3
4-
A wire is
carrying a current. Is charged? 1
5-
What is non-ohmic
device? Give example? 2
6-
A 4Ω non
insulated resistance wire is bent in the middle by 1800 and both the
halves are twisted with each other.
What will be its new resistance?
2
7-
How is the
current conducted in metals?
Explain. 2
8-
Define resistance
of a conductor, what is its cause? Explain the factors on which the resistance
of a conductor depends. 3
9- IF A BODY GIVES OUT 109
ELECTRONS EVERY SECOND HOW JKKNUCH TIME IS REQUIRED TO GET
A TOTAL CHARGE OF 1C
FROM IT? 2
10- CAN TWO SIMILARLY CHARGED BALLS
ATTRACT EACH
OTHER? 1
11- NAME ANY TWO BASIC PROPERTIES OF
ELECTRIC CHARGE. 1
12- WHAT IS THE CAUSE OF
CHARGING? 1
13- DOES COULOMB’S LAW OF ELECTRIC
FORCE OBEY NEWTONS THIRD LAW OF MOTION.
1
14- EXPLAIN THE PHENOMENON OF CHARGING
BY INDUCTION. 3
15- AN ELECTRIC DIPOLE CONSIST OF TWO
CHARGES OF +- 0.1µC SEPARATED BY A DISTANCE OF 2.0
CM. THE DIPOLE IS PLACED IN AN EXTERNAL
FIELD OF 105N/C. WHAT MAXIMUM
TORQUE DOES THE FIELD EXERT ON THE DIPOLE. 3
16- WHAT IS A CAPACITOR? DEFINE
CAPACITANCE. DISCUSS ITS UNITS.
3
17- THE CAPACITOR C1 C2 AND C3. FIND
EQUIVALENT CAPACITANCE IN SERIES AND PARALLEL. 5
18- DEDUCE COULOMB’S LAW FROM GAUSS’S
THEOREM. 2
19- STATE GAUSS’S LAW IN
ELECTOSTATICS 1
20-
FIND
ELECTRIC FIELD INTENSITY DUE TO AN INFINITELY LONG STRAIGHT UNIFORMLY CHARGED
WIRE. 2
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