PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Strong field ligands such as CN Usually produce high spin complexes and small crystal field splitting Usually produce low spin complexes and small crystal field splitting Usually produce low spin complexes and high crystal field splitting Cannot form low spin complexes
2 Consider to violet colored compund.[Cr(OH)2)6 Cl3 and the yellow compound. [Cr(NH3)6]C;2 which of the following statements is false. Both chromium metal ions are paramagnetic with 3 unpaired electrons. [Cr(NH3)6)3+ is calculated directly form the energy of yellow light For [Cr(OH)2)6]3+ is less than for [Cr(NH3)6]3+ The two complexes absorb their complementary colors.
3 How many unpaired electron are there in a strong field iron (II) octahederal compled. 0 1 2 4
4 Which one of the following statements if false with respect to CFT. In an octahederal crystal field. the d electron on a metal ion occupy the ex of orbitals before they occupy the t98 not of orbitals. Diamagnetic metal ions cannot have an odd number of electrons Low spin complexes can be paramagnetic Low spin complexes contain strong field ligands.
5 A molecule the cannot be susperimposed on its mirror image is said to exhibit which of the following. Geometrical isomerism Optical isomerism Linkage isomerism Reactive isomerism
6 What is the oxidation number of the central meal atom in the coordination compound.[Pt(NH#)#Cl]Cl -1 0 +2 +3
7 Select the correct IUPAC nae for [Co(NH3)6 ]2+ Hexammoniacobaltate (II) ion Hexaamminecobaltate (II) ion Hexammoniacobalt (II) ion Hexaamminecobalt (II) ion
8 Select the correct IUPAC name for [FeF4(OH)2]- Diaquatrafluoriron (III) ion Diaquateratrafluoriferrate (III) ion Diaquatertrafluoroiron (I) None of these
9 Consider the coordination compound K2[Cu(CN)4] A coordinate covalent bond exists between K+ and CN- Cu2+ and CN- K_ and [Cu(CN)4]2+ C and N in Cn
10 Consider the coordination compound Na2[Pt(CN)4] the Lewis and is [Pr(CN)4]2 Na+ Pt Pt2+
11 In coordination chemistry the donor atom of a ligand is. A Lewis acid The counter ion The central metal atom The atom in the legend that shares an electron pair with the metal
12 The _________ sphere is enclosed in brackets in formulas for complex species, and it includes the central metal ion plus the coordinated group Ligand Donor Coordination Oxiation
13 Which of the following process is involved in the purification of crude metals. Liquation process Oxidation process Distillation process Electro refining
14 The process in which ore is heated generally in the presence of air, at temperature below their melting points is called. Calcination Roasting Fourth floatation besemerization
15 The process in which ore is heated generally in the absence of air, to expel water from a hydrated oxide at temperature below their melting points is called. calcination Roasting Froth floatation Bessemerization
16 The matrix is usually in the form of. Sand Limestone Rocks All
17 Which of the following method is used for the coventrating of ores. Gravity separation Magnetic concentration Fourth floatation Electrostatic concentration All
18 The process of extracting a metal in pure form its ores is known as. Crushing Grinding Dressing Metallurgy
19 Which of the following is not a property of Cr. it is brilliant silvery metal it is malleable It can take very high polish Its surface is tarnished easily
20 Ferrochrum contains Cr up to 60-70% 70-80% 80-90% 40-50%
21 Which of the following is not an ore of Cr. Chrome iron Nicollite Crocisite Chrome ochre
22 Chromium is found in nature in the the form of. Oxides Silicates Borates Sulphides
23 The process of heating to redness and then slow cooling in known as Tempering Annealing <blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;">Quenching</blockquote> Hardening
24 Which of the following is not a proper use of Ni. It is used as catalyst It is used in alloy formation It is used in the preparation of Monel metal It is attached by alkalis
25 Which of the following is not a property of Ni. it is a soft silvery white metal It is malleable and ductile It is highly magnetic It has high electrical and thermal conductivities
26 Which of the following metals form volatile carboyl with CO below 80 oC Cu Fe CO Ni
27 Which of the following process is used for the conversion of matte is to nickel. Orford process Mond's process Electrolytio process All
28 Monel metal is a alloy of Ni which constrains Ni uptown 50% 60% 70% 80%
29 In smelting process the ore is mixed with Silica Coke Limestone All
30 What % if nickel is present in the major ore Pentlandite. 22% 18% 14% 10%
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