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- While driving along an unbanked circular road, a two-wheeler rider has to lean with the vertical. (i) When a bicyclist takes a turn along an unbanked road, the force of friction Fs provides the centripetal force; the normal reaction of th... 1
- Why is it useful to define radius of gyration? Radius of gyration is defined as the distance from the axis of rotation to a point where the total mass of the body is supposed to be concen... 2
- Distinguish between crystalline solids and amorphous solids. Crystalline solids Amorphous solids They have definite characteristic geometrical shape as constituent particles are arranged in orderly reg... 1
- What are diamagnetic substances? The diamagnetic materials are those materials which weakly repel the external magnetic field. 1
- Name the bravais lattice in the triclinic system The bravais lattice in the triclinic system is a simple or primitive unit cell. 1
- Write the effect on density of a substance in the Frenkel defect? The density remains unchanged in Frenkel defect. In the frenkel defect an ion takes a place at an interstitial position. Hence there is no i... 1
- E. What is the stationary phase in Paper Chromatography? Paper chromatography is a type of partition chromatography in which a special quality paper, namely Whatman paper 1 is used. The water trapp... 1
- D. Why is paper moistened before filtration? The filter paper is moistened Before filtration with an appropriate solvent to ensure that it sticks to the funnel and does not let the air... 1
- C. Why is a condenser used in distillation process? Condensers are often used in reflux, where the hot solvent vapors of a liquid being heated are cooled and allowed to drip back. Condensers a... 1
- B. What do you understand by the terms a. residue b. filtrate. Residue: In the process of filtration, the insoluble (undissolved) impurities which remain on the filter paper are called the residue. Filtr... 1
- A. Which of the following techniques is used for purification of solid organic compounds? (a) Crystallization Crystallization is used for purification of solid organic compound. In this technique, substances are dissolved in the h... 1
- E. Colourless components on chromatogram can not be observed by the following : d. Using infrared light 2
- D. A mixture of acetone and benzene can be seperated by the following method : b. Fractional distillation 2
- C. Which technique is widely used in industry to seperate components of mixture and also to purify them ? b. Chromatography 2
- B. Which of the following techniques is used for seperation of glycerol from soap in soap industry ? a. Distillation under reduced pressure 2
- A. Which of the following methods can be used to seperate two compounds with different solubilities in the same solvent? a. Fractional crystallization 2
- Define Analytical chemistry. Why is accurate measurement crucial in science? The accuracy of measurement is of a great concern in analytical chemistry. This is because faulty equipment, poor data processing or human e... 2
- Why does molarity of a solution depend upon temperature ? Molarity is the number of moles of the solute present in 1 litre of the solution. Therefore, molarity depends on the volume of the solution.... 1
- Why there is a need of rounding off figures during calculation ? When performing calculations with measured quantities, the rule is that the accuracy of the final result is limited to the accuracy of the l... 1
- Define : Stoichiometry Calculations based on a balanced chemical equation are known as stoichiometric calculations 2
- Explain the following terms (a) Mole fraction (b) Molarity (c) Molality Mole fraction: It is the ratio of number of moles of a particular component of a solution to the total number of moles of the solution. If a... 1
- What do you mean by SI units ? What is the SI unit of mass ? In 1960, the general conference of weights and measures proposed revised metric system, called International system of Units i.e. SI units,... 1
- What is a limiting reagent ? Explain. Limiting reagent: i. The reactant which gets consumed and limits the amount of product formed is called the limiting reagent. ii. When a che... 1
- Explain the terms percentage composition, empirical formula and molecular formula. Percentage composition: The percentage composition of a compound is the percentage by weight of each element present in the compound. Quanti... 1