Uni10 s-block elementdt

The alkali metal which has the highest reducing power is …

• Lithium

• Sodium

• Potassium

• Rubedium

The raw materials for the manufacture of cement are---------.

• Clay & gypsum

• Limestone & clay.

• Limestone & plaster of paris

• Plaster of paris & clay

Give the chemical name of baking soda.

• Sodium carbonate

• Sodium hydrogencarbonate

• Sodium Hydroxide

• Calcium sulphate hemihydrate

Identify the property of plaster of Paris which helps in plastering of broken bones.

• Setting of plaster of Paris to a soft mass

• Setting of plaster of Paris to a hard mass

• Decrease in Setting time of plaster of Paris

• Increase in Setting time of plaster of Paris

When CO2 is passed through lime water it first turns milky & then on passing excess CO2 becomes clear solution due to formation of -------& -----------.

• Calcium carbonate & Calcium bicarbonate

• Calcium hydroxide & Calcium bicarbonate

• Calcium oxide & Calcium carbonate

• Calcium bicarbonate & Calcium carbonate

The valence electrons in Be and Mg are very strongly bound to the nucleus. So they ---------

• Do not get excited & impart colour to the flame

• Do not get excited & do not impart colour to the flame

• Get excited & impart colour to the flame

• All the above

The metal present in the chlorophyll of plants is …………

• Be

• Mg

• Li

• Na

Name the process used for the industrial preparation of sodium carbonate

• A) Haber process

• B)Solvay Process or Ammonia Soda process

• C) Contact provess

• None of the above

What is dead burnt plaster?

• CaSO4. ½ H2O)

• CaSO4.2H2O

• Anhydrous CaSO4

• None

a) Blue coloured solutions are obtained when alkali metals are dissolved in liquid ammonia.

b) ' Li’ and 'Mg' show similar properties.

c) Aqueous solution of Na2CO3 is alkaline.

• All true

• C) false

• All false

• C) true