What is the order of distance for Vander Wall forces to be active?
[A] 10^–6 metre
[B] 10^–7 metre
[C] 10^–8 metre
[D] 10^–9 metre

Which of the following element has the highest first ionization enthalpy?
[A] Magnesium
[B] Strontium
[C] Beryllium
[D] Barium

What is the electron configuration of Radium?
[A] 6s²
[B] 7s²
[C] 7s² 7p⁶
[D] 7s² 7p⁴

What is the general outer electron configuration of Group 13 elements?
[A] ns² np²
[B] ns²
[C] ns² np¹
[D] ns² np³

Which of the following methods is most suitable for ore concentration if the ore is soluble in some suitable solvent?
[A] Hydraulic Washing
[B] Magnetic Separation
[C] Froath floatation
[D] Leaching

Which of the following refining methods works on the principle that impurities are more soluble in the melt than in the solid state of the metal?
[A] Liquation
[B] Electrolytic refining
[C] Zone refining
[D] Vapour Phase refining

What is the total number of allowed orbitals in a shell, if principal quantum number is n?
[A] n
[B] 2n
[C] n²
[D] n³

What can be the maximum number of electrons in a shell, if principal quantum number is n?
[A] n
[B] n²
[C] 2n²
[D] 3n³

Which of the following quantum number determines the number of sub-shells?
[A] Electron spin quantum number
[B] Principal quantum number
[C] Magnetic quantum number
[D] Azimuthal quantum number

What do we call an ideal body which emits and absorbs all frequencies?
[A] Black body
[B] White body
[C] Red body
[D] Zero body

Which of these species are isoelectronic?
[A] Al⁺ , B^–
[B] Mg⁺ , Cu^–
[C] Na⁺ , Al^–
[D] Na⁺ , F^–