A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
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In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F2 is
(c) 1 : 1, is the correct option.
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In the experiment it is found that 2.0769 gram of pure X produce 3. 6769 gram of pure x2o5 the number of mole of X is
The balanced equation for the above reaction is 2 X + 5/2 O2 → X2O5 Now the mass of oxygen using law of conservation of mass = 3.6769 - 2.0769 Hence mass of Oxygen...
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What happens when a pressure greater than the atmospheric pressure is applied to pure water or a solution?
The water potential of pure water or a solution increases on the application of pressure values more than atmospheric pressure. For example: when water diffuses into a plant cell, it...
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Which of the following statements are true for pure substances? (i) Pure substances contain only one kind of particles
(b) (i) and (iii)
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You are given two samples of water labelled as ‘A’ and ‘B’. Sample ‘A’ boils at 100°C and sample ‘B’ boils at 102°C.
Sample ‘B’ will not freeze at 0°C because it is not pure water. At 1 atm, the boiling point of pure water is 100°C and the freezing point of pure...
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Two liquids A and B boil at 145ºC and 190ºC respectively. Which of them has higher vapour pressure at 80ºC ?
Lower the boiling point more volatile is the respective compound. Therefore, liquid A will have higher vapour pressure at 80ºC.
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Discuss the following techniques of Scientific Work Study: (a) Time Study (b) Motion Study (c) Fatigue Study
(a) Time Study– In this technique Taylor emphasised on setting a standard time limit for completing any particular job. With the help of time measuring tools, considerable readings were taken for...
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Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil.
(a) Tiny bubbles appeared due to the evolution of air dissolved in water. (b) No, tiny bubbles will not appear as there is no dissolved air in this water.
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Find the increase in pressure required to decrease the volume of a water sample by 0.01%. Bulk modulus of water = 2.1 x 10^9 N/m^2.
Let the original volume =V when the pressure = 0. At a certain pressure P, the volume is V'. Change in volume = -(V-V'), Bulk strain = -(V-V')/V Bulk modulus = B =2.1x10⁹...
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One day Ayesha’s mother put some water to boil on the stove for making tea. She got busy with something and forget about it.
The water evaporated.
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