VIDYA BHARATISCHOOL
Annual Examination: 2016-17
Class: XI
Blue Print
Roll No.
• Please check that this question paper contains 3printed pages.
• Set given on the right hand side of the question paper should be written on the title
page of the answer-book by the candidate.
• Please check that this question paper contains 26 questions.
• 15 minutes time has been allotted to read this question paper. The question paper
will be distributed at 8.15 a.m.From 8.15 a.m. to 8.30 a.m., the students will read
the question paper only and will not write any answer on the answer script during
this period.
CHEMISTRY
Time Allowed: 3 hours
Maximum Marks: 70
General Instructions:
1.
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7.
All questions are compulsory.
Marks for each question are indicated against it.
Question No.1 to5arevery short answer questions and carry 1 mark each.
Question No.6to 10are short answer questions and carry 2 marks each.
Question No.11to22are also short answer questions and carry 3 marks each.
Question No.23 is a Value Based Question and carry 4 marks.
Question No.24to26 are long answer questions and carry 5mark each.
Q1.Write IUPAC name and symbol for the element with atomic number 115(1)
Q2. Write real gas equation for ‘n’ moles of gas.(1)
Q3. What will be the sign of work done in following equation?(1)
2SO2 (g) + O2 (g)
2SO3 (g)
Q4. Write Kp in terms of Kc for the following chemical equation: (1)
N2 (g) + 3H2 (g) 2NH3 (g)
Q5. Arrange the following in order of property mentioned: (1)
a. NaCl, NaBr, NaF, NaI (Increasing ionic character)
Q6. The density of water of a lake is 1.25 g ml-1 and 1kg of this water contains
(2)
+
+
92 g of Na ions. What is the molarity of Na ions in the water of the lake? (Atomic Mass
of Na=23u)
Q7. Account for the following: (2)
a. NF3 is pyramidal while BF3 is triangular planar.
b. Bond angle in H2O is larger than bond angle in H2S.
Q8. a. The enthalpy of neutralization of weak acid and strong base is less than
(2)
57.1 kJ mol-1.Why?
b. Why is ∆U a state function?
OR
State the first law of thermodynamics. Give its mathematical expression.
Q9. a. Mention the type of hybridization in each carbon in the following compound:(2)
CH2 ═CH─C≡CH
b. Draw the structure of 3-methylbutanal.
Q10. During nitrogen estimation present in an organic compound by Kjeldahl’s method, the(2)
ammonia evolved from 1.0g of the compound neutralized 10 ml of 2M H2SO4. Find the
percentage of Nitrogen in the compound. [Atomic Mass : N=14 H=1]
Q.11 a. State Law of constant proportion.
(1+2)
b. What mass of CaCl2 will be formed by reaction of excess of CaCO3 with 25ml of 0.75M
HCl according to equation?
CaCO3(s) +2HCl (aq)
CaCl2 (aq)+CO2(g)+H2O(l)
Q.12. a. One unpaired electron in atom contributes a magnetic moment of 1.1 BM.
(3)Calculate
the magnetic moment of chromium. [At. No. of Cr = 24]
b. The uncertainty in position of and velocity of a particle are 10-2 m and 5.27 x 10-24 ms-1
respectively. Calculate the mass of the particle. (h=6.62x10-34 kgm2s-1)
Q.13.a.StateAufbau’s principle.
(3)
b. Account for the following:
i. ‘N’ has electronic configuration 1s22s22px12py12pz1 and 1s22s22px22py1.
ii. Bohr’s orbits are called stationary states.
Q.14.Account for the following:
(3)
a. Ionization enthalpy of ‘Ne’ is more than ‘F’ although ‘Ne’ has bigger atomic size
than ‘F’.
b. Al3+ is smaller than Mg2+ although both are isoelectronic.
c. Noble gases have low boiling points
Q.15. a. Write the molecular orbital configuration of O2+. Calculate the bond order
(3)
and predict its magnetic behavior.
b. What is the state of hybridization in ‘N’ in NO3-?
Q.16. Whatis the SI unit of density?
(3)
b. Calculate the volume occupied by 88g of CO2 at 30°C and 1bar pressure. (R = 0.083 bar L
K-1 mol-1)
Q.17. Calculate the heat of combustion of glucose from the following data:
(3)
C (graphite) + O2 (g)
H2 (g) + ½ O2 (g)
6C (graphite) + 6H2 (g) + O2 (g)
CO2 (g); ∆H = -395.0 Kj/mol
H2O (l)
∆H = -269.4 Kj/mol
C6H12O6(s) ∆H = -1169.8kJ/mol
Q18 a. Give an example of redox reaction.
b. Balance the following redox reaction by ion electron method (in acidic medium):
Cr2O7-2+Fe+2+H+
Cr+3+Fe+3+H2O
Q19 a. Name the isotope of hydrogen in which neutrons are twice the number
Ofprotons.
b. Complete the following equations:
i. Mg(HCO3)2 + Ca(OH)2
(3)
(3)
ii. KI + H2O2
Q20 a. Arrange the following in order of the property of mentioned against each:
(3)
a) CH3., CH3C.H CH3, ( CH3)3C.
b) ClCH2COOH, FCH2COOH, BrCH2COOH, ICH2COOH [Increasing acidic
strength]
b. Write the isomerism among the following compounds: CH3COOH, HCOOCH3
Q21 a. Write the IUPAC name of the following compound:
CH3─CH2─CH2─CH═CH2
d. What are ‘A’ and ‘B’ in the following reactions?
CH3CH2Br
i) HC≡CH +2Na
A
B
(3)
ii.) CH3CH2Br + KOH (alc.)
Q.22 Explain the terms: a. Photochemical Smog b. BOD c. Acid Rain
(3)
Q.23 Chief Justice D Murugesan and Justice VK Jain have asked Delhi Govt.
(4)
to prevent the sale of junk food and aerated drinks in school canteens and areas near to
school. Mr. SurajPrakash, Principal has banned junk food and aerated drinks in his school.
He has replaced it with fresh fruit juices and nimbupani and rajma chawal. These are being
served instead of burger and chowmein.
e. What values are possessed by Mr. SurajPrakash?
f. Why should we avoid junk food?
g. What are the advantages of fresh fruit juice, rajmachawal over junk food.
h. What are the disadvantages of cold drink?
(1+2+2)
Q.24 a. Write conjugate base of NH4+
b. Calculate pH of 1.0x10-8 M solution of NaOH
c. Calculate the solubility of Ca3(PO4)2 in pure water if its solubility product is 1.08x10-2
Q25. a. Draw the structure of Al2Cl6.(1+2+2)
b. What happens when:
i. Aluminium is reacted with dil. H2SO4?
ii. boric acid is added to water?
c. Give suitable explanations for:
i. B does not form B3+ ion.
ii. Acidic character of dioxides of group 14 decreases down the group.
Q26.a. Explain the following reactions with suitable example.
(2+3)
i. Decarboxylation
ii. Freidal-Crafts acylation reaction
b. An alkene ‘A’ on ozonolysis followed by reaction with Zn/H2O gives propanal and
propanone. Write structural formula of ‘A’ and chemical reactions involved.
c. Give one chemical test to distinguish between 1-butyne and 2-butyne