PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Which can be purified by sublimation F2 Cl2 Be2 I2
2 What element is the most abundant by mass in the Earth's crust. Fe H O K
3 Which of the following is the active ingredient in ordinary household bleach. HCl Cl2 NaCl NaCIO
4 Which of the following halogen exist in solid state. F2 I2 Cl2 Br2
5 HCIO4, HNO3 and HCL are all strong acids in aqueous solution inglacial acetic acid medium, their acid strength is such that. HCIO4 > HCL > HNO3 HNO3 > HCIO4 > HCl HCl > HCIO4 > HNO3 HCl > HCIO4 > HNO3
6 Which of the following is a pseudohalide. I3- IF7 CN- ICI
7 Pick out the incorrect statement for CIF3 It has trigonal planar geometry It is used to make gaseous UF6 which is useful in making enriched U-235 fuel It is used as powerful fluorinating agent for inorganic compounds CIF2 has been used as fuel in short range rockets reating with hydrazine.
8 The following oxo acids have been arranged in the order decreasir acid strength identify the correct order. III > IV > II > I III > II > I >IV I > II >III > IV IV > III > II > I
9 Which of the following has the maximum ionic character. HF HCl HI HBr
10 Which of the following compounds has highest boiling point. HI HF HBr HCl
11 Pick out incorrect statement regarding HF It is used for making chlorofluorocarbon used as refrigerating fluids and as propellants in aerosols It is used in making ASIF3 and synthetic cryolite Aqueous HF is used for etchine glass HF does not react with B2O3 even in presence of conc. H2SO4
12 Which is the strongest reducing agent. HF HCl HBr HI
13 The halide which is inert to water is PCl5 SiCl4 BCl3 SF3
14 Which one of the following has the biggest electron affinity. F2 Cl2 Br2 I2
15 The fluoride tooth paste contains SnF2 and Sn2P2O7 NaF CaF2 None of these
16 Chlorine gas acts as a bleaching agent only in presence of. dry air Moisture Sunlight Pure oxygen
17 Which of the following is a false statement. Halogens are strong oxidizing agent Halogens show only (-I) Oxidation state Hf molecules from intermolecular H-Bonds Fluorine is highly reactive
18 Which of the following is the strongest oxidant. F2 Cl2 br2 I2
19 Which number of halogen family does not show positive oxidation state. Fluorine Chlorine Bromine Iodine
20 Which of the halogens has lowest bond energy. Cl2 Br2 F2 I2
21 pKa value of hyponitrous acid is. -7.0 8.9 4.1 6.6
22 Example of peseudohalonge group. Cyanogen Thiocyanogen Selenocyanogen All above
23 CIF is Chlorine monoflouride Fluourine Monochlorine fluoride Monofluorine chloride
24 Inter halogens are of types. 3 4 5 6
25 Highly dangerous acid and produces severe wounds on the skin. HCIO HCIO2 HCIO3 HCIO4
26 HCIO2 gives the structure of a. Linear Angular trigonal pyramidal Tetra hddral
27 HCIO evolves Cl2 and O2 when dissolve Ca Ni Cu Any of above
28 Increasing oxygen contents in oxyacids leads to. An increase in thermal stability An increase in acid strength A decrease in oxidizing power All above
29 The oxidation state of HCiO4 + 7 + 3 + 5 + 1
30 iodine is used as a Photography Manufacture of dyes Analgesic All above
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