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The synthesis of 3 – octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are
A) BrCH2CH2CH2CH2CH3 and CH3CH2C ≡ CH
B) BrCH2CH2CH3 and CH3CH2CH2C ≡ CH
C) BrCH2CH2CH2CH2CH3 and CH3C ≡ CH
D) BrCH2CH2CH2CH3 and CH3CH2C ≡ CH

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is
A) Br2 (g)
B) Cl2 (g)
C) H2O (g)
D) CH4 (g)

The ionization isomer of [Cr(H2O)4Cl(NO2)]Cl is
A) [Cr(H2O)4(O2N)]Cl2
B) [Cr(H2O)4Cl2](NO2)
C) [Cr(H2O)4Cl(ONO)]Cl
D) [Cr(H2O)4Cl2(NO2)]H2O

Aqueous solutions of HNO3, KOH, CH3COOH, and CH3COONa of identical concentrations are provided.
The pair (s) of solutions which form a buffer upon mixing is(are)
A) HNO3 and CH3COOH
B) KOH and CH3COONa
C) HNO3 and CH3COONa
D) CH3COOH and CH3COONa

The reagent(s) used for softening the temporary hardness of water is(are)
A) Ca3(PO4)2
B) Ca(OH)2
C) Na2CO3
D) NaOCl

Among the following, the intensive property is (properties are)
A) molar conductivity
B) electromotive force
C) resistance
D) heat capacity

If the 0.05 molar solution of M+ is replaced by 0.0025 molar M+ solution, then the magnitude of the cell
potential would be
A) 35 mV
B) 70 mV
C) 140 mV
D) 700 mV

Partial roasting of chalcopyrite produces
A) Cu2S and FeO
B) Cu2O and FeO
C) CuS and Fe2O3
D) Cu2O and Fe2O3

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