PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Group IV A consist elements. 3 4 5 6
2 When Phosphate rock Ca3(PO4) 2 is converted to phosphorus. One of the products of the reaction is water Sulphuric acid is added to generate insoluble calcium sulphate Hydrogen is used to reduce the phosphate to phosphorus Silica is added to form a calcium silicate slag
3 Phosphoric acid is the most important of the phosphorus oxy acids. Industrially phosphoric acid is prepared by. The Ostwald process The Haber's process The reaction of phosphate rock with sulphuric acid The reaction P4O10 with water.
4 The Ostwald process is the main method for the manufacture of nitric Acid in the fist step in this process is. Nitrogen and hydrogen react to form NH3 Ammonia is burned in O2 to generate N2 and H2O Nitrogen and oxygen react to form NO2 Ammonia is burned with O2 to generate NO and H2O
5 Phosphorus has the oxidation state of +3 in Orthophosphoric acid Hypophosphoric acid Metaphosphoric acid Orthophosphorus acid
6 The strongest acid is. HNO2 HNO3 H2N2O2 HNOS
7 White Phosphorus is kept under Cold water Ammonia liquor Ethanol Kerosene
8 The oxidation state shown by phosphorus is. - 3 + 3 + 3 and +5 -3 ,+ 3 and +5
9 Which of the following does not form stable diatomic molecule. Nitrogen Phosphorus Hydrogen Oxygen
10 Which of the following elements display maximum tnedency to form P Pi - p PI multiple bonds with itself and with carbon and oxygen. N p Bi As
11 Which of the following elements of group 15 is a typical metal. P As Bi Sb
12 Which of the following can be used as drying agent of ammonia. CaO Anhydrous CaCl2 P2O5 Conc. H2SO4
13 Pick out incorrect statement. NF3 molecule has trigonal pyramidal structure. It is practically incoluble in water and is only hydrolyzed, an electric spark is passed through a mixture with water vapour. Dipole moment of NF3 is more than that of NH3 Nitrogn (III) oxide (N2O3) is an acidic oxide.
14 Which trihalide is not hydrolysed by water NF3 NCl3 PCl3 AsCl3
15 Which of the following trihalides of nitrogen behaves as the weakest base. NF3 NCl3 NBr3 NI3
16 The basic strength of hydrides of group 15 elements very in the following order. NH3 > PH3 > AsH3 > SbH3 >BiH3 PH3 > NH3 > AsH3> SbH3 > BiH3 BiH3> NH3 >PH3 > AsH3 > SbH3 NH3 > PH3 > SbH3 > AsH3 > BiH3
17 Arrange the hydrides group 15 in the order of increasing boiling point. PH3 < AsH3 <SbH3 < BiH3 <NH3 PH3 <AsH3< SbH3< NH3 < BiH3 PH3 < AsH3<NH3 <SbH3<BiH3 NH3 < PH3 < AsH3 < Sb H3 < BiH3
18 Arrange the hydrides of group 15 in the correct order of reducing nature. NH3 < PH3 < AsH3 < Sb H3 < BiH3 NH3 > PH3 >AsH3 >Sb H3 > BiH3 PH3 < AsH3 < SbH3 < BiH3 < NH3 PH3 > AsH3 > SbH3 > BiH3 > NH3
19 The correct order of thermal stabilities of hydriedes of group 15 is. NH3 > PH3 > AsH3 > BiH3> SbH3 NH3 > PH3 >AsH3 > SbH3> BiH3 NH3 < PH3 < SbH3 > AsH3 > BiH3 BiH3 > Sb H3 > AsH3 > PH3 > NH3
20 Which of the following pentahalides is not formed. NF5 PF5 AsF5 BiF5
21 Pick out the incorrect statement. Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure. Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong. The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.
22 Phosphorus normally exhibit a covalency of. +1 and +2 +2 and +3 +3 and +4 +4 and +5
23 Nitrogen (N2)) is relatively unreactive because. Its electronegativity is high Its dissociation energy is large Its atomic radius is small It is the first element of group 15
24 After assimilation urea leaves behind in the soil NH3 CO2 Both A and B None of above
25 Ammonia is utilized for Manufacture of urea Oxidation to nitric acid Manufacture of ammonium sulphate All above
26 In urea the amount of nitrogen is 82.0% 46.0% 33.0% 21.0%
27 Urea is fertilizer Nitrogen fertilizer Potash fertilizer Phosphorous fertilizer Complete fertilizer
28 Commercial or the phosphoric acid is pure. 37.0% 82.98% 88.25% 90.12%
29 Formula of orthophosphoric acid. H2PO4 H3PO3 H3PO2 H4P2O5
30 Acid rain effects Human being Crops Aquatic life All above
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