Question

How many moles of a gas woud be present when the gas is trapped within a 37.0 L vessel
at 80°c and a pressure of 2:50 atm?
3
- 16-8g NaHCO3 is treated with 12:0g CH2COOH. The residue was found to weight 20-Og.
Determine the mass of CO, excaped in the reaction.
3
R, 5g of a smaple of calcium carbonate, contaminated with a volatile impurity, left a residue
of 2.2g on strong heating. What is the percentage of pure CaCO3 in the sample?
(Ca 40, C = 12, O = 16)
3
3 Write two differences between a convex lens and a concave lens. Is eye lens a convex or
concave lens.
2+1
R How will you arrange two convex lenses, so that a parallel beam of rays incident on the
3
first, emerge as a parallel beam from the second?
-4 The R.I of flint glass is 1.65 and that of alcohol is 1-36 with respect to air? What is the
R.I of flint respect to alcohol ?
3
5 A ray of light is refracted through a prism of angle 70°. If the angle of refraction in the
glass at the first face is 28°, what is the angle of incidence in the glass at the second
face?
3
OR Rising or setting sun is red. Explain.
3
7.6 What current must flow if 0-24 coulomb is to be transferred in 15ms?
3
OR State Joule's laws of heating effect of current.
3
1.7 An electric heater works both in AC and DC line but Barlow's wheel works only in
DC. Why?​

Answer 1

Explanation:

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