29Ans 1 C
catalyst do not have any Effect On ∂G it just increases or decreases the Activation Energy..
1. Statement-I : Positive catalysis increases the rate of reactions.
Statement-II : Catalyst decreases the value of ΔGº.
2. Statement-I : Conc. HNO3 makes passive.
Statement-II : Iron racets with HNO3 to form feric nitrate
3. Statement-I : All metals cannot be obtained by carbon reduction.
Statement-II : Carbon is very strong reducing agent but carbon in comparison to oxygen has more affinity towards metals.
4. Statement-I : Inert gases are chemically inert.
Statement-II : I.E. of Inert gases is high and Elactron affinity is zero
5. Statement-I : Pentan-2-one can be distinguished from pentan-3-one, by iodoform test
Statement-II : Pentan-2-one is a methyl ketone while pentan-3-one is not.
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1i think 4 " s option is c
electron gain enthalpy of noble gases hv large +tive values & affinity is close to zero not exactly zero
1An equivalent definition is the energy released (Einitial − Efinal) when an electron is attached to a neutral atom or molecule.
The electron affinities of the noble gases have not been conclusively measured, so they may or may not have slightly negative EAs. Atoms whose anions are more stable than neutral atoms have a greater Eea.. Eea of noble gases are close to 0.
13Chalo, my answers-
1)-C
2)-Wht does this mean-"Conc. HNO3 makes passive" ?
4)-C
5)-A
1avik , Q.2 ) Statement-I : Conc. HNO3 makes iron passive.
so, my answers :
Q.1) C (reason given by govind)
Q.2) C (Here , Fe is rendered passive due to thick protective covering of Fe3O4 )
Q.3) C ( as C has more tendency to form covalent compounds rather O has tendency to form both ionic and covalent compounds )
Q.4) C (EA of noble gases CN BE APPROXIMATELY 0 ,but its not conclusive.)
Q.5) A ( its straightforward correct )