SOLUTION

SOLUTION

H - C Ξ C - H
1σ and 2π bonds between carbon atoms

SOLUTION

In [Cr(H₂O)]Cl₃, let oxidation number of Cr be x, Here the molecule separates as its ions as, [Cr(H2O)]³⁺ and  3Cl⁻. As H₂O is a neutral molecule its oxidation number is zero. Hence, x=+3 

In [Cr(C₆H₆)₂] let oxidation number of Cr be y, Benzene is a neutral molecule and hence on observing the cross multiplied factor we get the oxidation number of Cr as 0. Hence,y=0 

In K₂[Cr(CN)₂(O)₂(NH₃)],let oxidation number of Cr be z, Here the ions are- 2K+ and [Cr(CN)₂(O)₂(NH₃)]²⁻. As  NH3 is neutral molecule and O−and  CN− is 2×(−1)+4×(−1)=−6 and hence oxidation number of Cr is, z-6=-0?z=+6

Solution

F = m x a

F = 1200 x -100, ==> F = -120000 N (- sign indicted in the opposite direction)

SOLUTION

M1V1+M2V2=MxVx

Where, V1→ Volume of the gicen HCl solution =10ml

M1→[H+]ion concentration in given HCl solution =10−4

V2→Volume of water required

M2→[H+] ion concentration in water =10−7

Mx→[H+] ion concentration required =10−5

Vx→Total volume=(10+V2)

∴(10−4×10)+(10−7×V2)=10−5(10+V2)

Solving, we get,

              V2 = 90ml

Solution

Prolactin is the hormone that produces milk in the mammary glands. 

GnRH (gonadotropin releasing hormone) of hypothalamus stimulate the release of gonadotropins (FSH and LH)

FSH is responsible for the development of follicles in ovary while

LH promotes maturation of Graffian follicle.

Developing follicles secrete estrogen and progesterone. LH surge at day 14 of menstrual cycle causes rupturing of Graffian follicle and released of the ovum (ovulation).
The ruptured graffian follicle develops into Corpus luteum. Progesterone is secreted by corpus luteum (the ovulated follicle) during first three months of pregnancy and by the placenta during next 6 months. It prepares the uterus for implantation, thickens the uterine endometrium during pregnancy

Solution

Bast fibers are mostly found in Secondary phloem Bast fibre is the fibres obtained by the phloem of dicots plants. They support the conductive cells of the phloem and provide strength to the stem.

SOLUTIONS

NH₂ – NH₂ – HCl does not give Lassaigne’s test as it does not contains carbon. Lassaigne’s test is given by only those nitrogenous compounds in which both carbon and nitrogen is present