Heat does not spontaneously flow from a colder body to a hotter one. Which of the following thermodynamics law states this?a) Zeroth law of thermodynamicsb) First law of thermodynamicsc) Second law…

1- Which of the following is not the consequence of ozone layer depletion?a) Increased ultraviolet raysb) Cyanobacteria are sensitive to UV radiation and would be affected by its increase.c) Malignant melanoma-Another…

Proclamation of Republic first constitution drafted?a) 1956b) 1958c) 1962d) None of these Pakistan Standard Time became effective at mid-night?a) 1951b) 1952c) 1953d) 1954 Who is current federal minister for communication?a) Molana…

The maximum number of electrons which can be present in a subshell can be represented by?a) 2l + 1b) 2n2c) 4l + 2d) 4l – 2 The Schrodinger wave equation is?a)…

Select the correct statement from the following option.?a) Conjugate effect is stronger than (-I) effectb) Conjugate effect is weaker than (-I) effectc) Conjugate effect is same as (-I) effectd) None of…

Which of the following is not the application of gel filtration? (PPSC 2021)?a) Purificationb) Relative molecular mass determinationc) Protein concentrationd) None of these Which solvent is usually used for SEC in…

Which of the following elements is the most electropositive?a) Bb) Cc) Cld) N Which species does not contain an sp3-hybridized atom?a) BH3a) NH4+b) NH3c) none of thesed) BH3 Photochemical smog normally…

Chromatography is a physical method that is used to separate and analyze?a) Simple mixturesb) Complex mixturesc) Viscous mixturesd)none of these In chromatography, which of the following can the mobile phase be…

Which of the following element act as an inert electrode (PPSC 2017)?a) Cub) Agc) Ptd) None If electricity is passed through a CuSO4 solution by using a Pt electrode then which…

1- Highest pH will be recorded for which of the following solutions if they are equimolar (PPSC 2017)?a) AlCl3b) LiClc) BeCl2d) BaCl2 2- On increasing the concentration of reactants in a…