Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

(a)

ethanoic acid

(b)

ethanol

(c)

phenol

(d)

none of these

In which process, fused sodium hydroxide is electrolysed for extraction of sodium ?

(a)

Castner's process

(b)

Cyanide process

(c)

Down process

(d)

All of these

Assertion : Generally alkali and alkaline earth metals form superoxides
Reason : There is a single bond between O and 0 in superoxides
a) both assertion and reason are true and reason is the correct explanation of assertion
b) both assertion and reason are true but reason is not the correct explanation of assertion
c) assertion is true but reason is false
d) both assertion and reason are false

(a)

both assertion and reason are true and reason the correct explanation of assertion

(b)

both assertion and reason are true but reason is not the correct explanation of assertion

(c)

assertion is true but reason is false

(d)

both assertion and reason are false

Which is the correct sequence of solubility of  carbonates of alkaline earth metals ?

(a)

BaCO₃ > SrCO₃ > CaCO₃ > MgCO₃

(b)

MgCO₃ > CaCO₃ > SrCO₃ > BaCO₃

(c)

CaCO₃ > BaCO₃ > SrCO₃ > BaCO₃

(d)

BaCO₃ > CaCO₃ > SrCO₃ > MaCO₃

The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO₂ is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X.(B) is ____________

(a)

CaCO₃

(b)

Ca(OH)₂

(c)

Na₂CO₃

(d)

NaHCO₃

Electronic configuration of 1s block of elements is ______

(a)

ns²

(b)

ns¹

(c)

ns²np¹

(d)

ns²np²

The hydration enthalpies of alkali metal ions decreases in ______ order.

(a)

Li⁺ > Na⁺ > K⁺ > Rb⁺ > Cs⁺

(b)

Cs⁺ > Rb⁺ > K⁺ > Na⁺ > Li⁺

(c)

Li⁺ > Rb⁺ > K⁺ > Na⁺ > Cs⁺

(d)

Rb⁺ > Cs⁺ > K⁺ > Na⁺ > Li⁺

The reducing power of a metal depends on various factors. Suggest the factor. which makes Li, the strongest reducing agent in aqueous solution __________

(a)

Sublimation enthalpy

(b)

Ionisation enthalpy

(c)

Hydration enthalpy

(d)

Electron-gain enthalpy

Which of the following is used in photoelectric cells?

(a)

Na

(b)

K

(c)

Li

(d)

Cs

________ is responsible for the transmission of nerve signals.

(a)

Lithium

(b)

Sodium

(c)

Potassium

(d)

Magnesium

Which of the following metals is most commonly used in photochemical cells?

(a)

Lithium

(b)

Calcium

(c)

Caesium

(d)

Francium

Why Cs and K are used as electrodes in photoelectric cells ___________

(a)

Due to their less ionisation energy

(b)

Due to high ionisation energy

(c)

Due to diagonal relationship

(d)

None of these

Which among the following alkali metals exhibit the most metallic character?

(a)

Na

(b)

Li

(c)

Cs

(d)

K

________ occurs in large amounts in sea water

(a)

NaCI

(b)

KCI

(c)

both a and b

(d)

neither a nor b

Identify the most stable hydride among the following ____________

(a)

NaH

(b)

LiH

(c)

KH

(d)

CsH

Which of the following halides has the highest melting point?

(a)

NaF

(b)

NaCI

(c)

NaBr

(d)

NaI

Electronic configuration of 2s block of elements is _______________

(a)

ns²

(b)

ns¹

(c)

ns²np¹

(d)

ns²np²

Several blocks of magnesium are fixed to the bottom of a ship to ___________

(a)

Keep away the sharks

(b)

prevent of rusting of iron ships

(c)

make the ship lighter

(d)

prevent puncturing by under sea rocks

Which of the following dissolves in water with a hissing sound?

(a)

bleaching powder

(b)

marble

(c)

quick lime

(d)

slaked lime

Sodium react with water more vigorously than lithium because ___________

(a)

it has higher atomic mass

(b)

it is more electropositive

(c)

it is more electronegative

(d)

it is a metal.