Chemical Reactivity (Group 1)
Trending Questions
- KO2>RbO2>CsO2
- RbO2>CsO2>KO2
- CsO2>RbO2>KO2
- KO2>CsO2>RbO2
A compound which can be used in space vehicles both to absorb and liberate is?
Describe smelting of iron in a blast furnace.
Write all the reactions which take place in different zones of the blast furnace.
A mixture of oxygen and acetylene is used to produce a very high temperature flame called __________ .
- Mg(NO3)2
- LiNO3
- NaNO3
- Ca(NO3)2
- KO2>RbO2>CsO2
- RbO2>CsO2>KO2
- CsO2>RbO2>KO2
- KO2>CsO2>RbO2
- ABCLiN3LiOHNH3
- ABCLi3NLiOHNH3
- ABCLiN3LiHNO2
- ABCLi3NLiOHNO2
- LiCl, MgCl2
- RbCl, BeCl2
- RbCl, MgCl2
- MgCl2, BeCl2
- They are deep blue coloured solutions
- They are highly conductive in nature
- They are diamagnetic in nature
- Ammoniated cation and solvated electrons are formed in the solution
Assertion (A): Sodium metal is stored in kerosene
Reason (R): The density of sodium is less than water
A and R are true & R is the correct explanation of A
A and R are true but the R is not the correct explanation of A
A is true, R is false
A is false, R is true
- Metal amide
Fe.(NH4)x
- H2
- Iron hydride
- Li⨁>Na⨁>K⨁>Rb⨁
- Rb⨁>Na⨁=K⨁>Li⨁
- Li⨁<Na⨁<K⨁<Rb⨁
- Na⨁=K⨁>Rb⨁>Li⨁
Among alkali metals, which gives a yellow colour during flame test?
K
Li
Cs
Na
- Mg(NO3)2
- LiNO3
- NaNO3
- Ca(NO3)2
(1) Basic strength of oxides:
Cs2O<Rb2O<K2O<Na2O<Li2O
(2) Stability of carbonates:
Na2CO3<K2CO3<Rb2CO3<Cs2CO3
(3) Stability of bicarbonates:
LiHCO3<NaHCO3<KHCO3<RbHCO3<CsHCO3
(4) Melting point:
NaF<NaCl<NaBr<NaI
- 1 and 4
- 1 and 3
- 1 and 2
- 2 and 3
- True
- False
- Li
- Rb
- K
- Cs
- It shows blue colour
- It exhibits electrical conductivity
- Reaction to produce sodium amide can happen photochemically
- It produces hydrogen gas on leaving it undisturbed for some time
Assertion (A): Sodium metal is stored in kerosene
Reason (R): The density of sodium is less than water
A and R are true & R is the correct explanation of A
A and R are true but the R is not the correct explanation of A
A is true, R is false
A is false, R is true
- Na
- Cs
- Li
- K
- Li
- Rb
- K
- Cs
Among KO2, Na2O and BaO2 unpaired electron(s) is/are present in:
Na2O and BaO2
KO2 and BaO2
KO2 only
BaO2 only
(IIT-JEE, 1987)
- H2, O2
- O2, H2
- O2, Na
- O2, SO3
The reaction of sodium is highly exothermic with H2O. The rate of reaction is lowered by
Lowering the temperature
Mixing with alcohol
Mixing with acetic acid
Making an amalgam
(1) Basic strength of oxides:
Cs2O<Rb2O<K2O<Na2O<Li2O
(2) Stability of carbonates:
Na2CO3<K2CO3<Rb2CO3<Cs2CO3
(3) Stability of bicarbonates:
LiHCO3<NaHCO3<KHCO3<RbHCO3<CsHCO3
(4) Melting point:
NaF<NaCl<NaBr<NaI
- 1 and 4
- 1 and 3
- 1 and 2
- 2 and 3
- Blue colouration happens due to ammoniated electrons
- Blue colour changes to bronze, on dilution due to the formation of metal clusters
- Increasing the concentration of the alkali metal makes the solution less paramagnetic due to electron-electron pairing
- On heating, blue colour disappears due to formation of a metal amide and H2 gas
- CH3ONa+CH3COOH→CH3OH+CH3COONa
- PhONa+NH3→PhOH+NaNH2
- HC≡CH+NaNH2→HC≡CNa+NH3
- HCOOH+PhONa→HCOONa+PhOH
(1) Basic strength of oxides:
Cs2O<Rb2O<K2O<Na2O<Li2O
(2) Stability of carbonates:
Na2CO3<K2CO3<Rb2CO3<Cs2CO3
(3) Stability of bicarbonates:
LiHCO3<NaHCO3<KHCO3<RbHCO3<CsHCO3
(4) Melting point:
NaF<NaCl<NaBr<NaI
- 1 and 4
- 1 and 3
- 1 and 2
- 2 and 3