***1.If two numbers are selected randomly from 20 consecutive natural numbers, find the probability that the sum of the two numbers is (i) an odd number (ii) an even number.

Explanation:

Sulphur dioxide (SO2) is an air pollutant made up of sulphur and oxygen atoms and is harmful to both plants and people. On dissolution in rain water, SO2 produces acid rain.

SO2 + 0.5O2+ H2O → H2S4

This SO3 gets converted into H2SO4 in the presence of moisture, which comes down in the form acid rain. More over consumption of SO2 causes respiratory problems to human beings.

Explanation:

Ammonia is manufactured industrially by Haber's process. A mixture of dry nitrogen and hydrogen gases in the ratio of 1:3 by volume is compressed to about 200 to 300 atm and passed over iron catalyst at a temperature of about 723 k to 773 k.

Answer:

Router. Routers help transmit packets to their destinations by charting a path through the sea of interconnected networking devices using different network topologies. Routers are intelligent devices, and they store information about the networks they're connected to.

maybe it's hub

or router

Answer:

even number between 1 and 50 are 2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48 and 50

odd number between 1 and 50 are 3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41,43,45,47,49

prime numbers between 1 and 50 are 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.

Step-by-step explanation:

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Answer:

even numbers - 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, and 50.

odd numbers - 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49.

prime numbers - 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.

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