#### +1 FIRST REVISION TEST

11th Standard

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Chemistry

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

PART-A

15 x 1 = 15
1. 7.5 g of a gas occupies a volume of 5.6 litres at 0° C and 1 atm pressure. The gas is

(a)

NO

(b)

N2O

(c)

CO

(d)

CO2

2. Which of the following provides the experimental justification of magnetic quantum number?

(a)

Zeeman effect

(b)

Stark effect

(c)

Uncertainty principle

(d)

Quantum condition

3. Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

(a)

Decreases in a period and increases along the group

(b)

Increases in a period and decreases in a group

(c)

Increases both in the period and the group

(d)

Decreases both in the period and in the group

4. Which pair are not hydrogen isotopes?

(a)

Ortho and para hydrogen

(b)

Protium and deuterium

(c)

Deuterium and tritium

(d)

Tritium and protium

5. Which of the following has the highest tendency to give the reaction $M_{g}^{+}\xrightarrow[Medium]{Aqueous}M_{aq}^{+}$

(a)

Na

(b)

Li

(c)

Rb

(d)

K

6. Identify the correct mathematical expression of Graham's law of diffusion.

(a)

$\frac { { r }_{ 2 } }{ { r }_{ 1 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(b)

${ r }_{ 1 }r_{ 2 }=\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(c)

$\frac { { r }_{ 1 } }{ { r }_{ 2 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(d)

$\frac { { r }_{ 1 } }{ { r }_{ 2 } } ={ \left[ \frac { { M }_{ 2 } }{ { M }_{ 1 } } \right] }^{ 2 }$

7. If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride gas, then

(a)

ΔH > ΔU

(b)

ΔH - ΔU = 0

(c)

ΔH + ΔU = 0

(d)

ΔH < ΔU

8. For the homogeneous gas reaction at 600K $4NH_{ 3\left( g \right) }+5{ O }_{ 2\left( g \right) }\rightleftharpoons 4NO_{ \left( g \right) }+6{ H }_{ 2 }{ O }_{ \left( g \right) }$ The equilibrium Kc has the unit.

(a)

(mol dm-3)-1

(b)

(mol dm-3)1

(c)

(mol dm-3)10

(d)

(mol dm-3)9

9. Normality of 1.25M sulphuric acid is

(a)

1.25 N

(b)

3.75 N

(c)

2.5 N

(d)

2.25 N

10. During change of ${ O }_{ 2 }$ to ${ O }_{ 2 }^{ - }$ ion, the electron adds on which one of the following orbitals?

(a)

$\pi$ orbitals

(b)

$\sigma -$orbitals

(c)

$\pi^*$ orbitals

(d)

$\sigma ^*$orbitals

11. The IUPAC name of the Compound is

(a)

2,3 - Diemethylheptane

(b)

3- Methyl -4- ethyloctane

(c)

5-ethyl -6-methyloctane

(d)

4-Ethyl -3 - methyloctane

12. The most stable carbocation is

(a)

$C{ H }_{ 3 }-\overset { + }{ C } { H }_{ 2 }$

(b)

$C{ H }_{ 3 }-\overset { + }{ C } H-C{ H }_{ 3 }$

(c)

$C{ H }_{ 2 }=CH-\overset { + }{ C } { H }_{ 2 }$

(d)

$\overset { + }{ C } { H }_{ 3 }$

13. In which of the following molecules, all atoms are co-planar

(a)

(b)

(c)

(d)

both (a) and (b)

14. Ozone depletion will cause

(a)

forest fires

(b)

eutrophication

(c)

bio magnification

(d)

global warming

15. Cause of eutrophication is

(a)

Increase of oxygen in water bodies

(b)

Increase in number of aquatic organisms

(c)

Nutrient enrichment of water bodies

(d)

All ofthese

16. PART -B

6 x 2 = 16
17. Calculate the equivalent masses of the following - Oxalic acid H2C2O4

18. Magnesium loses electrons successively to form Mg+, Mg2+ and Mg3+ ions. Which step will have the highest ionisation energy and why?

19. Lithium iodide is covalent. Explain why?

20. Define the calorific value of food. What is the unit of calorific value?

21. What are the non-aqueous solution? Give example

22. Give a brief description of the principles of
i) Fractional distillation
ii) Column Chromatography.

23. Which of the following ions is more stable? Use resonance to explain your answer.

24. Identify A, Band C from the following equation

25. What is green chemistry?

26. PART -C

6 x 3 = 18
27. Calculate the uncertainty in position of an electron, if Av = 0.1% and $\upsilon$ = 2.2 x 106 ms-1.

28. Mention any two biological effects of D2O.

29. Do you think that heavy water can be used for drinking purposes?

30. Give the systematic names for the following
(i) milk of magnesia
(ii) lye
(iii) lime
(iv) Caustic potash
(v) washing soda
(vi) soda ash
(vii) trona

31. Which of the following gases would you expect to deviate from ideal behavior under conditions of low-temperature F2, CI2, or Br2? Explain.

32. For the reaction
SrCO3 (s) ⇌ SrO (s) + CO2(g),
the value of equilibrium constant KP = 2.2 × 10–4 at 1002 K. Calculate KC for the reaction.

33. What happens when the' concentration of H2 and I2 are increased in the reaction ${ H }_{ 2 }+{ I }_{ 2 }\rightleftharpoons 2HI?$

34. 0.40 g of an iodo-substituted organic compound gave 0.235 g of AgI by carius method. Calculate the percentage of iodine in the compound. (Ag = 108, I = 127) (Ans = 31.75)

35. Carry over the following reaction mechanisms.
(i) Bromination of alkene
(ii) Addition of HCN to CH3CHO
(iii) Formation of alkyl bromide with benzoyl peroxide as radical initiator.

36. PART -D

5 x 5 = 25
37. A Compound on analysis gave Na = 14.31% S = 9.97% H= 6.22% and 0= 69.5% calculate the molecular formula of the compound if all the hydrogen in the compound is present in combination with oxygen as a water of crystallization. (molecular mass of the compound is 322).

38. The Li2+ ion is a hydrogen like. ion that can be described by the Bohr model. Calculate the Bohr radius of the third orbit and calculate the energy of an electron in 4th orbit.

39. List out and compare the chemical properties of metals and non-metals.

40. Define hydrogen bond and its types.

41. Alkaline earth metal (A), belongs to 3rd period reacts with oxygen and nitrogen to form compound (B) and (C) respectively. It undergo metal displacement reaction with AgNO3 solution to form compound (D).

42. Consider the following reaction
Fe3+(aq) + SCN(aq) ⇌ [Fe(SCN)]2+(aq)
A solution is made with initial Fe3+, SCN- concentration of 1 x 10-3 M and 8 x 10-4 M respectively. At equilibrium [Fe(SCN)]2+ concentration is 2 x 10-4 M. Calculate the value of equilibrium constant.

43. What is the molarity of the solutions prepared by diluting 25.0 mL of 0.312M MgCl2 solution to each of the following volumes (a) 40 mL (b) 100mL (c) 350mL?

44. Describe the estimation of the amount of nitrogen present in an organic compound by Dumas method.

45. Predict the product:
(i) Chloroform + O2 ⟶?
(ii) CCl4 + H2O ⟶?
(iv)
(iv) ${ CH }_{ 3 }-CH{ Cl }_{ 2 }+KOH\overset { { C }_{ 2 }{ H }_{ 5 }{ OH }_{ 3 } }{ \longrightarrow }$?
(v) Ethylene glycol + 2PCI5 ⟶?

46. How is acid rain formed? Explain its effect