Class name Subject Book title Chapter number Content Created at
Class XI Chemistry Chemistry Part-I 5 weaker. Thus, it requires less the enthalpy of fusion of ice is 6.00 kJ heat to vaporise 1 mol of acetone than it does mol -heat capacity of water ...
Class XI Chemistry Chemistry Part-I 5 reference Therefore, p∆v = ∆ng RT = 0 ∆H = ∆U = - 13.56kJ mol -1 state of an element is its most stable state of aggregation at 25°C and 1 bar pres...
Class XI Chemistry Chemistry Part-I 5 2 ethanol is formed. In contrast, the enthalpy – ∆ H  = [CaCO (s)] f 3 change for an exothermic reaction: =1 (–635.1 kJ mol –1) + 1(–393.5 kJ mol )...
Class XI Chemistry Chemistry Part-I 5 given in Table 5.2. By convention, standard enthalpy for following conventions regarding thermo-  chemical equations. formation, ∆ f , of an eleme...
Class XI Chemistry Chemistry Part-I 5 standard reaction enthalpy Then, is the sum of the standard enthalpies of ∆ H = 3(–285.83 kJ mol ) –1 the intermediate reactions into which the f 1...
Class XI Chemistry Chemistry Part-I 5 – 283.0 kJ mol (ii) –1  = –16.6 kJ mol = ½ ∆ H r 1 We can combine the above two reactions It shows that enthalpy is an extensive in such a way so ...
Class XI Accountancy Financial Accounting-I 3 to the supplier of goods worth ` 35,000. (ix) Cheque received from customer amounting to ` 75,000. (x) Withdrawn by owner for personal use ` 25,000...
Class XI Chemistry Chemistry Part-I 5 r 1 ∆ Hr+2∆ H r.3 (5.16) The combustion of one mole of benzene It can be represented as: takes place at 298 K and 1 atm. After combustion, CO (g)2a...
Class XI Chemistry Chemistry Part-I 5 rearrangement of ▯S total ▯S system ▯S surr 0 (5.19) atomsorionsfromonepatterninthereactants to another (in the products). If the structure When a ...
Class X Science Science 1 tubes (A) and (B) [Fig. 1.8 (b)]. n Also, compare the colour of the iron nails Figure 1.8 dipped in the copper sulphate solution (a)Ironnailsdipped...
Class X Science Science 1 which remains in the solution. Such reactions in which there is an exchange of ions between the reactants are called double displacement reactions....
Class X Science Science 1 substance gains oxygen or loses hydrogen during a reaction, it is oxidised. If a substance loses oxygen or gains hydrogen during a reaction, it is ...
Class X Science Science 10 and convex lenses. The upper portion consists of a concave lens. It facilitates distant vision. The lower part is a convex lens. It facilitates nea...
Class X Science Science 10 and those without communicable diseases can also donate eyes. 164 Science Reprint 2026-27 ■ Eyes must be removed within 4-6 hours after death. Info...
Class X Science Science 10 Draw a straight line PE inclined to one of the refracting surfaces, say AB, of the prism. ■ Fix two pins, say at points P and Q, on the line PE as ...
Class X Science Science 10 it has bent away from normal. Compare the angle of incidence and the angle of refraction at each refracting surface of the prism. Is this similar t...
Class XI Accountancy Financial Accounting-I 3 = 2,85,000 + 8,50,000 (1,00,000) + 1,00,000 1,85,000+ 50,000 +3,00,000 +5,00,000 +1,00,000 = 2,85,000+ 8,50,000 Total 11,35,000 = 11,35,000 Transac...
Class X Science Science 11 electric current is taken as opposite to the direction of the flow of electrons, which are negative charges. Reprint 2026-27 If a net charge Q, flo...
Class X Science Science 11 s = 300 C Q U E S T I O N S 1. What does an electric circuit mean? 2. Define the unit of current. 3. Calculate the number of electrons constituting...
Class X Science Science 11 carrying conductor when 1 joule of work is done to move a charge of 1 coulomb from one point to the other. 1 joule Therefore, 1 volt = 1 coulomb (1...
Class X Science Science 11 6 Wires crossing without joining 174 Science Reprint 2026-27 7 Electric bulb or 8 A resistor of resistance R 9 Variable resistance or rheostat or 1...
Class X Science Science 11 in Fig. 11.3. Thus, V/I is a constant ratio. In 1827, a German physicist Georg Simon Ohm (1787–1854) found out the relationship between the current...
Class X Science Science 11 × 10–8 –8 Aluminium 2.63 × 10 Tungsten 5.20 × 10–8 Nickel 6.84 × 10–8 –8 Iron 10.0 × 10 Chromium 12.9 × 10–8 Mercury 94.0 × 10–8 –6 Manganese 1.84 ...
Class X Science Science 11 increased to 120 V the current is given by V 120 V current = = = 8 A . R 15 Ω The current through the heater becomes 8 A. Example 11.5 Resistance o...
Class X Science Science 11 Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to hal...