# Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow it in 4 hours. How long will Sohan take to mow the lawn if he works alone?

Updated On: 20-8-2020

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A decimolar solution of potassium ferrocyanide is

50%

dissociated at

300K

. Calculate osmotic pressure of the solution. (Given

S = 8.341 JK^(-1) mol^(-1)

)

In hydrogen atom, the electron makes

6.6 xx 10^(15)

revolutions per second around the nucleus in an orbit of radius

0.5 xx 10^(-10)m

. It is equivalent to a current nearly

A B C

is a triangle.

D

is the mid point of

B Cdot

If

A D

is perpendicular to

A C ,

then prove that

cos A\ dotcos C=(2(c^2-a^2))/(3a c)

.

Why must vitamin C be supplied regularly in diet?

Simplify each :

(4x+2y)^3-\ (4x-2y)^3

Match the items given in Column I with those in Column II and select the correct option given below <br>

{:(,"Column I",,"Column II"),((A),"Fibrinogen",(i),"Osmotic balance"),((B),"Globulin",(ii),"Blood clotting"),((C),"Albumin",(iii),"Defence mechanism"):}

The height of a right circular cylinder is

10. 5.

Three times the sum of the areas of its two circular faces is twice the area of the curved surface. Find the volume of the cylinder.

Express the following ratios in the language of daily life: (i) In an examination, the ratio of the number of students passing the examination to the total number of students that appeared in the examination is 4:5. (ii) Water is formed by combining volumes of oxygen and hydrogen in the ratio 1:2. (iii) To dilute an acid, students were asked to mix acid and water in the ratio 2:3.

The rate of disappearance of

SO_(2)

in the reaction

2SO_(2) + O_(2) rarr 2SO_(3)

is

1.28 xx 10^(-3) g//sec

then the rate of formation of

SO_(3)

is

<img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/KSV_CHM_ORG_P2_C12_E01_066_Q01.png" width="80%"> <br> The compound (E ) is:

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