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`4 - (-2)`

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KMnO_(4) + H_(2)SO_(4) + H_(2)C_(2)O_(4) rarr K_(2)SO_(4)+MnSO_(4) + CO_(2) + H_(2)O . Balance this equation.

Balance the equation : SO_(2) + Na_(2)CrO_(4) + H_(2)SO_(4) rarr Na_(2)SO_(4) + Cr_(2)(SO_(4))_(3) + H_(2)O

Identify the like terms abc, 3a^2 , 4b^2 , -7/4 ab ,-a^2, -b^2, -4a^2 , 7abc.

Fractorise 4a ^(2) + b ^(2) + c ^(2) -4ab + 2bc-4ca using suitable identity.

What is the mole coefficient of H_(2)SO_(4) in the balanced equation. K_(2)Cr_(2)O_(7) + FeSO_(4) + H_(2)SO_(4) rarr K_(2)SO_(4) + Fe_(2)(SO_(4))_(3) + Cr_(2)(SO_(4))_(3) + H_(2)O

In a graph Sheet Plot each pair of points, join them by line segments (i) (2,5), (4,7) (ii) (-3, 5), (-1, 7) (iii) (-3, -4), (2,-4) (iv) (-3, -5), (2, -5) (v) (4,-2), (4,-3) (vi) (-2,4), (-2,3) (vii) (-2, 1), (-2,0) Now join the following pairs of points by straight line segments, in the same graph. (viii) (-3,5), (-3,4) (ix) (2,5), (2,-4) (x) (2,-4),(4,-2) (xi) (2,-4), (4,-3) (xii) (4,-2), (4,7) (xiii) (4,7), (-1, 7) (xiv) (-3,2), (2,2) Now you will get a surprise figure. What is it?

Find all common tangents of the pairs of circles x^(2) +y^(2) +4x + 2y -4 =0 and x^(2) +y^(2) -4x -2y +4=0

y^(2)=4x, y^(2)=4(4-x)