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⁞ Chemistry

General Science ➤ Chemistry ➤ 2
Question 46
Q46.  Consider the following pairs of compounds with their chemical names:

  1. Blue vitriol – copper sulphate
  2. White vitriol – zinc sulphate
  3. Green vitriol – iron(II) sulphate
Which of the above is/are correct?
 

Answer :  1, 2 & 3


All given pairs are correctly matched

  1. Blue vitriol – copper sulphate
  2. White vitriol – zinc sulphate
  3. Green vitriol – iron(II) sulphate

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Question 47
Q47.  For most liquids, viscosity increases with increasing:

1. Pressure
2. Temperature
3. Surface tension

Select the correct option from codes given below:
 

Answer :  1 & 3 Only


In liquids main cause of viscosity is cohesion between the molecules. As the temperature of a liquid increases, its surface tension decreases.The viscosity of liquids reduce with increase in temperature.
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Question 48
Q48.  Which of the following chemicals is called Philosopher’s Wool?
 

Answer :  Zinc oxide


The compound zinc oxide (ZnO) is called philosopher's wool. ZnO is a white powder that is insoluble in water. Zinc oxide is used as an additive in sun screens, sun lotions, in rubber manufacturing and in photocopying products. Alchemists, as part of their rituals, burn zinc in air and collect the residue, which formed into white woolly tufts. They called it Lana philosophica in Latin, meaning philosopher's wool.
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Question 49
Q49.  What is the unit of Stress?
 

Answer :  N/m


Stress is defined as the total force applied per unit area. In units, stress is exactly the same as pressure (Newtons per meter). Or mathematically: σ = force area. where σ is the stress.
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Question 50
Q50.  Which of the following is NOT correct about Xenon Hexafluoride?
 

Answer :  At room temperature, it is a colourless liquid


Xenon Hexafluoride is a noble gas compound which is a colourless solid at room temperature. Its chemical formula is XeF6.
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