रासायनिक अभिक्रियाएं एवं समीकरण - L17 | NCERT Discussion Part 2 | CLASS10 विज्ञान | 8AM Nishtha mam

Class 10 Science (Hindi) | Chapter 1 | रासायनिक अभिक्रियाएँ एवं समीकरण | Important Questions | Quick Revision

A mixture of 1.57 mol of N_(2) ,1.92 mol of H_(2) and 8.17 mol of NH_(3) is introduced in a 20 L reaction vessel at 500 K. At this temperature, the equilibrium constant K_(c) for the reaction is 1.7 xx 10^(-2) . Is the reaction at equilibrium? The reaction is N_(2)(g)+3H_(2)(g) rarr 2NH_(3)(g)

The following data : 2, 5, 15, 25, 20, 12, 8, 7, 6, 16, 21,17, 30, 32, 23, 40, 51, 15, 2, 9, 57, 19, 25 is grouped in the classes 0 –5, 5 –10, 10 –15 etc. Find the frequency of the class 20 –25.

A block A of mass 2 kg is placed over another block B of mass 8 kg and supported by a ledge L fixed on block B on its smooth surface as its extended part. If a force F=100 N is applied on block B , it starts moving on rough horizontal surface. Find the force exerted by block B on is 25 N . (Take g=10m//s^(2) )

Which two signs should be interchanged in the following equation to make it correct? निम्नलिखित समीकरण को सही बनाने के लिए कौन से दो चिन्हों को आपस में बदलना होगा ? 40 + 10 div 2 xx 8 - 17 = 17

Ratio of the fares of First ,Second and Third class catogory of a train , between two stations is 10:7:2 and the ratio of passenger travelling in these category is 4:9:17 respectively .If the fare is increased by 1/4 in First class , 1/8 in second class and decreased by 10% i Third Class and the ratio of number of passenger in the category remains same .If the total amount received of Rs. 60590 , then find the total amount received from thrid class category .

Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5 - 10. (ii) How many children watched television for 15 or more hours a week?

Directions : Consider the following for the. next three (3) questions that follow : In a frequency distribution having class intervals 0-10, 10-20, 20-30 and 30-40, the respective frequencies are X, x + 8, x - 2 and x - 4 and the arithmetic mean of the distribution is 17.8 The modal class is-

(a) A wire of resistance R, length l and area of cross-section A is cut into parts, having their lengths in the ratio 1:2. The shorter wire is now stretched till its length becomes equal to that of the longer wire. If they are now connected in parallel, find the net resistance of the combination. (b) Write the name of the materials having resistivity of the order of (i) 1.7 xx 10^(-8) Omega m and (ii) 10^(15) Omega m at 0 ""^(@)C .