Questions
Question 1 Multiple Choice (Single Answer)
What does the delta sign used over an arrow in a chemical equation signify?
- Reaction is very slow.
- Reaction is very fast.
- Reaction is endothermic.
- Reaction is exothermic.
Question 2 Multiple Choice (Single Answer)
What of the following is true about rusting of iron?
- It is temporary.
- It is reversible.
- New substances are formed.
- Composition remains unchanged.
Question 3 Multiple Choice (Single Answer)
Corrosion is a chemical reaction that involves
- inside of the object changing from an element to a compound
- surface of the object changing from an element to a compound
- nothing happens
- surface of the object changes from one element into another element
Question 4 Multiple Choice (Single Answer)
The metal which gets coated by a layer of sulphide when exposed to air is
- silver
- iron
- zinc
- gold
Question 5 Multiple Choice (Single Answer)
Rusting is a special term, given to the corrosion of which metal?
- Zinc
- Copper
- Nickel
- Iron
Question 6 Multiple Choice (Single Answer)
What is rancidification?
- Chemical decomposition of fats and other lipids
- Oxidation of carbohydrates
- Rusting of metals
- None of the above
Question 7 Multiple Choice (Single Answer)
Which of the following consist(s) a single covalent bond?
- H2
- O2
- N2
- All of the above
Question 8 Multiple Choice (Single Answer)
Which of the following is not an ionic compound?
- NaCl
- CH4
- KCl
- MgO
Question 9 Multiple Choice (Single Answer)
The number of electron pairs shared in a triple covalent bond is
- 6
- 3
- 2
- none of the above
Question 10 Multiple Choice (Single Answer)
Which of the following compounds/molecules contains triple covalent bond?
- Ammonia
- Water
- Nitrogen
- Hydrogen