Which of the following is not the application of gel filtration? (PPSC 2021)? a) Purification b) Relative molecular mass determination c) Protein concentration d) None of these
Which solvent is usually used for SEC in our lab? (PPSC 2015)? a) tetrahydrofuran b) toluene c) water d) None of these
At the same temperature, the average molar kinetic energy of N2 and CO is? a) KE1 > KE2 b) KE1 = KE2 c) KE1 < KE2 d) None of these
Which law states that the volume of an ideal gas at constant pressure is directly proportional to its absolute temperature? a) Boyle’s law b) Joule’s Law c) Avogadro’s law d) Charles’s Law
Which of the following contains an atom (other than hydrogen) which lacks an octet of valence electrons? (PPSC 2020)? a) NH3 b) H3O+ c) NH4+ d) BH3
Which isomerism is not exhibited in alkene? PPSC 2017? a) geometrical b) metamerism c) chain isomerism d) position isomerism
Which of the following is most basic? (PPSC 2021)? a) CH3NH2 b) H2O c) NH3 d) CH3OH
Among the following the maximum covalent character is shown by the compound. (PPSC 2020)? a) MgCl2 b) FeCl2 c) SnCl2 d) AlCl3
What is the value of universal gas constant in Nernst equation when the potential is given in volts? (PPSC 2015)? a) 8.314 J mol-1K-1 b) 0.0821 L atm mol-1K-1 c) 8.205 m3 atm mol-1K-1 d) 1.987 cal mol-1K-1
Which of the following is true in the case of the Zn-Cu cell? (PPSC 2020)? a) The flow of electrons takes place from copper to zinc b) E0 red of the copper electrode is less than that of a zinc electrode c) Zinc acts as an anode and copper as a cathode d) All are correct
Chromatography is a physical method that is used to separate and analyse __? a) Simple mixtures b) Complex mixtures c) Viscous mixtures d) none of these
Which of the following is a special adsorbent used in gas-solid chromatography? a) Molecular sieves b) Silica gel c) Alumina d) None of these
Which of the following is not a desirable feature of the ovens used in gas chromatography? a) It must have a fast rate of heating b) Power consumption should be kept low c) It must have maximum thermal gradients d) None of these
In chromatogram, the position of peaks on the time axis can be used to determine which of the following? a) Components of the sample b) Column resolution c) Column efficiency d) none of these
The correct order for the basic features of a mass spectrometer is…? a) acceleration, deflection, detection, ionization b) ionization, acceleration, deflection, detection c) acceleration, ionization, deflection, detection d) None of these
Which of the following metals does not form amalgams? a) Zinc b) Copper c) Iron d) Magnesium
Find the fraction of the total pressure exerted by hydrogen if it is mixed with ethane in an empty container at 25℃? a) 15/16 b) 1/16 c) 1/2 d) 1
Maximum deviation from ideal gas behaviour is expected from __ gas? a) CH4 b) NH3 c) N2 d) None of these
The heat released at the time of condensation is called as? a) Sublimation heat b) Condensation Heat c) Latent Heat d) None of these
Which of the following is not conjugated unsaturated system.? a) Allyl radical b) Allyl cation c) 1,3-butadiene d) 1-penten-4-yne
