10th-Chemistry-Analytical Chemistry

Salts of normal elements [1 (IA) to 17 (VIIA)] are generally ……………

• Colourless

• Green

• White

• Blue

An example of weak alkali solution is ……………….

• Sodium hydroxide

• Nitrogen dioxide

• Ammonium hydroxide

• Potassium hydroxide

 

Both ammonium and sodium hydroxide are used in analytical chemistry for identifying ……………….. of salts.

• Cations

• Anions

• Electrons

• Both (a) and (b)

Calcium salts with sodium hydroxide give ……………… precipitates.

• Pink

• Blue

• White

• Green

Sodium zincate and water is obtained on reaction of ………………. With concentrated caustic soda.

• Lead

• Sodium

• Zink

• Zink hydroxide

Oxides and hydroxides of certain metals such as …………….., ……………………, …………………. are amphoteric in nature.

• Zink, sodium, aluminium

• Zink, lead, copper

• Aluminium, copper, sodium

• Zink, lead, aluminum

Which white precipitate is soluble in excess NH₄OH ………………………….

• NaCl

• AgCl

• Mg(OH)₂

• NaOH

The hydroxide which is soluble in excess of NaoH is …………………..

• Al(OH)₃

• Fe(OH)₃

• Fe(OH)₂

• Zn(OH)₂

Salts of which elements are generally coloured :

• Transition

• Normal

• Lanthanides

• Inner-transition

Which one of the following salt solutions on reaction with excess sodium hydroxide solution gives a clear solution finally?

• Pb(NO₃)₂(aq)

• CuSO₄(aq)

• FeCl₃(aq)

• ZnSO₄(aq)