Chemistry Past Questions And Answers
The amount of methane molecules, CH4 in 8.0 grams of methane is
- A) 8 mol
- B) 128 mol
- C) 0.5 mol
- D) 3.01
A motor truck releases an average of 5.0g CO into air for every km covered. How many molecules of CO will be emitted into the air if the truck travels 8 km?[C = 12; O = 16; NA= 6.02 × 1023
- A) 4.32
- B) 2.48
- C) 8.6
- D) 6.82
When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of
- A. calcium only
- B. zinc only
- C. calcium and znic only
- D. sodium and zinc only
Starch can be converted to ethyl alcohol by Options
- A) distillation
- B) fermentation
- C) isomerization
- D) cracking
What is the main type of reaction alkenes undergo?
- A. Addition
- B. Condensation
- C. Elimination
- D. Substitutio
The acid used in electrolysis of water is dilute
- A) HNO3
- B) CH3COOH
- C) H2SO4
- D) HCl
Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have
- A) a single bond
- B) a double bond
- C) a triple bond
- D) an ionic bond
Silver trioxonitrate (V) on heating, gives
- A) Ag, N2O and O2
- B) Ag2O, N2 and O2
- C) Ag2O and N2O
- D) Ag, NO2 ?and O2
The compound of copper which is used in electroplating dyeing, printing, wood preservation and as a fungicide is
- A. copper (ll) hydroxide
- B. copper (ll) trioxonitrate (V) pentahydrate
- C. copper (ll) tetraoxosulphate (VI) pentahydrate
- D. copper (ll) oxide
How many moles of oxygen molecules would be reduced from the decomposition of 2.5 moles of potassium trioxochloratc (V)?
- A) 2.50
- B) 3.50
- C) 3.75
- D) 2.50