Which of the following carbonates decomposes at lowest temperature?

• MgCO₃

• CaCO₃

• BaCO₃

• SrCO₃

A white-coloured inorganic compound, on heating, gives a gas which turns lime water milky and residue is left which is yellow when hot and turns white on cooling. The compound is

• Pb(NO₃)₂

• PbCO₃

• BaCO₃

• ZnCO₃

Prussian blue is formed when

• ferrous sulphate reacts with FeCl₃

• ferric sulphate reacts with K₄[Fe(CN)₆]

• ferrous ammonium sulphate reacts with FeCl₃

• ammonium sulphate reacts with FeCl₃

94.

Benedict solution provides

• Ag⁺

• Li⁺

• Cu²⁺

• Ba²⁺

The colour of the flame of sodium is

• deep red

• blue

• green

• golden yellow

Lithium is the strongest reducing agent because of

• its greater hydration energy

• its high ionization energy

• its high electron affinity

• its low electronegativity

The first ionisation potential (in eV) of N and O atoms are

• 14.6, 13.6

• 13.6, 14.6

• 13.6, 13.6

• 14.6, 14.6

"ELEKTRON" is an alloy of

• Cu, Zn and Mg

• Fe and Mg

• Ni and Zn

• Al and Zn

Correct order for solubility of alkaline earth metals in water is 

• MgF₂ > CaF₂ > SrF₂ > BaF₂

• MgF₂ <CaF₂ <SrF₂ <BaF₂

• MgF₂ > CaF₂ < SrF₂ < BaF₂

• BaF₂ >MgF₂ >SrF₂ >CaF₂ 

The second ionisation enthalpies of Li, Be, B and C are in order

• Li > B > C > Be

• Li > C > B > Be

• Be > C > B > Li

• B > C > Be > Li