Chemistry Past Questions And Answers
Two organic compounds K and L were treated with a few drops of Fehling's solutions respectively . K formed a brick-red precipitate while L, remains unaffected. The compound K is an
- A) alkanol
- B) alkane
- C) alkanal
- D) alkanone
The ration of reactants to products is 1: 3: 2 in the reaction represented by the equation below: N\(_{2(g)}\) +
3H\(_{2(g)}\) \(\rightarrow\) 2NH\(_{3(g)}\). Which of the following laws is demonstrated by this?
- A) Boyle
- B) Law of multiple proportion
- C) Gay Lussac
- D) Law of constant composition
Which experiment led to the measurement of the charge on an electron?
- A. Mass spectrometric experiment
- B. Oil-drop experiment
- C. Scattering α - particles
- D. Discharge-tube experiment
When sodium is added to ethanol, the products are?
- A. sodium hydroxide and water
- B. sodium hydroxide and hydrogen
- C. sodium ethoxide and water
- D. sodium ethoxide and hydrogen
If the value of ΔH is positive for a reaction, it means that the reaction is?
- A. exothermic
- B. endothermic
- C. spontaneous
- D. slow
A gas occupies a volume of 1.5 liters at a pressure of 2 atmospheres. If the pressure is increased to 4 atmospheres while the temperature remains constant, what will be the new volume of the gas?
- A. 6 liters
- B. 1.5 liters
- C. 0.75 liters
- D. 3 liters
The number of electrons in the outermost shell of the atom represents its
- A) period
- B) number of shells
- C) group
- D) atomic number
Cathode rays causes an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays
- A) are positively charged
- B) are negatively charged
- C) have mass
- D) travel in straight lines
Which of the following allotrope of carbon is a constituent of a lead pencil?
- A) Graphite
- B) Diamond
- C) Lampblack
- D) Soot
(a) Define esterification.
(b) State two properties of plastic.
(c) Name the components of duralumin.
(d) What is meant by each of the following terms?
(i) Raw material.
(ii) Primary product.
(e) State Charles' law.
(f) List four pieces of protective equipment in the laboratory.
(g) Give two uses of ammonia.
(h) Name the:
(i) process by which lighter hydrocarbons are obtained from heavier ones;
(ii) products formed from the reaction between ethanol and sodium metal.
(i) Determine the oxidation number of sulphur in H\(_2\)SO\(_4\).
(j) Write the IUPAC name for each of the following compounds: (i) NaClO\(_3\); (ii) CuSO\(_4\)5H\(_2\)O.
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