Change in size in maximum in which process?
a) `O to O^+`
b) `O to O^-`
c) `O^+ to O^-`
d) `O^+ to O^(2-)`

Which of the following species has the smallest size? (a) K^(o+), Sr^(2+), Ar , (b) Si, P, Cl , (c ) O, O^(ө), O^(2-)

A B C D is a parallelogram and O is any point in its interior. Prove that: (i) a r\ ( A O B)+a r\ (C O D)=1/2\ a r(A B C D) (ii) a r\ ( A O B)+\ a r\ ( C O D)=\ a r\ ( B O C)+\ a r( A O D)

A B C D is a trapezium in which AB is parallel to CD . The diagonals A C and B D intersect at O . Prove that (i) A O B ~ C O D (ii) If O A=6c m , O C=8c m , Find: (A r e a\ ( A O B))/(A r e a\ ( C O D)) (b) (A r e a\ ( A O D))/(A r e a\ ( C O D))

If the matrix A B is zero, then It is not necessary that either A=O or, B=O (b) A=O or B=O (c) A=O and B=0 (d) all the above statements are wrong

In Figure, find x . Further find /_B O C ,\ /_C O D\ a n d\ /_A O D .

Which of the following are green house gases ? (a) CO_2 (b) O_2 (c) O_3 (d) CFC (e) H_2O

Diagonal A C\ a n d\ B D of trapezium A B C D , in which A B || D C , intersect each other at Odot The triangle which is equal in area of A O D is A O B (b) B O C (c) D O C (d) A D C

Let O be the origin and let PQR be an arbitrary triangle. The point S is such that vec O Pdot vec O Q+ vec O Rdot vec O S= vec O Rdot vec O P+ vec O Qdot vec O S= vec O Q . vec O R+ vec O Pdot vec O S Then the triangle PQ has S as its: circumcentre (b) orthocentre (c) incentre (d) centroid

If O\ a n d\ O^(prime) are circumcentre and orthocentre of \ A B C ,\ t h e n\ vec O A+ vec O B+ vec O C equals a. 2 vec O O ' b. vec O O ' c. vec O ' O d. 2 vec O ' O

Let A B C D be a parallelogram whose diagonals intersect at P and let O be the origin. Then prove that vec O A+ vec O B+ vec O C+ vec O D=4 vec O Pdot