s-Block

Question 1

Half life of Francium?

Answer 1

21 mins

Question 2

Color of flames mnemonics?

Answer 2

Can You Veto Red Bull

Question 3

Which has the least E naught value among alkali elements

Answer 3

Na

Question 4

Li reacts less vigorously with water because?

Answer 4

Small and hydration enthalpy

Question 5

MOH reacts with proton donors like?

Answer 5

Alcohols, gaseous ammonia, alkynes

Question 6

The order is Li > Na > I – > Ag > Cl–

Answer 6

k

Question 7

White metal is an alloy of

Answer 7

Lithium + lead

Question 8

Coolant for fast breeder nuclear reactions?

Answer 8

Liquid Na

Question 9

Hydroxide used for soft soap

Answer 9

KOH

Question 10

∆f H values for fluorides

become ___________ as we go down the group

Answer 10

less negative

Question 11

The melting and boiling points for alkali halides always

follow the trend

Answer 11

F>Cl>Br>I

Question 12

As the _________________ increases down the group, the stability of the carbonates and hydorgencarbonates increases.

Answer 12

electropositive character

Question 13

Name the cathode and anode in Castner Kellner cell

Answer 13

Cathode is mercury, anode is carbon

Question 14

Na-K pump consumes?

Answer 14

More than 1/3rd of the ATP for resting human

Question 15

Mnemonics for color of flame alkaline

Answer 15

Ca, Sr, Ba–> Basic Characteristic And all

Question 16

Springs are made of what allows?

Answer 16

Cu-Be

Question 17

Dehydration of Be and Mg halides cause?

Answer 17

Hydrolysis

Question 18

The aqueous solution of Ca(OH)2 is known as ___________ and a
suspension of slaked lime in water is known
as ___________

Answer 18

lime water, milk of lime

Question 19

What is dead burnt plaster?

Answer 19

CaSO4, 393K

Question 20

Why does the solubility of alkaline earth
metal hydroxides in water increase down
the group?

Answer 20

Since lattice enthalpy decreases much
more than the hydration enthalpy with
increasing ionic size, the solubility
increases as we go down the group

Question 21

Why does the solubility of alkaline earth
metal carbonates and sulphates in water
decrease down the group?

Answer 21

The size of anions being much larger
compared to cations, the lattice enthalpy
will remain almost constant within a
particular group. Since the hydration
enthalpies decrease down the group,
solubility will decrease as found for
alkaline earth metal carbonates and
sulphates

Question 22

Na in body?

K in body?

Answer 22

Naintyg

170g

Question 23

A typical 70 kg man contains about 90 g of Na
and 170 g of K compared with only __ g of iron
and _ g of copper.

Answer 23

Feive

0.06

Question 24

An adult body contains about __ g of Mg and

__ g of Ca

Answer 24

25

1200