Chemistry

After removal A = 4 - $\left(\frac{1}{2}*2\right)=3$  

              After removal B = 4 – 1 = 4 (only two atoms are removed)

              Final formula of the compound = A₃B₄

(a) Li → used in bearings for motor engine.
(b) Na → used as coolant in fast breader nuclear reactor.
(c) K → used as absorbent of CO?
(d) Cs → used in photoelectric call.

Only in n = 2 → n = 1 (one single type of photon is emitted)

$C{H}_4+2O_2\to C{O}_2+2H_{2}O$

Mole $\frac{100}{16}\frac{208}{32}$

$\begin{array}{l}\downarrow \downarrow \\ 6.256.5(Here{O}_{2}isthelimitingreagent)\end{array}$  

Hence mole of CO₂ formed = $\frac{6.5}{2}$  

And wt of CO₂ in gm = $\frac{6.5}{2}*44=143g$  

Meq of K? Cr? O? is greater than all the other given species.

Bromine water test is a technique used for the identification of alkynes. Alkynes on coming in contact with bromine turn them colourless from reddish brown color. This happens because of the addition reaction which takes place due to the triple carbon bonds of alkynes.

Diazonium salts of aromatic amines are more stable

Lactose is a disaccharide which is formed by forming C? -C? glycosidic linkage between D-galactose and D- glucose.
Lactose - (Hydrolysis)-> D - galactose + D - glucose