PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 iodine is used as Tincture of iodine Iodex and antiseptic Treatment of goiter All above
2 Iodine is a grey black solid and its vapours are in color Grey Black Yellow Violet
3 Bromine is used as Fungicides Herbicides Germicides Insecticides
4 Bromine is soluble in Alcohol Water Chloroform All above
5 The vapours attacks the eyes and mucous membrane of nose and throat F Cl I Br
6 The bromine produced on commercial scale may contain impurities of. Water Chloride iodine All above
7 Chlorine is used in Sterilizatin of water Extractionof gold Bleaching of cotton All above
8 Used for sterilizationof drinking water F Br Cl I
9 Greenish yellow gas with pungent irritating odour Chlorine Fluorine Iodine Bromine
10 On industrial scale chlorine is prepared by Dennis method Deacon's process Plantner's process Aludels process
11 The electrolytic method super passes all other methods due to. Furity Cheapness Easy available All above
12 Separation of isotopes of uranium is carried out by CaF2 SF6 HF All above
13 Fluorine finds considerble use of DDFT which is used as. herbicide Fungacide Insecticide Nomatocides
14 Fluorine is. Powerful oxidizing agent Most reactive element Used as refrigerants All of above
15 Fluorine form Fluorides reacting with Metals Non metals Metalloide Any of above
16 In Dannis's method the end of the copper caps into which graphite electrode are fixed with cement. Portiant Bakelite Asbestos All of above
17 Among all halogens no oxyacid of the following is known F Cl Br I
18 Flourine differs from the other members of its own group due to. Its small size and low bond energy Its higher electornegativity None-availability of d-orbitals in its valence shell All the above
19 All the halogen form oxyacide, except Florine Chlorine Bromine Iodine
20 In their ionic compounds halogens exhinit the oxidation states of. -1 -2 -3 -4
21 The high oxidizing power of halogens is favored by. Low heat od dissociation of X2 A high electron affinity of the atom A higher hydration energy of the ion All of above
22 Has the highest value of electronegativity F Cl Br I
23 All halogens exist as covalent molecules. Monoatomic Daitomic Triatonic Tetra atomic
24 Group VII A of periodic table consist of elements. 4 <div>5</div> 6 7
25 A boy accidently splashes a few drops of conc. H2SO4 on his cotton shirt. A few minutes later, the splashed part blacken and holes appear.This is because the sulphuric acid. Heats up the cotton so that it burns Dehydrates the cotton Causes cotton to react with oxygen of the air Removes the elements of water from cotton
26 Pick out the ideal conditions needed for the manufacture of H2SO4 by contact process. Low temperature high pressure and high concentration of reactants Low temperature , low concentration of reactants and low pressure High temperature high pressure and high concentration of reactants Low temperature, low pressure and high concentration of reactants.
27 Hypo is used in photography to. Reduce AgBr to metallic silver Remove silver a silver salt Remove undecomposed silver bromide as soluble complex Remove reduced silver
28 Which of the following represent the fuming sulphuric acid H2S2O4 H2S2O3 H2S2O6 H2S2O7
29 Which of the following compounds is must acdic. H2O H2S H2Se H2Te
30 Which one of the following has the highest boiling point. H2O H2S H2Se H2Te
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