PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 Which of the following analytical technique is used for the separation of an interfering substance or analyte from the mixture. Precipitation Distillation Electrode position All above these
2 Which of the following physical property forms the basis of radio chemicals methods of analysis. Absorption of light Emission of light Radioactivity Thermal conductivity
3 Which of the following method of analysis is based on diffraction of radiation. Mass spectrometry Polarography Potentiometry Raman scattering
4 Which of the following analytical technique is based on the refraction of radiation. Conductometry Refractometry Coulometry Potentiaometry
5 Which of the following analytical method is based on the rotation of light ratiation Refractomerty Polarimetry Interformetry Polarography
6 Which of the following analytical method is based on scattering of radiation. Emission spectroscopy Colorimetry Turbidimetry Polarimetry
7 Which of the following analytical technique is based on the emission of light radiation. Flame photometry Atomic absorption spectrophotometry Raman spectroscopy Conductometry
8 Which of the following technique is based on the absorption of light radiation. Spectrophotomerty Colorimetry NMR All the above technique
9 The current voltage characteristics forms the basis of. Thermal analysis Potentiometry Polarography Colorimetry
10 Coulometry is based on the measurement of Electrical current Electrical potential Electrical conductance Dielectric constant
11 Potentiometry is based on the measurement of which physical property. Electrical conductance Electrical potential Thermal conductance Current
12 Conductometry is based on Electric current Electrical potential Absorbance Electrical conductance
13 Which property is used in volumetric methods of analysis. Density Viscosity Volume Molar volume
14 Gravimetric method is based on which of the following property. Volume of a liquid Volume of gas Mass of substance Viscosity
15 Which of the following physical properties is employed int he analytical methods. Electric current Transition temperature Surface tension All above
16 The process of determining amounts of each of the components in a sample of matter is termed as. Gravimetric analysis Coulometric analysis Quantitative analysis Qualitative analysis
17 The process of identifying the component present in a sample is called. Quantitative analysis Qualitative analysis Volumetric analysis Gravimetric analysis
18 The branch of chemistry which deals with the analysis of chemical products is known as. Physical chemistry Organic chemistry Inorganic chemistry Analytical chemistry
19 When the concentration of reactant molecules is increased the rate of reaction increases. The best explanation is As the reactant concentration increases. The average kinetic energy of molecules increases. The frequency of molecular collisions increases The rate constant increase The activation energy increases
20 Which statement is false. If a reaction is thermodynamically spontaneous it may occur rapidly If a reaction is thermodynamically spontaneous it may occur slowly. Activation energy is a kinetic quantity rather than a thermodynamic quantity. If a reaction is thermodynamics spontaneous, it must have a low activation energy.
21 A catalyst Actually participates in the reaction Changes the equilibrium concentration of the products Does not affect a reaction energy path Always decreases the rate for a reaction
22 What is the activation energy of a reaction whose rate constant increases by a factor of 100 upon increasing the temperature from 300 K to 360 K. 27 35 42 69
23 Suppose the activatin energy of a certain reaction is 250 kj/mol, If the rate constant at T1 =300 K is k1 and the rate constant at T2= 320 K is ks, then the reaction is ______ times faster at 320 K than at 300 K 3 x 10<sup>-29</sup> 0.067 525 15.0
24 A correct reaction mechanism for a given reaction usually is. The same as the balanced chemical equation Obvious if its heat of reaction is known Sometimes difficult to prove Obvious if the activation energy is known
25 If the activation energy in the forwarded direction of an elementary step is 52 kj and the activation energy in the reverse direction is 74 kj. What is the energy of reaction Delta E for this step 22 Kj -22 kj 52 kj -52 kj
26 If reaction A has an activation energy of 250 kj and reaction activation energy of 100 kj, which of the following statements must be correct. If reaction A is exothermic and reaction B is endothermic then reaction A is favored kinetically At the same temperature the rate of reaction B is greater than the rate of reaction A The energy of reaction A must be greater than the energy of reaction B. The energy of reaction B must be greater than the energy of reaction A
27 The half life for a first order reactions 32 s, What was the original concertation if after 2.0 minutes, the reactant concentration is 0.062 M. 0.84 M 0.069 M 0.091 M 0.075 M
28 The decomposition of dimethyl ether at 504 oC is first order with a half -life of 1570 second. What fraction of an initial amount of dimethyl ether remain after 47-10 seconds. 1/3 1/6 1/8 1/16
29 Given A + 3B ____________ 2C + D
This reaction is first under with respect to reactant A and second order with respect to reactant B . If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would _____ by factor of _____________
 Increase ,2 Decrease ,2 Increase ,4 Decrease ,4
30 The speed of a chemical reaction Is constant no matter what the temperature is. Is independent of the amount of contact surface of a solid involved Between gases should is all cases be extremely repid because the average kinetic energy of the molecules is great Between ions in aqueous solution is extremely rapid because there are no bonds that need to be broken
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