Maths Exemplar Solutions Ncert Class Ix

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Class Ix Chapter 4 Structure Of Atom Ncert Solutions Page 47 Q1
class ix chapter 4 structure of atom ncert solutions page 47 q1
Its electronic conigiration = 2, 8, 6 Valency of S = 8 – 6 = 2 Magnesium: At. no. of Mg = 12 Its electronic configuration = 2, 8, 2 Valency of Mg = 2 Concept insight: As we know, when the outermost shell of an atom contains 4 or less than 4 electrons, its valency is equal to the number of valence electrons in the outermost shell. Page 52 Q1. If number of electrons in an atom is 8 and number of protons is also 8, then (i) what is the atomic number of the atom? and (ii) what is the charge on the atom? Ans. .

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PDF pages: 14, PDF size: 0.21 MB
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Ncert Class Mathematics (size: 5.1m) Examrace
ncert class mathematics (size: 5.1m) examrace
2.2. In fact, for any quadratic polynomial ax2 + bx + c, a 0, the graph of the corresponding equation y = ax2 + bx + c has one of the two shapes either open or open upwards like downwards like depending on whether a > 0 or a <(These curves are called parabolas.) You can see from Table 2.1 that –1 and 4 are zeroes of the quadratic polynomial. Also note from Fig. 2.2 that –1 and 4 are the x-coordinates of the points where the graph of y = x2 – 3x – 4 intersects the x- axis. Thus, the zeroes of the .

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PDF pages: 369, PDF size: 5.08 MB
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Ncert Class Mathematics Problems (size: 2.5m Examrace
ncert class mathematics problems (size: 2.5m examrace
. system of education. The textbooks for Classes IX and XI were released in 2006 and for Classes X and XII in 2007. Overall.

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PDF pages: 344, PDF size: 2.46 MB
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Ncert Class Mathematics (size: 5.9m) Examrace
ncert class mathematics (size: 5.9m) examrace
1. Use the given digits without repetition and make the greatest and smallest 4-digit numbers. (a) 2, 8, 7, 4 (b) 9, 7, 4, 1 (c) 4, 7, 5, 0 (d) 1, 7, 6, 2 (e) 5, 4, 0, 3 (Hint : 0754 is a 3-digit number.)Now make the greatest and the smallest 4-digit numbers by using any one digit twice. (a) 3, 8, 7 (b) 9, 0, 5 (c) 0, 4, 9 (d) 8, 5, 1 (Hint : Think in each case which digit will you use twice.)Make the greatest and the smallest 4-digit numbers using any four different digits with conditions as given. (a) .

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PDF pages: 322, PDF size: 5.86 MB
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Ncert Class Mathematics (size: 4.5m) Examrace
ncert class mathematics (size: 4.5m) examrace
Subtraction is opposite of addition and therefore, we add the additive inverse of the integer that is being subtracted, to the other integer. For example: (a) 56 – 73 = 56 + additive inverse of 73 = 56 + (–73) = –17 (b) 56 – (–73) = 56 + additive inverse of (–73) = 56 + 73 = 129 (c) (–79) – 45 = (–79) + (– 45) = –124 (d) (–100) – (–172) = –100 + 172 = 72 etc. Write atleast five such examples to verify this statement. Thus, we find that for any two integers a and b, a – b = a + additive inverse of b = a + .

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PDF pages: 314, PDF size: 4.45 MB
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