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    <pre style="white-space:pre-line"><code>5. The Halogens and the Noble Gases                                           eLearn.Punjab

(iv) Which halogen will react spontaneously with Au(s) to produce Au3+?

(a) Br2        (b)F2                 (c) I2            (d) Cl2

(v) The anhydride of HCIO4 is :

(a) CIO3       (b) ClO2              (c) Cl2O5         (d) CI2O7

(vi) Bleaching powder may be poduced by passing chlorine over:

(a) calcium carbonate                           (b) hydrated calcium sulphate

(c) anhydrous calcium sulphate                         (d) calcium hydroxide

(e) magnesium hydroxide

(vii)Which is the strongest acid?

(a) HCIO         (b) HClO2           ( c ) HClO3                (d) HClO4

(viii) Which halogen occurs naturally in a positive oxidation state?

(a) Fluorine (b) Chlorine (c) Bromine (d) Iodine

(ix) An element that has a high ionization energy and tends to be chemically

inactive would most likely to be:

(a) an alkali metal                          (b) a transition element

(c) a noble gas                              (d) a halogen

(x) Which of the following represents the correct electronic configuration

of the outermost energy level of an element of zero (VIIIA) group in the

ground state.

(a) s2p2         (b) s2p4                    (c) s2p5  (d) s2p6

Q.4 What is bleaching powder? How it is prepared commercially? Give its
uses.

Q.5 (a) Discuss the oxides of chlorine.
(b) What are disproportionation reactions? Explain your answer with an
example.

Q.6 Discuss the system of nomenclature used for oxyacid of halogens.
Support your answer with examples.

Q.7 (a) How the halogen acids are ionized in water?
(b) Why HF is weaker acid than HCl?

                                     29</code></pre>
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