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 Chemistry Practical Questions 2023 Important questions of chemistry practical 2023 available in all format   1. What is the colour of phenolphthalein in acidic and alkaline medium? Ans. Colourless in acidic and pink in alkaline medium. 2. What is fusion mixture? Ans. Equimolar mixture of Na₂CO3 and K₂CO₂ 3. What is sodalime? Ans. A mixture of NaOH and CaO. 4. Which salt produces white incrustation and emits garlic-like smell, when heated in charcoal block in a reducing flame? Ans. Arsenic (As) compound.

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 1. Give an example of an  man alloy, in which the resistance and Stesistivity remain practically unchanged with increase in temperature . Ans .Magarin in an example of an alloy that does not allow the resistance and resistivity remain particularly unchanged with increase in temperature. 2. Give an example of a substance in which resistance and resistivity decrease with increase in temperature? Ans.Silion and Germanion . 3. What do you mean by Combination of resistence? The current through an electrical circuit depends on the resistence of a circuit. So, to have a desired value of a current through a circuit , two or More resistances are connected together. 4. What is equivalent resistance? The equivalent resistance defined as a common point or nodes where the total resistance are measured in series or parallels quivalent. 5.What is series Combination? When two or more resistors are Connected end to end consecutively, then they are said to be series combination. 6. What is par...

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  ECHINODERMATA   Definition : Echinodermata represents the group of marine invertebrate true coelomate deuterostomus animals with pentamarous radially symmetrical adult body having calcareous ossicles and spines, characteristic water vascular system showing bottom dwelling habit. Salient Characters of Echinodermata 1. Adult body is radially symmetrical with pentamerous organization. 2. Triploblastic in nature with true coelom. 3. Body with distinct oral and aboral surface. 4. Presence of calcareous plates or ossicles as endoskeleton in the body. 5. Presence of spacious coelom with peritoneal lining. 6. Presence of characteristic water vascular system. 7. Presence of ambulacral groove in most of the cases. 8. Tube feet as locomotory organs. 9. Alimentary canal is usually a coiled tube. 10. Presence of haemal or blood lacunar system. 11. Nervous system diffuse and primitive type consisting of networks concentrated into ganglionated radial nerve cords. 12. Excretory system wanti...

  PTERIDOPHYTE   Definition : Seedless vascular cryptogams where the sporophytic plant body is differentiated into true root, stem and leaves are called pteridophytes. General Characteristics : 1. Plant body is sporophyte which is differentiated into true stem, leaves and roots. 2 They occur in a variety of habitats. Mostly they are terrestrial plants and grow well in abundant moisture and shaded localities. A few are aquatic, some others are epiphytic. 3. Primary roots are short-lived and are soon replaced by adventitious roots. 4. The stem is rhizomatous, branching is dichotomous or monopodial in some cases. 5. Leaves are of two types-microphyllous and megaphyllous. Microphyllous leaves are simple, small and have a single central vein not associated with leaf gap (e.g., Lycopodium, Selaginella). Megaphyllous leaves are compound, large-sized associated with leaf gap and are supplied with vascular bundles (e.g., Pteris). A. Adiantum .  B. Dryopteris .    C.Spor...

Q .  In how many ways can 10 H.S. students and 7 B.Com. students be arranged in a line so that no two B.Com. students may sit together ?   Solution Clearly, 10 H.S. students can be arranged among themselves in (10)! ways. For each of these (10)!  arrangements of H.S. students, no two B.Com. students willc pcupy their seats in consecutive positions if they are placed in between or at the two extremes of the H.S. students. Clearly, there are 11 such places where 9 places in between and 2p laces at the two extremes; where B.Com. students can be placed as follows [ H,"H,°H,"H,°"H,°H,"H,°H,°H,°H0 Here, H,H,HH10 represents a particular arrangement of 10 H.S. students and B.Com. students are to be placed in places shown by".] Now, 7 B.Com. students can be placed in these 11 places in P¹¹ ways. Therefore, the required number of arrangements=(10)! x"P7

    1   How many numbers of not more than 4 digits can be formed with the digits ,   2, 3 and 4,  repetitions being allowed ? Solution:- Satisfying the restriction imposed in the problem we can form 1-digit or 2-digit or 3-digit or 4-digit numbers. digits occupy To find the no. of 1-digit numbers, we note that, 4 different digits are given; so, the no. of 1 -digit numbers is 4. To find the no. of 2-digit numbers we note that the unit's place can be filled up in 4 ways, for any one of the 4 different digits can be placed there. For each of these 4 ways the ten's place can also be filled up in 4 ways as repetition of digit   is allowed.  the no. of 2-digit numbers = 4.4 = 42 = 16. Arguing in the same way we have, no. of 3-digit numbers = 43 = 64 and no. of 4-digit numbers = 4⁴ = 256. Hence, the required no. of numbers = 4+ 16+64 +256 = 340.

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 1. Explain Graphically the relationship of TU, AU and MU?  Ans. There are three types of Utility: • Total Utility (TV) • Marginal Utility (MU) • Average Utility (AU) • Total Utility : The Utility which a consumer obtains by Consuming all units of a commodity Particular Period of time is called total utility (TU). TU = ( Utility derived from unit 1 + Utility derived from unit 2+........Utility derived from unitn) TU = (Un + Un₂ +........Unn) • Marginal Utility : The utility which consumer obtains by Consuming extra unit of a commodity is called marginal utility (MU). Marginal utility is the change in total utility due to change in unit of consumption of commodity. Margial Utility = change in total utility / change in whit consumption of commodity. • Average Utility : AU as the name by total utility divided suggests it is the units of commodity Consumed. AU= Total Utility / units of Commodity Consumed. It is satisfaction enjoyed by the Consumer from per unit Commodity Consume...