JEE Main Chemistry - Chemistry of Lighter Metals
Exam Duration: 60 Mins Total Questions : 30
which one of the following anhydrous halides can be prepared by heating its hydrated form?
- (a)
Zncl2
- (b)
Mgcl2
- (c)
Bacl2
- (d)
Alcl3
Bleaching powder is obtained by the interaction of chlorine and
- (a)
dil.solution of Cu(OH)2
- (b)
con.solution of Cu(OH)2
- (c)
dry CaO
- (d)
moist slaked lime
Which of following has the lowest ionisation energy?
- (a)
sodium
- (b)
hydrogen
- (c)
potassium
- (d)
lithium
Which one of the following is preferentially formed on reaction of oxygen with potassium?
- (a)
K2O3
- (b)
KO2
- (c)
K2O
- (d)
K2O4
The alkaline earth metals are
- (a)
Na and K
- (b)
Mg and Ca
- (c)
Cu and Mg
- (d)
Al and Fe
Which one of the following elements does not belong to the third row of periodic table?
- (a)
Mg
- (b)
Cu
- (c)
Al
- (d)
P
An aqueous solution of potash alum is
- (a)
alkaline
- (b)
acidic
- (c)
neutral
- (d)
soapy to touch
W hich one of the folowing is the main compound formed on reaction of sodium with limited supply of oxygen?
- (a)
Na2O
- (b)
NaO2
- (c)
Na2O2
- (d)
Na2O4
Which one the following is the major constituent of gun powder?
- (a)
Chile salt petre
- (b)
charcol
- (c)
nitre
- (d)
sulphur
In the manufacture of sodium hydroxide,which one is obtained as a by-product?
- (a)
oxygen
- (b)
chlorine
- (c)
sodium carbonate
- (d)
sodium chloride
Sodium thiosulphate is used in photography to
- (a)
develop the film
- (b)
dissolve silver
- (c)
dissolve silver halide
- (d)
harden the film
A sloid of compound of group IA (Group according to IUPAC ) element and it gives violet colour in flame test; the solid A is
- (a)
NaCl
- (b)
KCl
- (c)
CsCl
- (d)
LiCl
The reaction of sodium thiosulphate with I2 gives
- (a)
sodium sulphate
- (b)
sodium thiosulphide
- (c)
sodium sulphite
- (d)
sodium tetrathionate
Sodium is highly reactive and therefore kept under
- (a)
liquid nitrogen
- (b)
kerosene
- (c)
olive oil
- (d)
chloroform
KClO3 is not used
- (a)
as a powerful oxident
- (b)
in fire works
- (c)
in the manufacture of detergents
- (d)
in the manufacture of matches
Identify the correct statement:
- (a)
Gypsum is obtained by heating Plaster of Paris
- (b)
Plaster of Paris can be obtained by hydration of gypsum
- (c)
Plaster of Paris contains higher pecentage of calcium than does gypsum
- (d)
Plaster of Paris is obtained from gypsum by oxidation
Setting of Plaster of Paris is
- (a)
oxidation with atmospheric oxygen
- (b)
combination with atmospheric CO2
- (c)
dehydration
- (d)
Hydration to yield another hydrate
The metal which can be obtained from all the three ores,dolomite,magnesite and carnellite, is
- (a)
sodium
- (b)
potassium
- (c)
magnesium
- (d)
calcium
Themite for welding is made by mixing
- (a)
Al and Fe2O3
- (b)
Al2O3 and Fe2O3
- (c)
MgO and Al2O3
- (d)
Al and MgO
Action of caustic soda on aluminium gives a compound having formula
- (a)
Al2(OH)4
- (b)
NaAlO2
- (c)
Na2Al(OH)4
- (d)
Na3AlO3
When the same amount of pure aluminium is treated seperatedly with excess of dilute suphuric acid and excess of sodium hydroxide solutions, the ratio of the volumes of hydrogen evolved is
- (a)
1:1
- (b)
1:2
- (c)
2:1
- (d)
1:3
The most important ore of aluminium is
- (a)
Alumina
- (b)
Bauxite
- (c)
Cryolite
- (d)
Fluorspar
Which one of the following statement is wrong about aluminium
- (a)
It is the most abundant metal in the earth crust
- (b)
It dissolves readily in concentrated nitric acid
- (c)
It is affected by caustic soda solution
- (d)
It is a good reducing agent
Which on e of the following represents potash alum?
- (a)
KAl(SO4)2.12H2O
- (b)
KAl(SO4)2.24H2O
- (c)
KCr(SO4)2.24H2O
- (d)
KMn(SO4)2.24H2O
The blue colored mineral, Lapis Lazuli which is used as a semi-precious stone is a mineral of the following class:
- (a)
Sodium aluminosilicate
- (b)
Basic copper carbonate
- (c)
Zinc carbonate
- (d)
prussian blue
Amongst the following compounds, the weakest base is
- (a)
NaOH
- (b)
KOH
- (c)
Mg(OH)2
- (d)
Ca(OH)2
Which of the products is formed when SiCl4 vapour is passed over hot Mg?
- (a)
MgSiCl6
- (b)
Mg2Si+Cl2
- (c)
Si+MgCl2
- (d)
SiCl2+MgCl2
All of the following substances react with watyer. Tha pair that yields the same gaseous product is
- (a)
NaNa2O2
- (b)
K and KO2
- (c)
Ba and BaO2
- (d)
Ca and CaH2
Aluminium is more reactive than iron but Aluminium is lesseasily corroded than iron because
- (a)
aluminium is noble metal
- (b)
oxygen forms a protective oxide layer
- (c)
iorn under goes reaction easily with water
- (d)
iron forms both mono and divalent ions
In red blood cells of human beings,the ratio of potassium to sodium is
- (a)
6:2
- (b)
7:1
- (c)
8:1
- (d)
10:1