Practice Questions
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Q78.Number of atoms in 558.5 gram Fe (at.wt. of Fe = 55.85 g mol−1 ) is (1) twice that in 60 g carbon (2) 6.023 × 1022 (3) half that in 8g He (4) 558.5 × 6.023 × 1023
Q86.Value of gas constant R is (1) 0.082 litre atm (2) 0.987cal mol−1 K−1 (3) 8.3 J mol−1 K−1 (4) 83 erg mol−1 K−1
Q87.Kinetic theory of gases proves (1) only Boyle’s law (2) only Charles’ law (3) only Avogadro’s law (4) all of these
Q93.For the reaction CO(g) + (1/2)O2( g) = CO2( g), Kp/Kc is (1) RT (2) (RT)−1 (3) (RT)−1/2 (4) (RT)1/2 Q94.1 M NaCl and 1 M HCl are present in an aqueous solution. The solution is (1) not a buffer solution with pH < 7 (2) not a buffer solution with pH > 7 (3) a buffer solution with pH < 7 (4) a buffer solution with pH > 7
Q95.Species acting as both Bronsted acid and base is (1) (HSO4)−1 (2) Na2CO3 (3) NH3 (4) OH−1
Q97.The solubility of Mg(OH)2 is S moles/litre. The solubility product under the same condition is (1) 4 S3 (2) 3S 4 (3) 4 S2 (4) S 3
Q98.How do we differentiate between Fe3+ and Cr3+ in group III? (1) by taking excess of NH4OH solution (2) by increasing NH4+ ion concentration (3) by decreasing OH− ion concentration (4) both (b) and (c)