The catalyst and promoter respectively used in the Haber's process of industrial synthesis of ammonia are
Mo,V2O5
V2O5, Fe
Fe, Mo
Mo, Fe
C.
Fe, Mo
In the Haber's process for the synthesis of ammonia from N2 and H2, Fe is used as catalyst and Mo works as activator.
Bond energy of Cl2, Br2 and I2 follow the order
Cl2 >Br2 > I2
Br2 >Cl2 > I2
I2 > Br2 >Cl2
I2 > Cl2 >Br2
Assertion (A): The boiling points of noble gases increases from He to Xe.
Reason (R): The interatomic van der Waals' attractive forces increases from He to Xe.
The correct answer is:
Both (A) and (R) are true, and (R) is the correct explanation of (A).
Both (A) and (R) are true, and (R) is not the correct explanation of (A).
(A) is true but (R) is not true.
(A) is not true but (R) is true.
The product(s) formed when H2O2 reacts with disodium hydrogen phosphate is
P2O5.Na3PO4
Na2HPO4.H2O2
NaH2PO4, H2O
Na2HPO4.H2O
Which one of the following is used in the preparation of cellulose nitrate ?
KNO3
HNO3
KNO2
HNO2
The oxoacid of sulphur which contains two sulphur atoms in different oxidation states is
pyrosulphurous acid
hyposulphurous acid
pyrosulphuric acid
persulphuric acid
Assertion (A) : Noble gases have very low boiling points.
Reason (R) : All noble gases have general electronic configuration of ns2 np6 (except He).
Both (A) and (R) are true and (R) is the correct explanation of (A).
(A) is false but (R) is true.
(A) is true but (R) is false.
Both (A) and (R) are true and (R) is not the correct explanation of (A).
The charring of sugar takes place when treated with concentrated H2SO4. What is the type of reaction involved in it?
Dehydration reaction
Hydrolysis reaction
Addition reaction
Disproportionation reaction
The increasing order of the atomic radius of Si, S, Na, Mg, Al is
S < Si< Al< Mg< Na
Na< Mg < Si< Al< S
Na< Mg< Si< Al < S
Na< Mg< Al< Si< S