Chemistry

NH3(g) + HCl(s) → NH4Cl(s). The entropy change in the system is?

A. positive B. zero C. negative D. indeterminate Correct Answer: Option C - negative

5 years ago

What is the IUPAC nomenclature of the compound NaCIO??

A. sodium oxochlorate (I) B. sodium chloro (I) oxide C. sodium monooxochlorate (II) D. sodium chloro (I) monoxide Correct Answer:…

5 years ago

The oxidation state of carbon in HCOOH is?

A. -1 B. +2 C. +3 D. zero Correct Answer: Option B = +2

5 years ago

Insoluble salts can be prepared by?

A. titrating an alkali against an appropriate acid B. reacting an acid with trioxocarbonatr (IV) salt C. directing combination of…

5 years ago

0.05 mol dm-³ HCl is neutralized by 25 cm³ NaOH. If the volume of acid used is 32.00cm³. What is the concentration of the base?

A. 0.016 mol dm-³ B. 0.032 mol dm-³ C. 0.039 mol dm-³ D. 0.064 mol dm-³ Correct Answer: Option D…

5 years ago

What is the pH of 0.001 mol dm-³ solution of sodium hydroxide?

A. 14 B. 13 C. 12 D. 11 Correct Answer: Option D - 11

5 years ago

The vulcanizer’s solution is prepared by dissolving rubber in?

A. ethanol B. kerosine C. benzene D. petrol Correct Answer: Option C - benzene

5 years ago

When a few drops of water is added to a blue anhydrous cobalt (II) chloride; the colour changes to?

A. white B. pink C. red D. blue Correct Answer: Option B - pink

5 years ago