#### First Mid Term Model Questions

11th Standard

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Chemistry

Time : 01:00:00 Hrs
Total Marks : 50
5 x 1 = 5
1. 40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left. after cooling to room temperature is

(a)

40 ml CO2 gas

(b)

40 ml CO2 gas and 80 ml H2O gas

(c)

60 ml CO2 gas and 60 ml H2O gas

(d)

120 ml CO2 gas

2. Hot concentrated sulphuric acid is a moderately strong oxidizing agent. Which of the following reactions does not show oxidising behaviour?

(a)

Cu + 2H2 SO4 $\longrightarrow$ CuSO4 +SO2 + 2H2O

(b)

C + 2H2 + SO4 $\longrightarrow$ CO2 + 2SO2 + 2H2O

(c)

BaCl2 + H2SO4 $\longrightarrow$ BaSO4 + 2HCl

(d)

None of the above

3. Which of the following compound(s) has /have a percentage of carbon same as that in ethylene (C2H4)

(a)

propene

(b)

ethyne

(c)

benzene

(d)

ethane

4. Molecular mass =

(a)

Vapour Density x 2

(b)

Vapour Density $\div$2

(c)

Vapour Density x 3

(d)

Vapour Density

5. Assertion: Helium has the highest value of ionization energy among all the elements known
Reason: Helium has the highest value of electron affinity among all the elements known

(a)

Both assertion and reason are true and reason is correct explanation for the assertion.

(b)

Both assertion and reason are true but the reason is not the correct explanation for the assertion

(c)

Assertion is true and the reason is false

(d)

Both assertion and the reason are false

6. 5 x 2 = 10
7. What do you understand by the term oxidation number?

8. How fast must a 54g tennis ball travel in order to have a de Broglie wavelength that is equal to that of a photon of green light 5400$\overset { 0 }{ A }$ ?

9. Give the number of electrons in the following species. H2 , H2 , O2 and O2-

10. State Mendeleev's periodic law.

11. State Dalton's law of partial pressure.

12. 5 x 3 = 15
13. What is the difference between molecular mass and molar mass? Calculate the molecular mass and molar mass for carbon monoxide.

14. Calculate the Formula Weights of the following compounds.NaOH

15. An atom of an element has 19 electrons. What is the total number of p-orbital?

16. What are inner transition elements?

17. In the below figure, let us find the missmg parameters [volume in (b) and temperature in (c)]
PI = 1 atm, P2 = 1 atm, P3 = 1 atm
V1 = 0.3 dm3, V2 = ? dm3, V3 = 0.15 dm3
T1 = 200 K, T2 = 300 K, T3 = ? K.

18. 4 x 5 = 20
19. The reaction between aluminum and ferric oxide can generate temperatures up to 3273 K and is used in welding metals. (Atomic mass of AC = 27 u atomic mass of O = 16 u )
2Al + Fe2O3 $\longrightarrow$ Al2O3 + 2Fe;  If in this process, 324 g of aluminum is allowed to react with 1.12 kg of ferric oxide
i) Calculate the mass of Al2O3 formed
ii) How much of the excess reagent is left at the end of the reaction?

20. Distinguish between the following.
(i) Atomic and molecular mass
(ii) Atomic mass and atomic weight
(iii) Empirical and molecular formula
(iv) Moles and molecules.

21. Explain the merits of Moseley's long form of periodic table.

22. A helium filled balloon had a volume of 400 mL, when it is cooled to -120°C. what will be its volume if the balloon is warmed in an oven to 100°C assuming changes in pressure.