Quiz Medium 5 Categories Quizzes 0 Quiz Medium 5 1 / 25 Human hearing is sensitive to frequency in the range of about 10-20,000 Hz 10,000 Hz - 30,000 Hz 10-10,000 Hz 10,000 Hz - 20,000 Hz None of the above 2 / 25 Which of the following methods is used for the concentration of ores? Froth-floatation All Gravity separation Magnetic concentration Electrostatic concentration 3 / 25 Pi bond is formed By transference of electrons By the overlapping of atomic orbitals on internuclear axis By overlapping of s-orbitals with p-orbitals By sidewise overlapping to half filled p-orbitals 4 / 25 The range of sound pressure for uncomfortable level is 130-140 dB 80-90 dB 10-20 dB 100-120 dB 50-90 dB 5 / 25 Ionic compounds in general possess both High melting point and non-directional bonds High melting points and low-boiling points High solubility in polar and non-polar bonds Directional bonds and low-boiling points 6 / 25 The most abundant metal in earth's crust is Al Fe Ca Ti 7 / 25 Ci.2-Butene on reaction with bromine gives 2,3-dibromobutane which is Racemic Reaction Dextoro isomer Meso-isomer Levoisomer 8 / 25 The geometry of the molecule is primarliy decided br No. of k bonds around the central atom Bond pairs around the central atoms No. of bond pairs as well as lone pairs around the central atoms No. of lone pairs on central atom 9 / 25 The concentration required to give a signal equal to three times the standard deviation of the baseline (blank) is called Detection limit Signal to noise ratio None of the above Sensitivity 10 / 25 RNA is involved in the synthesis of Nucleic acid Proteins Fats Carbohydrates 11 / 25 Which configuration has lowest potential energy? Skew Eclipsed All have same energy Staggered 12 / 25 Smoke Volatility index is expressed as? Smoke point = 3 42 x (percentage distilled at 204°C) Smoke point = 2.42 x (percentage distilled at 204°C) None of these Smoke point = 1.42 x (percentage distilled at 204°C) Smoke point = 0.42 x (percentage distilled at 204°C) 13 / 25 In B2H6 molecule There exist two (three-centre Two-electron) bonds between the boron atoms. All the B-H bonds are normal covalent bonds There exists a direct B-B α-bond All the atoms are in one plane 14 / 25 A unit cell having dimensions, a = b != c, a= ß = ý = 1200 is known as Hexagonal Cubic Monoclinic Trigonal Tetragonal 15 / 25 Brass is an alloy of Aluminium and Nickel Copper and Tin Aluminium and copper Copper and Zinc Lead and Tin 16 / 25 Anticodons in t-RNA's corresponding to different amino acids are Same as in codons Sometimes as (A) and (B) both Complimentary to codons Haphazard in arrangement 17 / 25 The correct order of increasing acid strength is H2N2O2 < HNO3 < HNO2 HNO3 < H2N2O2 < HNO2 H2N2O2 < HNO2 < HNO3 HNO2 < HNO3 < H2N2O2 18 / 25 Which of the followings have +3 oxidation states B and In Al and TI In and TI B and Al 19 / 25 Which of the following can act both as a Bronsted acid and a Bronsted base? NH3 OH- HCO3- Na2CO3 20 / 25 The current-voltage characteristics forms the basis of Potentiometry Thermal analysis Polarography Colorimetry Condtuctometry 21 / 25 According to Lechatlier's principle. the formation of NO2 at equilibrium in the reaction 2NO +O2 ↔ 2NO2 + heat should be favoured by High T and high P High temperature Low T, high P Low T and low P 22 / 25 Layer of C-atom in graphite are held together by Double Bonds Van der Waal's Forces Ionic Bonds Free electrons Covalent bonds 23 / 25 The branch of chemistry which deals with the analysis of chemical products is known as Physical chemistry Analytical chemistry Organic chemistry Inorganic chemistry polymer chemistry 24 / 25 Which of the following statement is incorrect? An alloy is a mixture of two or more metal and non-metal elements that have metallic properties An amalgam is an alloy containing Hg An alloy is a mixture of two or more metals An alloy has a fixed composition 25 / 25 . In isoquinoline the nucleophilic substitution occurs, readily at 3-position 5-position 4-position 1-position Your score is Share: Quiz Dad Previous post Quiz Medium 4 October 1, 2022 Next post Quiz Hard 1 October 1, 2022 You may also like Quiz Hard 5 1 October, 2022 Quiz Hard 4 1 October, 2022 Quiz Hard 3 1 October, 2022
