Ncert Solutions Chemistry Class 11th

Vitamin E is helpful in delaying blood clotting while vitamin K help blood clotting.

W = 4.5 g

M.W = 90

V = 250 ml

Using M = $\frac{W}{M.W*V}*1000$  

$M=\frac{4.5}{90*250}*1000=0.2$  

M = 2 * 10^-1 M

So, x = 2

Mass of Na⁺ in 50 ml = 70 * 50 = 3500 mg

23000 mg of Na⁺ is present in 85000 mg of NaNO₃ (1 mole NaNO₃ contains 1 mole Na⁺)

$\therefore 3500$ mg Na⁺ will be present in   $\frac{85000}{23000}*3500$

= 12934.78 mg

= 12.93478 gm

$\cong 13$        

pH = $\frac{1}{2}\left[p{K}_w+p{K}_a-p{K}_b\right]$ $\frac{}{}{}_{}{}_{}{}_{}$

$=\frac{1}{2}\left[14+4.75-5.23\right]$

$=6.76\cong 7$

Uncertainty in speed = 90 $*\frac{5}{100}=4.5m/s=\Delta V$ $\frac{}{}$

$\Delta x=\frac{h}{4\pi m\Delta V}=\frac{6.63*10^{-34}}{4*3.14*10^{-2}*4.5}=1.173*10^{-33}$

the nearest integer is 1

Methane gas is produced during anaerobic degradation of vegetation that leads to global warming so considered as greenhouse gas like CO₂. Also it causes cancer.

In both reactions H₂O₂ act as reducing agent

In reaction (A)       HOCl – O.A

H₂O₂ – R.A

In reaction (B)       I₂ – O.A

H₂O₂ – R.A

Tritium is radioactive and it decays into He³ during emission of β-radiation

W = 4.75 g

$n=\frac{4.75}{26}$ T = 323 K, R = 0.0826

  $P=\frac{740}{760}atm$          

 V = $\frac{nRT}{P}=\frac{4.75*0.0826*323}{26\left(\frac{740}{760}\right)}=5litre$