Which of the following compounds has maximum volatility?

Which one of the following will show optical isomerism?

The ozone layer forms naturally by

• the interaction of CFC with oxygen

• the interaction of UV radiation with oxygen

• the interaction of IR radiation with oxygen

• the interaction of oxygen and water vapour

The standard reduction potential E° for half-reaction are

Zn → Zn²⁺ + 2e^- ; E° = + 0.76 V

 Fe → Fe²⁺ + 2e^- ; E° = + 0.41 V

The EMF of the cell reaction

Fe²⁺ + Zn → Zn²⁺ + Fe is

• -0.35 V

• +0.35 V

• +1.17 V

• -1.17 V

Which one of the following is not true at room temperature and pressure?

• P₄O₁₀ is white solid

• SO₂ is a colourless gas

• SO₃ is a colourless gas

• NO₂ is a brown gas

An element belongs to group 15 and third period of the Periodic Table. Its electronic configuration wil be

• 1s²2s²2p³

• 1s²2s²2p⁴

• 1s²2s²2p⁶3s²3p³

• 1s²2s²2p⁶3s²3p²

27.

Platinum, palladium and iridium are called noble metals because

• Alfred Nobel discovered them

• they are shining lustrous and pleasing to look at

• they are found in native state

• they are inert towards many common reagents

NO₂ is not obtained on heating

• AgNO₃

• KNO₃

• Cu(NO₃)₂

• Pb(NO3)2

Which of the following represents the composition of camallite mineral?

• K₂O.Al₂O₃.6SiO₂

• KNO₃

• K₂SO₄.MgSO₄.MgCl₂.6H₂O

• KCl.MgCl₂.6H₂O

Anhydrous ferric chloride is prepared by

• dissoving Fe(OH)₃ in concentrated HCl

• dissolving Fe(OH)₃ in dilute HCl

• passing dry HCl over heated iron scrap

• passing dry Cl₂ gas over heated iron scrap