Class X :
Chemistry (final test)[100]
Attempt all questions
Section A: (40)
Que 1: I)choose the correct option : (16)
1.Common soluble ,white compounds of Alkali and alkaline earth
metal groups can be distinguished in certain analytical way ,Which
one of the following is Not correct for that analysis:
A. Nitration of the compound using NO2 in water solution then
heating to decomposition point .
B.Flame testing the mixture by first ionizing the compounds using
HCl(dil.)
C.Addition of H+ concentrations to Solution
D.Using transition soluble compound(like Iron(III) Acetate)
2.A compound with formula MX where M can be metal ,non metal or
metalloid goes under following series of reactions as:
MX + H2SO4(conc.)→ MSO4 + HX
MX + H2O(conc.)→ M(OH) + HX
MX + H2+∆→MH+ HX
So X may be :
A.Chalcogens
B.Transition metals
C.pnictogens , D.Halogens
, 3.For production of element copper,the debris from a remote mine
where copper is present in traces as an ore or two ,the processes
needed for the extraction are listed as :
1.The debris is Pulverized to have more surface area
2.Using Sodium ethyl xanthate the froth of sulfide ores is separated
3.The big pieces are sifted using a sift or gravity method
4.The oxides of Cu is reduced using wood gas from green wood
poles.
5.Carbonate rocks are heated then reduced to corresponding
metals using Coke
6.Electrolysis is employed to further purify copper
7.Electromagnet is used to separate iron based rocks .
Then the correct order of the extraction is :
A.1→7→3→2→5→4→6
B.2→5→3→4→1→7→6
C.1→2→5→7→3→4→6
D.1→7→3→2→6→5→4
4.Assertion (A):Nital a commonly used metal etchant in industry
comprises of mixture of HNO3 and An alcohol mainly ethanol.
Reason (R): The nitric acid is powerful oxidizer due formation of
nascent oxygen [O] as: HNO3+ light → HNO2 +[O]
A.A and R are true ,R is explanation of A
B.A and R are true ,R is Not explanation of A
Chemistry (final test)[100]
Attempt all questions
Section A: (40)
Que 1: I)choose the correct option : (16)
1.Common soluble ,white compounds of Alkali and alkaline earth
metal groups can be distinguished in certain analytical way ,Which
one of the following is Not correct for that analysis:
A. Nitration of the compound using NO2 in water solution then
heating to decomposition point .
B.Flame testing the mixture by first ionizing the compounds using
HCl(dil.)
C.Addition of H+ concentrations to Solution
D.Using transition soluble compound(like Iron(III) Acetate)
2.A compound with formula MX where M can be metal ,non metal or
metalloid goes under following series of reactions as:
MX + H2SO4(conc.)→ MSO4 + HX
MX + H2O(conc.)→ M(OH) + HX
MX + H2+∆→MH+ HX
So X may be :
A.Chalcogens
B.Transition metals
C.pnictogens , D.Halogens
, 3.For production of element copper,the debris from a remote mine
where copper is present in traces as an ore or two ,the processes
needed for the extraction are listed as :
1.The debris is Pulverized to have more surface area
2.Using Sodium ethyl xanthate the froth of sulfide ores is separated
3.The big pieces are sifted using a sift or gravity method
4.The oxides of Cu is reduced using wood gas from green wood
poles.
5.Carbonate rocks are heated then reduced to corresponding
metals using Coke
6.Electrolysis is employed to further purify copper
7.Electromagnet is used to separate iron based rocks .
Then the correct order of the extraction is :
A.1→7→3→2→5→4→6
B.2→5→3→4→1→7→6
C.1→2→5→7→3→4→6
D.1→7→3→2→6→5→4
4.Assertion (A):Nital a commonly used metal etchant in industry
comprises of mixture of HNO3 and An alcohol mainly ethanol.
Reason (R): The nitric acid is powerful oxidizer due formation of
nascent oxygen [O] as: HNO3+ light → HNO2 +[O]
A.A and R are true ,R is explanation of A
B.A and R are true ,R is Not explanation of A
