Question

Mat.
se
(1)
1. Round off 0.0525 to a number with two significant figures.
2. The mass of 2 moles of ammonia gas is .....
3. The allotrope of carbon with the highest thermodynamic stability is......... (1)
4. Calculate the amount of CO 2 (g) produced by the reaction of 32g of CH 4 (g) and 32g
of 0, (g).
5. Hydrogen combines with oxygen to form two different compounds, namely water
(HO) and hydrogen peroxide (H2O2).
(a) Which law is obeyed by this combination?
(b) State the law.
6. What are zeolites? Give any two uses of zeolites.
(2)
(2)
7.
(a) What is water gas?
(1)
(b) Inorganic benzene is ..
8. Draw the structure of Diborane. Write a note on the nature of bonds present in it.(2)
9. A reaction mixture for the production of NH 3 gas contains 250 g of N, gas and 50 g of
H gas undersuitable conditions. Identify the limiting reactant if any and calculate the
mass of NH, gas produced
(3)
10. Atoms have very small mass and so usually the mass of atoms are given relative
to a standard called atomic mass unit.
(a) What is atomic mass unit (amu)?
(b) Calculate the mass of NaOH required to make 500 ml of 0.5M aqueous solution.
(Molar mass of NaOH =40)
11.Carbon has many allotropes.
(a) Write the name of any two allotropic forms of carbon.
(b) Briefly explain the structure of any one of the above mentioned allotrope. (2)
12. Empirical formula represents the simplest whole number ratio of various atoms
present in a compound.
a) Give the relation between empirical formula and molecular formula (1)
b) An organic compound has the following percentage composition C = 12.36%, H =
2.13%, Br = 85%. Its vapour density is 94. Find its molecular formula.
c) What is mole fraction?
13. Give reason for the following:
a) CO, is a gas while sio, is a solid.
b) CCI. cannot be hydrolyzed but Sich can be hydrolyzed.
c) Borax bead test can be used to identify metaborates in the laboratory
d) Graphite is used as a lubricant in machines.
(1​

Answer 1

Answer:

oooooooooooooooooooooooooooooh pura ques paper puch rhe ho lya