Download Assignment Chemistry Class XI (2016-17)

Assignment
Chemistry Class XI (2016-17)
1. Express decimal equivalent of 2/3 to three significance places.
2. The human body temperature is 98.6 0 F. What is value in 0C and K?
3. One atom of an element weights is 9.75 ×10-23 g. calculate its atomic mass.
4.Round up the following to three significant figure
(i) 10.4207 (ii) 0.04597 (iii) 5.000 (iv) 2808
5. Calculate the amount of carbon dioxide that could be produced when 2 mole of
carbon are burnt with 16 g of dioxygen
6. What is meant by a.m.u.
7. Is the molar volume of NH3 different from that of CO2
8. Name a monoatomic gas? What is its valency?
9. What is gram molecular mass? Give one example.
10. How many atoms of carbon are present in 0.1 mole of C 12H22O11
11. Name the law which deals with the ratios of the volume of gaseous reactants
and products.
12. Which isotope of C is used for expressing relative atomic masses of elements?
13.Give the SI units (i) volume (ii) speed (iii) force
14. Define morality. What does 1 M solution of sodium carbonate mean
15. Write the balanced chemical equation for the following reaction :
(i) Manganese dioxide and concentrated hydrochloric acids
(ii) Sodium thisosulphates and iodine
(iii) Copper and dilute nitric acid
(iv) Sulphur dioxideand hydrogen sulphide.
16. Which of the followin g has (i) maximum (ii) minimum mass?
(a) 1 gram atom of C
(b) 1 a.m.u. of an atom
© 1 gram mole f sulphur
dioxide
(d) 6.02×1020 atoms of nitrogen
17 A sample of drinking water was found to be severely contaminated with
chloroform,CHCl3,supposed to be carcinogenic in nature. The level of contamination
was 15 ppm (by mass)
(i)Express this in per cent by mass
(ii ) Determine the molality of choloroform in the water sample
18. In the reaction:
2A + 4B → 3C + 4D
(i)Which is limiting reagent?
(ii)Calculate the amount of C formed
19 (i) How are 0.50 m Na2CO3 and 0.50M Na2CO3 different?
(ii) If 20.0 g of CaCo3 is treated with 20.0 of HCI, how many grams of CO 2 can be
produced according
to the reaction:
CaCO3(s) + 2HCI(aq) → CaCl2(aq) + H2O(l) +CO2(g)
20.(i) A crystallite salt on being rendered anhydrous loses 45.6% of its weight. The
composition of anhydrous salt is : Al = 10.5% K = 15.1% ,S = 24.8% and O =
49.6%. Calculate the formula of anhydrous salt and crystal line salt ( at mass of Al =
27 , K = 39, O = 16).
(ii) Calculate the mass of 1 u (atomic mass unit) in grams.
21 The threshold frequency for a metal “X” is 7.0 ×10 14 S-1. Calculate the kinetic
energy of an electron emitted when radiation of frequency 1.0 ×10 15 s-1 strikes the
metal.
22 A photon of wavelength 4.0 ×10-7 m strikes on metal surface, the work function
of the metal being 2.13 eV Calculate:
(i) the energy of photon(eV)
(ii) the kinetic energy of the emission and
(iii) the velocity of the photoelectron emitted(leV=1.620 ×10 -19J)s
23 What is the maximum number of emission lines when the excited electron of H
atom in n= 6 drops to the ground state?
24 Which of the following are issoelectronic species:
Na+,K+,Mg2+,Ca2+,S2-,Ar?
(a) An atomic orbital has n=3. What are the possible values of l and m1?
(b) List the quantum number (m1 and l) of electrons for 3d orbital.
© Which of the following orbital are possible?
1p,2s,2p and 3f
25 Using s,p,d notations, describe the orbital with the following quantum number.
(a) n=1,l=0;
(b) n=3;l=1
© n=4;l=2
(d) n=4;l=3
26 How many electrons in an atom may have the following quantum number?
n=4,ms=-1/2
(b) n=3,l=0
28 (a) How many sub-shells are associated with n=4?
(b) How many electrons will be present in the sub-shell having m8 value of
-1/2 for n=4?
Which of the following sets of orbitals are degenerate and why?
I
1s, 2s and 3s in mg atom
Ii
2px,2py and 2pz and C atom
Iii
3s,3px, and 3d orbitals in H atom
29 i) What is the difference in the orbital angular momentum of 2p and 3p
electron? Explain?
ii) Can we apply uncertainly principle to stationary electrons?
30 i) Cu2+ is more than stable than Cu+ in aqueous solution. Explain?
ii)Predict the number of nodals planes in (i) 3p x, (ii) 4s (iii) 3dx2-y2.
31 A bulb emits light of wavelength 4500 A. The bulb is rated as 150 watt and 8%
of the energy is emitted as light. How many photons are emitted the bulb per
second?
32 An electron in a H-atom on the ground state abosorbs equal to 1.5 times the
minimum energy required to remove the electron from the H-atom. Calculate the
wavelength of the electron emitted.
33 Calculate the products of uncertainties in the displacement and velocity for an
electron of mass 9.1×10-31 kg according to Heisenberg’s uncertainly principle.
(h=6.6 ×10-34 kg m2s-1)
34 The threshold wavelength for emitting photons from a metal is 6.0 ×10 3 S. What
would be the wavelength of radiation to produce photoelectrons having twice the
kinetic energy of those produced by radiation of wavelength 3×10 3A.
35 The angular momentum of an electron in Bohr’s orbit of H-atom is 3.02×10 -34
kgm2s-1. Calculate the wavelength of the spectral line emitted when the electron
jumps from this level to the next lower level.
Holiday Homework Assignment
Class XI
Biology
1. Name the scientist who gave cell theory.
2. Name the smallest cell and their size.
3. What is cell theory?
4. Expand PPLO.
5. Differentiate between Prokaryotic and Eukaryotic cell.
6. What is the basis of classification of Bacterial cell?
7. What are mesosomes ?write its functions.
8. What are the basic difference between Pilli and Fimbriae?
9. Diagrammatically explain fluid mosaic model of Plasma membrane.
10.Define active and passive transport.
11.Differentiate between animal cell and plant cell.
12.Why Endoplasmic reticulum lies in the close proximity to nucleus?
13.Give brief account of SER and RER.
14.Describe the role of cis and trans phase in golgi bodies with diagram.
15.Name the organelle which has their own DNA.
16. Why DNA is called hereditary vehicles?
17.Write the functions of Amyloplast , elaiopasts and aleuroplasts.
18.What you understand by 9+2 arrangement of axoneme.
19.Explain different types of chromosomes on the basis of the position of
centromere.
20.What type of root modification is seen in Rhizophora ?write its function.
21.What you mean by sucking roots and aerial roots.
22.Define Monopodial axis and Sympodial axis.
23.Name two plants with reduced stem.
24.How can you recognize underground stem to be stem structure?
25.Differentiate between Racemose and Cymose branching with examples.
Mathematics Assignment
1. Convert the given complex number in polar form: – 1 + i
2. Solve the equation 2
+ x+ 1 = 0
3. For any two complex numbers z1 and z2, prove that
Re (z1 z2) = Re z1 Re z2 – Im z1 Im z2
4. Solve the inequality
≤2
5. Solve system of linear inequality
<5,
>7
6. Graphically solve the system of linear inequality
X + 2y ≤ 10, x + y ≥ 1 , x- y ≤ 0, x≥ 0 , y≥ 0
7. The water acidity in a pool is considered normal when the average pH
reading of three daily measurement is between 7.2 and 7.8. if the first two
pH value readings are 7.48 and 7.85, find the range of pH value for the third
readings that will result in the acidity level being normal.
8. Solve the equation : 1 + 6 + 11 + _ _ _ _ + x = 148
9. If 8 AMs between 2 and 29. Also verify that the sum of these 8 AMs is equal
to 8 times the AM between 2 and 29.
10.The sum of the first three terms of a G.P. is 7 and sum of their squares is 21.
Determine first five terms of the G.P.
11.The sum of an infinite G.P. is 6 and sum of its first two terms is 9/ 2. Find
the first term and common ratio.
12. If the A.M. between positive number a and b is twice their G.M. then show
that a:b = 2 + √3 : 2 - √3
13.Find sum of series 15 + 16 + 17 + _ _ _ _ _ + 100
14.Solve : x
(x + 2) = 72
15.A variable complex number z = x +iy is such that principal argument of
is always
/4. Show that
+
- 2y = 1
16.Find modulus and principal argument
17.Prove by mathematical induction that
+
+
is a natural number for
all n є N
18.Prove by mathematical induction
,nє N
<
19.Prove by mathematical induction
20.Prove by mathematical induction
is divisible by x + y; n є N
-
+ 1 is divisible by 11 ; n є N
21.Prove by mathematical induction 1 + + +
+____+
<2- ;
n(>1) є N
PHYSICS WORKSHEET
CLASS – XI
Very short answer type questions
1. How many electrons would weigh 1kg?
2. Determine ∏2 with due regard for significant figures.
3. Do Å and AU stand for same length?
4. Name at least seven physical quantities whose dimensions are ML2T-2.
5. If x= a+bt+ct2 , where x is in metres and t is in second, what is the
dimensional formula of c?
6. Name two quantities with (i) same dimensions (ii)constant value having
dimension.
7. How many newton make one kg wt.
8. Can the relative velocity of two bodies be greater than the absolute
velocity of either?
9. Two masses in the ratio 1:2 are thrown vertically up with the same speed.
What is the effect on the time by the mass?
10. A ball is thrown straight up. What is its velocity and acceleration at the
top?
Short answer type questions
11. The wavelength ƛ associated with a moving particle depends upon its
mass m ,its velocity v and Planck’s constant h. Show dimensionally the
relationship between them.
12. Magnitude of force F experienced by a certain object moving with speed
v is given by F = Kv2 where K is a constant. Find the dimensions of K.
13. The length and breadth of a rectangle are measured as (a± Δa) and
(b±Δb) respectively. Find (i) relative error , (ii) absolute error in the
measurement of area.
14. Write the dimensions of the following: variable force, moment of inertia,
buoyant force, work done by torque, pressure energy, mass per unit area.
15. If (P + a/V2) (V – b)=RT, where the symbols have their usual meanings,
then (a/b) has a dimension of……….
16. Force(F) and density(d) are related as F = α/ (β+√d) (i)then the
dimensions of α are………(ii) then the dimensions of β are……..
17. In an experiment refractive index of glass was observed to be 1.45, 1.56,
1.54, 1.44, 1.54, and 1.53.Calculate (i) mean value of refractive index; (ii)
mean absolute error;(iii) fractional error; (iv) percentage error. Express the
result in terms of absolute error and percentage error.
18. A physical quantity Q is given by
Q = (A2. B3/2) /(C4.D1/2). The
percentage error in A,B,C,D are 1%, 2%, 4%, 2% respectively. Find the
percentage error in Q.
19. A ball is thrown vertically upwards. Draw its (i) velocity-time curve (ii)
acceleration-time curve.
20. Two cars A and B are running at velocities of 60 km/h and 45 km/h
respectively. Calculate the relative velocity of car A if: (i) they are both
travelling eastwards and (ii) car A is travelling eastwards and car B is
travelling westwards.
Long answer type questions
21. A car is moving along a straight highway with speed of 126 km/h is
brought a stop within a distance of 200 m. What is the retardation of the car
(assumed uniform) and how long does it take for the car to stop?
22. A body is moving with a uniform acceleration. Its velocity after 5 seconds
is 25 m/s and after 8 seconds is 34 m/s. Calculate the distance it will cover in
10th second.
23. A body covers 200 cm in the first 2 seconds and 200 cm in the next 2
seconds. What will be its velocity at the end of 7 seconds? Also find the
displacement in 7 seconds?
24. Assuming that the mass (m) of the largest stone that can be moved by a
flowing river depends only upon the velocity v, the density p of water and
the acceleration due to gravity g. Show that m varies, with sixth power of the
velocity of the flow.
25. Experiments show that the frequency (n) of a tuning fork depends upon
the length (l ) of the prong , the density (d) and the Young’s modulus (Y) of
its material. Find a possible relation for the frequency of the tuning fork
dimensionally. Dimensional formula for Y is (ML-1T-2).