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Science Quiz 31

Welcome to your Science Quiz 31

1. 
Consider the following statements: [2003]

  1. Molasses is a by-product of the sugar production process. 
  2. Bagasse obtained in sugar mills is used as a fuel in boilers to generate steam for the sugar factories. 
  3. Sugar can only be produced from sugarcane as the raw material. 

Which of these statements are correct?

2. 
The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is: [2003]

3. 
Assertion (A): In the periodic table of chemical elements, electron affinity is always found to increase from top to bottom in a group. [2003] Reason (R): In a group, the atomic radius generally increases from top to bottom.

4. 
Assertion (A): Unsaturated fats are more reactive compared with saturated fats. [2003] Reason (R): Unsaturated fats have only single bonds in their structure.

5. 
With reference to ionic compounds, consider the following statements: [2003]

  1. Ionic compounds are insoluble in alcohol. 
  2. Ionic compounds in the solid state are good conductors of electricity. 

Which of these statements is/are correct?

6. 
Which one of the following statements is correct? [2003]

7. 
Which one of the following statements is not correct? [2002]

8. 
Match List I (Oxidation number) with List II (The element) and select the correct answer using the codes given below this lists: [2002]

List I (Oxidation number) 

  1. 2 
  2. 3
  3. 4
  4. 6

List II (The element)

  1. Oxidation number of Mn in MnO2
  2. Oxidation number of S in H2S2O7
  3. Oxidation number of Ca in CaO2
  4. Oxidation number of Al in NaAIH4

9. 
Assertion (A): Synthetic detergents can lather well in hard water. [2002] Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.

10. 
Assertion (A): A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece. [2001] Reason (R): The density of copper is more than that of glass.

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