All questions
- CO2 has Tc = 38.98 °C and Pc = 73 atm. How many phases of CO2 coexist at i. 50 °C and 73 atm ii. 20 °C and 50 atm. i. 50 °C and 73 atm represent a condition for CO₂ above its T_c. Therefore, under this condition CO₂ exists only as single phase. ii. 20° C... 1
- In which of the following cases, water will have the highest and the lowest boiling point? Higher the pressure to which a liquid is exposed, higher will be its boiling point. The pressure to which water is exposed is maximum in the... 1
- Define: Liquid state Liquid state is the intermediate state between solid state and gaseous state. 2
- Give reason: Liquid possesses properties such as fluidity, definite volume and ability to take shape of the bottom Molecules of liquid are held together by moderately strong intermolecular forces and can move about within the boundary of the liquid. As a... 1
- Name some measurable properties of liquid. Density Boiling point Freezing point Vapour pressure Surface tension Viscosity. 1
- What are the factors affecting vapour pressure? Factors affecting vapour pressure: Nature of liquid: Liquids having relatively weak intermolecular forces possess high vapour pressure. Such... 1
- Explain how temperature affects surface tension. Surface tension is a temperature dependent property. When attractive forces are large, surface tension is large. Surface tension decreases a... 1
- Mention some applications of surface tension. Applications of surface tension: Cleaning action of soap and detergent is due to the lowering of interfacial tension between water and oily... 1
- Give reason: Liquid droplets acquire spherical shape. For a given volume of a liquid, spherical shape always imparts minimum surface area thereby reducing the surface tension. Hence, liquid drop... 2
- Define: Coefficient of viscosity Coefficient of viscosity is defined as the degree to which a fluid resists flow under an applied force, measured by the tangential frictiona... 1
- Describe various factors affecting viscosity of a liquid. Factors affecting viscosity of a liquid: i. Temperature: Viscosity is a temperature dependent property. Viscosity ∝ 1/ Temperature ii. Natur... 1
- Describe three daily life instances where viscosity plays an important role. Lubricating oils are viscous liquids. Gradation of lubricating oils is done on the basis of viscosity. A good quality lubricating oil does n... 1
- A balloon containing 0.6 mol of helium gas has a volume of 1.5 L. i. The volume of the balloon increases. ii. The volume of the balloon decreases. 2
- In an experiment conducted to study the diffusion of gases using same experimental conditions, following data i. Volume of gas A diffused = 50 cm³ Time required for diffusion = 7 minutes = 7 × 60 seconds Rate\ of\ diffusion\ of\ a\ gas =Volume\ of \... 1
- What makes the oil rise through the wick in an oil lamp? In an oil lamp, oil rises through the wick due to the capillary action. Such a capillary rise of oil is due to surface tension of oil. The w... 1
- Where is Dalton’s law applicable? Air is gaseous mixture of different gases. Dalton’s law is useful for the study of various phenomena in air, for example, air pollution. 1
- Do all pure gases and mixtures of gases obey the gas laws? Yes, the gas laws are also applicable to the mixtures of gases. The measurable properties of mixture of the gases such as pressure, temperat... 1
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- What can you tell us about the CSS frameworks? A CSS framework is basically a library that is made up of several CSS style sheets that can be used by web developers and web designers. It... 1
- How can you integrate CSS on a web page? You can integrate CSS on a webpage in three different ways. You can use Inline to add CSS rules to an HTML element. You can use Embedded for... 1
- Explain the CSS Box Model. The CSS Box Model is useful for creating the design and layout of web documents. It is basically a box that is made up of different properti... 1
- What are Grouping and Nesting in CSS? Grouping is used for giving the same properties to different selectors without repeating them. It is useful for reducing code by grouping se... 1
- What are the differences between HTML and CSS? HTML is also known as HyperText Markup Language. It is basically a markup language that can be used for developing web documents, websites,... 1
- What is the main difference between CSS and CSS3? CSS allows developers to give styling to web pages. You can select color, layout, fonts, and backgrounds. CSS3 stands for Cascading Style Sh... 1