#### +1 First Revision Test Model

11th Standard

Reg.No. :
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Chemistry

Time : 02:30:00 Hrs
Total Marks : 70

I. Choose the best suitable answer:

15 x 1 = 15
1. One 'U' stands for the mass of

(a)

An atom of carbon-12

(b)

1/12th of the carbon-12

(c)

1/12th of a hydrogen atom

(d)

One atom of any of the element

2. How many electrons in an atom with atomic number 105 can have (n + I) = 8 ?

(a)

30

(b)

17

(c)

15

(d)

unpredictable

3. Which of the following N3-, O2-, F- is largest in size?

(a)

N3-

(b)

O2-

(c)

F-

(d)

All of these

4. A commercial sample of hydrogen peroxide marked as 100 volume H2O2, it means that

(a)

1 ml of H2O2 will give 100 ml O2 at STP

(b)

1 L of H2O2 will give 100 ml O2 at STP

(c)

1 L of H2O2 will give 22.4 L O2

(d)

1 ml of H2O2  will give 1 mole of O2 at STP

5. Which of the following statements is in correct?

(a)

Li+ has minimum degree of hydration among alkali metal cations

(b)

The oxidation state of K in KO2 is +1

(c)

Sodium is used to make Na / Pb alloy

(d)

MgSO4 is readily soluble in water

6. A bottle of ammonia and a bottle of HCI connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

(a)

At the center of the tube

(b)

Near the hydrogen chloride bottle

(c)

Near the ammonia bottle

(d)

Throughout the length of the tube

7. Molar heat of vapourization of a liquid is 4.8 kJ mol-1. If the entropy change is 16 J mol -1 K-1, the boiling point of the liquid is

(a)

323 K

(b)

27° C

(c)

164 K

(d)

0.3 K

8. $A+B\rightleftharpoons C+D,{ k }_{ c }$for this reaction is 10. If c 1, 2, 3, 4 mole/litre of A, B, C and D respectively are present in a container at 25°C, the direction of reaction will be

(a)

From left to right

(b)

From right to left

(c)

Reaction is at equilibrium

(d)

Unpredictable

9. Which of the following aqueous solutions has the highest boiling point?

(a)

0.1 M KNO3

(b)

0.1 M Na3PO4

(c)

0.1 BaCl2

(d)

0.1 M K2SO4

10. In the formation of ethylene molecule, the carbon atom makes use of___________ hybridisation.

(a)

sp

(b)

Sp2

(c)

sp3

(d)

dsp2

11. Structure of the compound whose IUPAC name is 5,6 - dimethylhept - 2 - ene is

(a)

(b)

(c)

(d)

None of these

12. Hyper Conjugation is also known as

(a)

no bond resonance

(b)

Baker - nathan effect

(c)

both (a)and (b)

(d)

none of these

13. How many structural isomers are possible for the molecular formula C4H8 which can undergo ozonolysis?

(a)

2

(b)

4

(c)

3

(d)

1

14. Which of the following does not form grignard reagent on reaction with Mg in the presence of ether?

(a)

Chloro ethane

(b)

1 - Chluro propane

(c)

Vinyl chloride.

(d)

Bromo benzene

15. Bhopal Gas Tragedy is a case of _____________

(a)

thermal pollution

(b)

air pollution

(c)

nuclear pollution

(d)

land pollution

16. II. Answer any six questions. Q.No 18 is compulsory

6 x 2 = 12
17. Calculate the equivalent masses of the following - HNO3

18. The stabilisation of a half filled d - orbital is more pronounced than that of the p-orbital why?

19. Explain about the factors that affect electronegativity.

20. Mention the postulates of kinetic theory of gases which do not explain the behaviour of real gases.

21. For a gaseous homogeneous reaction at equilibrium, number of moles of products are greater than the number of moles of reactants. Is KC is larger or smaller than KP.

22. Indicate the $\sigma$ and $\pi$ bonds in the following molecules.
C6H6, CH2CI2, CH3NO2, CH2=C=CH2

23. 0.24g of an organic compound gave 0.287 g of silver chloride in the carius method. Calculate the percentage of chlorine in the compound.

24. When does the carbon in an alkene molecule acquires a positive charge? Explain.

25. What happens when acetyl chloride is treated with excess of CH3MgI?

26. III. Answer any six questions. Q.No 27 is compulsory

6 x 3 = 18
27. How many moles of hydrogen is required to produce 10 moles of ammonia?

28. Which of the following pairs of elements would have more negative electron gain enthalpy? (I) O or F(ii) For Cl.

29. How do you convert parahydrogen into ortho hydrogen?

30. A sample of gas has a volume of 8.5 dm3 at an unknown temperature. When the sample is submerged in ice water at 0 °C, its volume gets reduced to 6.37 dm3. What is its initial temperature?

31. Give reason for the following statements. U is an extensive property

32. What is the mass of glucose (C6 H12O6) in it one litre solution which is isotonic with 6 g L-1 of urea (NH2 CO NH2)?

33. Write about the main responsibility of the functional group in an organic compound.

34. Listout the uses of alkanes.

35. From where does ozone come in the photo chemical smog?

36. IV. Answer all the questions in detail:

5 x 5 = 25
1. Balance the following equation by ion electron method.
Zn + NO3- ⟶ Zn + NH4+2

2. Explain the following, give appropriate reasons.
(i) Ionisation potential of N is greater than that of O.
(ii) First ionisation potential of C-atom is greater than that of B atom, where as the reverse is true is for second ionisation potential.
(iii) The electron affinity values of Be, Mg and noble gases are zero and those of N (0.02 eV) and P (0.80 eV) are very low.
(iv) The formation of F-(g) from F(g) is exothermic while that of O2-(g) from O (g) is endothermic.

1. Draw the hydrogen bonding existing following compounds.
(i) Acetic acid (ii) Methanol water (iii) Ammonia in water (iv) HF and (v) Water.

2. Describe briefly the biological Importance of Calcium and magnesium

1. Give a detailed account on compressibility factor

2. Define the following terms
(a) isothermal process (b) adiabatic process
(c) isobaric process (d) isochoric process

1. The atmospheric oxidation of NO
2NO(g) + O2(g) ⇌ 2NO2(g)
was studied with initial pressure of 1 atm of NO and 1 atm of O2. At equilibrium, partial pressure of oxygen is 0.52 atm calculate Kp of the reaction.

2. Explain the stepwise purification of a solid organic compound through crystallization.

1. Explain the mechanism involved in bimolecular nucleophilic substitution reaction.

2. Mention the standards prescribed by BIS for quality of drinking water