Physics, Chemistry, Mathematics Forums

Please find the file in attachment and reply with full explanation.

Q.A metal oxide has the formula Z₂O₃ . It can be reduced by hydeogen to give free metal and water. 0.1596g of the metal oxide requires 6mg of hydrogen for complete reduction. The atomic weight og metal is ?
Ans.55.8
Please reply with full explanation.

hello sir and buddies i want  to know the solution of the following quetions as soon as possible..

1)the real part of sin(a+ib) is:

a)sina {(e^x+e^-x)/2}

b)cosa {(e^x+e^-x)/2}

c)sin a

d)none of this

2)if IzI=MAX{Iz-1I,Iz+1I} then

a)Iz+zI=1/2

b)z+z=1

c)Iz+zI=1

d)none of this

here z stands for conjugate of z. I I for mod

A rectangle PQRS has its side PQ parallel to the line y=mx and vertices P,Q and S on the lines y= a x = b,x = - b respectively. Find the locus of the vertex R.

Please reply with explanation..

passage
0.1mole of a weak acid is dissolved on 500g of water.the degree of ionizatoin of the acid HX is 0.3.The colligative properties were found to be in accordance with those of an ideal solution.
Kb for water is 0.52K/m,Kf for water is 1.86K/m

1.The vapour pressure of water is dropped by
(a) 0.65% (b) 1.3% (c) 8.5% (d) 13.0%

2.Van't Hoff factor for the acid is
(a) 0.13 (b) 1.03 (c) 1.06 (d) 1.3

3.The freezing point depression of the solution
in degree is
(a) 0.372 (b) 0.242 (c)0.484 (d) 0.186

please give complete solution with method

ANSWERS: 1.(b)
2.(d)
3.(c)

If p₁ and p₂ are the lengths of the normals drawn from the origin on the lines
xcosΘ + ysinΘ = 2acos4Θ and xsecΘ + ycosecΘ = 4acos2Θ respectively and
mp₁² + np₂² = 4a², then find the value of m and n.

what is a capacitor?explain its need.

Hi to all of you guys here…
May this thread fits on this section. A friend of mine gave me this enigma. It is written in Excel format. Since here I can’t attach (.xls) file more than 100 KB, I don't know how to put the file, name Enigma.xls.
There are infinite amount of tables, with ten rows (row 0,1,2,….9) each. Inside of each tables, there are numbers from 1 to 92, 93 to 184, 185 to 276, and 277 to 284, which lying on their certain rows. Here I gave the example tables that have been filled in for 40 tables. By finding the patterns/ formulas, my friend asked me to extend the tables to fill in the blank tables 41,42,43,etc as given beneath of Table 40. Just like SUDOKU, in each tables there will be no same numbers vertically, horizontally and diagonally. If these tables are using permutations from an ideal table that you can see beneath Table 40 (supposed the ideal table was right), then how to find the formulas of its permutations?
Can somebody help me about this?
Thx.
Hope my English is good enough for explaining this.

Why 4-bromo butan- 1-ol can not be used to prepare Grignard reagents?What are the necessary conditions for an alcohol to be used to prepare the Grignard reagents?

Please refer to the link for the question.