PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 The principal ores of copper are Copper sulphides Copper oxides Both sulphides and oxides Copper carbonate
2 Copper occurs in nature as. Native Combined Both native and combined None of the above
3 Which of the following is the second anciently known metal. Nickel Copper Gold Silver
4 Carbon in wrought iron is present as Silicon carbide Iron carbide cementite Graphite Partly as iron carbide and partly as graphite
5 Stainless steel contains Fe+Cr+Ni Fe+Ni+Cu Fe + Cr+ Cu Cu + C + Ni
6 If steel is heated to a temperature well below red heated and is then cooled slowly the process is called. Annealing Quenching Tempering Nitriding
7 In the extraction of iron, the furnace change consists of iron ore, coke and limestone. The function of limestone is to act as. An oxidizing agent A reducing agent Flux Slag
8 Pig iron is also called. Cast iron Steel Wrought iron Stainless steel
9 In the fourth flotation process for the purification of ores, the ore particles floats because. They are light Their surface is not easily wetted by water They bear electrostatic charge They are insoluble
10 The most stable oxidation state of chromium is. +6 +3 +4 +2
11 Zeigler Natta catalyst is. Pt/PtO TiCl4/Al(C2H5)3 Pt/Rh Pt
12 Transition elements, in general, exhibit the following properties, except one, Name that property. Variable oxidation state Natural radioactivity Tendency to form complexes Formation of alloys
13 Which of the following statements is false about transition metals. They form complexes They show variable valency All transition metal compounds are paramagnetic They form coloured ions
14 Which one of the following ionsis colourless. Cu+ Ni2+ Co2+ Fe3+
15 Colour in transition metal compounds in attributed to Small sized metal ions Absorption of light in UV region Complete ns sub shell incomplete (n-1) sub shell
16 The maximum oxidation shown by managanese is. +2 +7 +4 +5
17 Variable oxidation states is shown by Normal eleemnts Metallic elements Non metallic elements Transition elements
18 Zinc oxide is. A basic oxide An amphoteric oxide An acidic oxide A neutral oxide
19 The rusting of iron is catalysed by which of the following. Fe O2 Zn H+
20 Finely divided iron combines with CO to give. Fe(CO)5 Fe2(CO)9 Fe(CO)12 Fe(CO)6
21 In the metallurgy of iron, when limestone is added to the blast furnace, the calcium ion ends up in. Slag Gangue Metallic calcium Calcium carbonate
22 Pick out incorrect statemtn about K2r2O7 It oxidizes acidified solution of H2S to S It oxidizes Ki TO i2 It oxidizes HCl to Cl2 It gives oxygen, when treated with cold conc. H2SO4
23 Pick out the incorrect statement about K2Cr2O7 It is thermally stable It dissolves in alkali to form chromate It oxidizes acidified FeSO4 solution to Fe2(SO4)3 It is used as cleansing agent for glassware, etc. when mixed wiht cold conc. H2SO4
24 The atomic number of potassium is 19 and that of mangness is 25 Although the colour of MnO4 is dark violet yet the K+ is colourless this is due to the fact that. Mn is a transition element while K+ is not [MnO4]- is negatively charged while K+ has positive charge The effective atomic number of Mn is [MnO4]- is 26: while for K+ the atomic number is 18 The Mn is a high positive oxidation state allows charge transfer transitions.
25 The secondary valency of Conc. CoCl3. 6NH3. 2 4 6 8
26 If the absorbed light is green the transmitted light will be Purple Orange Violet Black
27 [Ti(OH2)6]3+ gives colour Green Red Purple Blue
28 The maximum absorption in [Ti(OH)2)6 3+ take place at wavelength of. 4000 A<sup>o</sup> 5000 A<sup>o</sup> 6000 A<sup>o</sup> 10000 A<sup>o</sup>
29 The solution of the transition metal complexes having one or more unpaired electrons in the d-orbital are. Coloured Colourless White None of above
30 When metal orbital are rotated in octahedral field the following representation obtained. t2 g + lg a1 g t 1 u All above
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