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    <pre style="white-space:pre-line"><code>5. The Halogens and the Noble Gases                                eLearn.Punjab

Q.8 In the following sets, arrange the substances in order of the property

indicated. Give reasons.

(a) Increasing acidic character

HCIO,  HCIO2, HClO3,                      HClO4

(b) Increasing oxidizing power

F2, Cl2, Br2, I2

Q.9 What happens when bleaching powder reacts with the following
reagents dil. H2SO4,excess of conc. H2SO4, NH3, HI and CO2.

Q.10 Discuss the various commercial uses of halogens and their compounds.

Q .11 What are noble gases? Explain their inertness on the basis of their
electronic configuration.

Q.12 Write notes on the followings.
(i) Oxyfluorides of xenon.
(ii) Applications of noble gases.

Q.13 Short questions.

(i) What is â€œIodized Saltâ€?

(ii) What are Freons and Teflon?

(iii) Arrange the following ions in order of increasing size:

F-, CI-,               I-,           Br-

(iv) Why iodine has metallic luster?

(v) Which halogen sublimes to violet vapours?

(vi) Which halogen is used as an antiseptic?

(vii) Which halogen is used in water treatment to kill becteria ?

(viii) Name the gas, which is used for earthquake prediction.

(ix) Name the gas, which is used in bactericidal lamps.

                                          30</code></pre>
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