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Chemistry Quiz Questions

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Questions and Answers

What is the purpose of adding ammonium chloride before adding ammonium hydroxide in the precipitation of the iron group (III) in qualitative analysis?

To decrease the concentration of –OH ions (correct)

To prevent interference by phosphate ions

To increase the concentration of Cl– ions

To increase the concentration of NH4+ ions

What is the correct sequence of ligands in the order of decreasing field strength?

CO > H2O > S2− > F−

CO > H2O > F− > S2− (correct)

OH > F− > CO > S2−

CO > F− > H2O > S2−

What is the correct decreasing order of basic strength of the conjugate bases CH2Br, NaOH, RO, CH3COO, and Cl?

RO > OH > CH3COO > Cl

OH > RO > CH3COO > Cl (correct)

RO > CH3COO > OH > Cl

Cl > OH > RO > CH3COO

What is the pressure of H2 (in bar) required to make the emf of a hydrogen electrode zero in pure water at 25°C?

10−14 Signup and view all the answers

What is the correct order of ligands in the order of decreasing field strength?

NCS− > EDTA4− > CN− > CO Signup and view all the answers

What is the role of ammonium hydroxide in qualitative analysis?

To precipitate the iron group (III) Signup and view all the answers

What is the effect of adding HBr to the ether?

It undergoes a substitution reaction Signup and view all the answers

What is the relationship between A and C in the given reaction?

A is a reactant and C is a product Signup and view all the answers

What is the identity of B and C in the given reaction?

B is HBr and C is CH2OH Signup and view all the answers

What is the type of mechanism step involved in the given reaction?

Electrophilic substitution Signup and view all the answers