s-Block Elements
Collection of questions on s-block elements.
Questions
Oxidation state of the central atom in A and B are _______ and _______ respectively.
A + H2O → C + H2O2 + O2
B + H2O → C
2B → D + 2K (At 670K)
K is pottasium
- + 1, + 4
- + 4, + 1
- + 1, + 1
- + 4, + 4
- None of these
Which statement(s) is/are false about A?
- It is a peroxide.
- It is paramagnetic in nature.
- On reaction with water, it produces a weak base.
A + H2O → C + H2O2 + O2
B + H2O → C
2B → D + 2K (At 670K)
K is pottasium
- 1, 2, 3
- 1, 2
- 1, 3
- 2, 3
- None of these
X: D + H2O → C + H2O2
Y: D + H2O → C + O2
Reactions X and Y are carried out in __________ and ___________ temperatures respectively.
A + H2O → C + H2O2 + O2
B + H2O → C
2B → D + 2K (At 670K)
K is pottasium
- low, high
- high, low
- room, high
- very low, room
- none of these
The solubility of Na2SO4 ______________ with increase in temperature upto 305K and thereafter _____________.
- increases, decreases
- decreases, increases
- increases, remains constant
- remains constant, decreases
- none of these
What is/are true about C?
- It conducts electricity.
- It is used as Lindlar's catalyst.
- It is used in organic synthesis.
When a metal M is heated in excess of air, it gives two products A and B. A is pale blue in colour. B on reaction with liquid ammonia gives C. B on rection with water produces D. B dispropotionates to A on heating at 670K.
- 1, 2, 3
- 1, 2
- 1, 3
- 2, 3
- None of these
M + N2 → A
A + H2O → NH3
Which metal can M be?
- Be
- Mg
- Ca
- Sc
- None of these
Metal M does not impart any color to flame, and its chloride in solid state is polymeric. The hybridization of M in its chloride in vapor state above 900oC is
- sp
- sp2
- sp3
- sp3d
- none of these
When dry chlorine is passed over a heated mixture of coke and MgO, the product formed is
- MgCO3
- CCl4
- CO
- CO2
- None of these
When a mixture of CaSO4 and C is heated, product formed is
- CaO
- CaS
- CO
- SO3
- SO2
Which of the following will release H2O2 when treated with cold dilute acids?
- KO2
- MgO
- Na2O
- BaO2
- None of these
F is used for which of the following purposes?
- As a deliquescent.
- As a desiccator.
- As an agent to dry NH3.
A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.
- 1, 2, 3
- 1, 2
- 2, 3
- 1, 3
- none of these
When a mixture of G and carbon is heated, it gives __________.
A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.
- B
- C
- D
- F
- None of these
The metal in compound F imparts which color to the flame?
A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.
- Burgundy red
- Brick red
- Apple green
- Crimson red
- None of these
G on heating at high temperature gives _________ .
A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.
- A
- B
- C
- D
- None of these
Solubility of sulphates of alkaline earth metals _______________ down the group due to ____________ of hydration energy down the group.
- increases, decrease
- increases, increase
- decreases, decrease
- decreases, increase
- None of these
A on reaction with ___________ and ____________ H2SO4 produces H2O2 and O2 respectively.
When a metal M is heated in excess of air, it gives two products A and B. A is pale blue in colour. B on reaction with liquid ammonia gives C. B on rection with water produces D. B dispropotionates to A on heating at 670K.
- cold dilute, hot dilute
- cold dilute, cold concentrated
- cold dilute, hot concentrated
- hot dilute, hot concentrated
- none of these
Which statement(s) is/are true?
- M2SO4.10H2O is known as Glauber's salt.
- Carbonate of metal M is used as an antacid.
- Cooling M2SO4.10H2O below 285K results in M2SO4.3H2O.
When a metal M is heated in excess of air, it gives two products A and B. A is pale blue in colour. B on reaction with liquid ammonia gives C. B on rection with water produces D. B dispropotionates to A on heating at 670K.
- 1, 2, 3
- 1, 2
- 1, 3
- 2, 3
- None of these
D on reaction with chlorine gives _____________ .
A white coloured compound A on heating gives a gas C and a solid residue B. C on reaction with RMgX gives carboxyilic acid. B on reaction with water gives D which on reaction with H2O2 gives E through formation of an intermediate compound. E on reaction with dil. HCl gives F and hydrogen peroxide. F is used for removing ice on the roads. F on reaction with sulfuric acid gives G and an acid.
- bleaching powder
- glauber's salt
- hydrolith
- fusion mixture
- none of these