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Showing 3001 to 3025 of 3046 questions (page 121 of 122).

3001. The bond angle in the ammonium ion is about

A. 104.5 degrees B. 90 degrees C. 107 degrees D. 109.5 degrees E. 120 degrees

3002. The carbonate ion is

A. pyramidal B. bent C. tetrahedral D. linear E. trigonal planar

3003. The nitrogen atom in ammonia is

A. sp2 hybridized B. sp hybridized C. sp3d hybridized D. sp3 hybridized E. unhybridized

3004. The two oxygen to oxygen bonds in ozone are of equal length because of

A. ionic character B. hydrogen bonding C. resonance between two equivalent structures D. sp3 hybridization E. free rotation

3005. The electron pair geometry and molecular geometry differ whenever the central atom has

A. only bonding pairs B. one or more lone pairs C. a double bond D. hydrogen atoms attached E. an expanded octet

3006. Bond formation is always

A. spontaneous only at high temperature B. athermal C. endothermic D. exothermic E. accompanied by an increase in enthalpy

3007. The enthalpy of hydration of an ion is the enthalpy change when one mole of the gaseous ion

A. is oxidized B. is formed from the element C. is dissolved in a large excess of water D. loses an electron E. is vaporized

3008. At equilibrium, the rates of the forward and reverse reactions are

A. unrelated B. both zero C. in the ratio of the stoichiometric coefficients D. increasing steadily E. equal and non-zero

3009. A catalyst affects a reversible reaction by

A. reducing the time taken to reach equilibrium B. increasing the yield of product C. shifting the equilibrium right D. raising the equilibrium constant E. lowering the enthalpy change

3010. A strong electrolyte in aqueous solution is one that is

A. a poor conductor B. almost completely ionized C. molecular in solution D. sparingly soluble E. always an acid

3011. On the usual pH scale at 25 degrees Celsius, values run from

A. 0 to 7 B. 7 to 14 C. 0 to 14 D. 1 to 10 E. minus 7 to plus 7

3012. Increasing the concentration of a reactant in a system at equilibrium

A. stops the reaction B. changes the equilibrium constant C. shifts the equilibrium towards the reactants D. has no effect E. shifts the equilibrium towards the products

3013. The scattering of a light beam by a colloidal dispersion is known as the

A. Tyndall effect B. Doppler effect C. Zeeman effect D. Brownian effect E. Raman effect

3014. A colloid differs from a true solution mainly in the

A. electrical charge of the solvent B. colour of the dispersion C. temperature required D. size of the dispersed particles E. presence of a solvent

3015. Milk is an example of

A. a gel B. a true solution C. a foam D. an aerosol E. an emulsion

3016. A solution that contains more dissolved solute than its equilibrium solubility at that temperature is called

A. supersaturated B. unsaturated C. saturated D. colloidal E. dilute

3017. In standard cell notation, the anode half cell is written

A. in the middle B. on the left C. on the right D. only for galvanic cells E. not at all

3018. Standard electrode potentials are measured with solutions of concentration

A. saturated at 373 K B. any concentration C. 1 mol kg-1 at 273 K D. 1 mol dm-3 at 298 K and 1 atm E. 0.1 mol dm-3 at 273 K

3019. In the electrolytic refining of copper, the impure metal forms the

A. container only B. cathode C. anode D. electrolyte E. salt bridge

3020. Anodizing aluminium produces a protective layer of

A. aluminium chloride B. zinc oxide C. aluminium hydroxide only D. aluminium metal E. aluminium oxide

3021. Cathodic protection of a buried steel pipeline uses a block of

A. lead B. silver C. copper D. magnesium or zinc E. carbon

3022. The unstable arrangement of atoms at the top of the energy barrier is called the

A. reactant pair B. catalyst C. activated complex D. intermediate product only E. product

3023. Powdering a solid reactant increases the reaction rate because it increases the

A. surface area available for reaction B. concentration of the solid C. molar mass D. activation energy E. temperature

3024. On an energy profile diagram, the difference between the energy of the reactants and the peak represents the

A. activation energy of the reverse reaction B. activation energy of the forward reaction C. enthalpy change D. entropy change E. bond energy

3025. A chain reaction consists of the stages

A. hydrolysis and condensation B. initiation, propagation and termination C. dissolution and precipitation D. absorption and emission E. oxidation and reduction

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