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Q1) The sulphide ore of copper is concentrated by.. [ AFMC 2000]




SOLUTION


Answer: (b)


Q2) The atomic radius decreases in aperiod due to.. [ AFMC 2001]




SOLUTION

In periode, with increase in atomic number the number of electrons in shell and number of protons in the nucleus increases leading to decrease in size due to increase in effective nuclear charge
Answer: (a)


Q3) CaCO3 ↔ CaO + CO2 reaction in aline goes to completion because: [ AFMC 2005]



SOLUTION

Removal of CO2 shifts the reaction to forward direction for maintaining the equilibrium constant
Answer:(c)



Q4) Identify the correct order of electron affinity for O-, O, F- and Na+ [ AFMC 2010]



SOLUTION

Electron affinity or Electron gain enthalpy depend on i) Nuclear charge more nuclear charge more affinity
ii) Atomic size More size lower affinity
iii) Electron configuration : For Half filed and completely filled valance shell electron affinity is low almost zero
For given ions and element Na+ have a maximum electron affinity because of higher nuclear charge and loest for O
Answer: (a)


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