Class 12th

A circular loop of radius R = 20 cm is placed in a uniform magnetic field B = 7 T in x-y plane as shown in figure. The loop carries a current $i=1.0\mathrm{A}$ in the direction shown in figure. The magnitude of torque acting on the loop is__ N.m. Take $\left.\pi =\frac{22}{7}\right\}$

 

HO₂C-(CH₂)₃-CH₂CO₂H $\underset{\left(2\right)N{H}_3\left(eq.\right)}{\overset{\left(1\right)1eq.ofSOC{l}_2}{\to }}{P}_1$ $\underset{+KOH}{\overset{B{r}_2}{\to }}{P}_2\underset{/redP}{\overset{B{r}_2}{\to }}$    P₃ $\underset{}{\overset{intramolecular{S}_{N^2}}{\to }}$  P₄

How many statements are correct?

A circular loop of radius R= 20cm is placed in a uniform magnetic field b= 7 T in x-y plane as shown in figure. The loop carries a current $i=1.0\mathrm{A}$ in the direction shown in figure. The magnitude of torque acting on the loop is__ N.m. Take $\left.\pi =\frac{22}{7}\right\}$

Select the incorrect statement.

Which of the following cation produces ppt. with only one of the given condition

(I) In aqueous solution produce ppt with dil. HCl

(II) In acidic aqueous solution produce ppt with H₂S

Incorrect order of Rate of Reduction among the following is:

We have taken a saturated solution of AgBr. K_sp of AgBr is 12 * 10^-14. If 10^-7 mole of AgNO₃ are added to 1 litre of this solution find conductivity (specific conductance) of this solution in terms of 10^-7 S m^-1 units.

Given:  ${\lambda }_{\left(A{g}^{+}\right)}^o=6*10^{-3}S{m}^{2}mo{l}^{-1}$  

${\lambda }_{\left(B{r}^{-}\right)}^o=8*10^{-3}S{m}^{2}mo{l}^{-1}$

${\lambda }_{\left(N{O}_3^{-}\right)}^o=7*10^{-3}S{m}^{2}mo{l}^{-1}$               

Choose the incorrect statement from the following:

Incorrectly matched reaction among the following is:

 

The cell shown below generates a potential of 0.643 V at 300K. Find (log K_sp) for AgBr:    

$Ag\left|AgBr\left(s\right)\right|NaBr\left(0.1M\right)\left|\right|AgN{O}_3\left(0.1M\right)|Ag$ $\left[Take\frac{2.303RT}{F}=0.06\right]$