MDCAT Preparation MCQs
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Answer: In K2Cr2O7, 2(+1) + 2x + 7(-2) = 0, solving gives x = +6 for chromium.
Answer: Concentrated H2SO4 has a strong affinity for water and is widely used as a dehydrating agent.
Answer: Boiling point increases with molecular weight in alkanes due to stronger van der Waals forces.
Answer: Copper reduces concentrated H2SO4, producing SO2 gas along with CuSO4 and water.
Answer: NH3 has three bonding pairs and one lone pair on nitrogen, giving a trigonal pyramidal shape.
Answer: The hydroxyl group is on carbon 2 of a three-carbon chain, giving propan-2-ol.
Answer: Chlorine replaces hydrogen atoms in methane via a free radical substitution mechanism.
Answer: Acidified K2Cr2O7 is a mild oxidizing agent that oxidizes ethanol to ethanal under distillation.
Answer: Copper has an anomalous configuration [Ar] 3d10 4s1 due to the stability of a fully filled 3d subshell.
Answer: HCl is polar without H bonded to N, O, or F, so dipole-dipole forces are dominant.
Answer: The thermite reaction between aluminium and iron oxide produces molten iron used in welding.
Answer: Noble gases have low boiling points due to weak van der Waals forces between their atoms.
Answer: From 2H2 + O2 to 2H2O, 4 moles of H2 produce 4 moles of H2O since the ratio is 1:1.
Answer: Water has a bent shape with two lone pairs on oxygen that compress the angle to about 104.5 degrees.
Answer: Dry ice (solid CO2) sublimes at low temperature and is used as a refrigerant.
Answer: N2 has all paired electrons in its molecular orbitals, making it diamagnetic.
Answer: Tollen\'s reagent oxidizes aldehydes but not ketones, producing a silver mirror with aldehydes.
Answer: A neutral solution has equal concentrations of H+ and OH- ions, giving a pH of 7.
Answer: Boiling point increases with molecular weight in alkanes due to stronger van der Waals forces.
Answer: Electronegativity decreases down a group, so F > Cl > Br > I.