Give me question paper for National Institute Of Open Schooling Senior Secondary Exam-Chemistry (313) Examination ?

Here I am giving you question paper for National Institute Of Open Schooling Senior Secondary Exam-Chemistry (313) Examination in PDF file attached with it so you can get it easily..

1. Define ‘molar mass’ of a molecular substance. 1
2. Why is Dalton’s law of partial pressure not applicable to a system of ammonia
and hydrogen chloride gas? 1
3. What would be the coordination numbers of an ion occupying (a) an octahedral
void and (b) a tetrahedral void? 1
4. Calculate the number of carbon-12 atoms in (a) 96 u and (b) 96 moles of
carbon-12 sample.

5. Define ‘ionization enthalpy’. What is the relation between atomic size and
ionization enthalpy? 2

6. Explain the conditions which make a liquid to have wetting or non-wetting
nature on the surface of a solid. 2

7. Define Hess’s law of constant heat summation. What is the basis of this law? 2

8. Name any one metal oxide which is not reduced to the metal when heated with
carbon. Which process is normally used for the reduction of this oxide ore?
Write chemical equation for the same. 2

9. (a) Write the IUPAC name of the following compound :
(b) Name the product formed when ethyne is oxidised with cold alkaline
solution of KMnO4. 2

10. If 20 g of calcium carbonate is added to a solution containing 20 g of HCl, what
substances will be present when the reaction is over and how many grams of
each of them will be there?

11. (a) What is wave number? How is it related to wavelength?
(b) Calculate the wavelength of the Balmer line corresponding to n2 4 = .
[ RH cm = - 109677 1 ] 4
313/OSS/205A 4
CH —CH—CH—CH 3 3

12. (a) 1 g of a non-volatile solute was dissolved in 100 g of acetone (molecular
mass = 58 u) at 298 K. The vapour pressure of the solution was found to
be 192•5 mm Hg. Calculate the molecular mass of the solute. The vapour
pressure of pure acetone at 298 K is 195 mm Hg.
(b) Define :
(i) Molality
(ii) Molarity 4

13. (a) How does a Bronsted-Lowry acid differ from an Arrhenius acid? Choose
the Bronsted-Lowry acids among the following species :
(b) Combustion of coal in air is an exothermic reaction. Why does coal not
burn by itself when kept in air for any period of time, but once initiated by
flame, it continues to burn? 4

Attached Files

	NIOS Senior Secondary Exam-Chemistry Exam paper-1.pdf (143.9 KB, 92 views)
	NIOS Senior Secondary Exam-Chemistry Exam paper -2.pdf (350.1 KB, 121 views)