Class 11th

s – block and p – block elements together are called as representative elements.

Zn (Z = 30) is a d-block element.

Frequency in the stretched wire is

$f=\frac{1}{2l}\sqrt[]{\frac{T}{\mu }}$

$f_1^2=\frac{T_1}{4\mu l^2}$

$f_2^2=\frac{T_2}{4\mu l^2}$

$\frac{T_1+T_2}{4\mu l^2}=f^2$

$f^2=f_1^2+f_1^2$

$f=\sqrt[]{{\left(80\right)}^2+{\left(150\right)}^2}=170Hz$

$Be{\left(OH\right)}_2$ is amphoteric in nature

$Be{\left(OH\right)}_2+2O{H}^{-}\to {\left. [Be{\left(OH\right)}_4\right]}^{2-}$

Generally, $?iH$ decreases down the group but Pb has higher $?iH$  than Sn due to poor shielding effect of intervening d and f orbitals.

Given beat frequency

$\left|X-95\right|=5$

$and\left|3X-290\right|=10$

$?X=100Hz$

Sulphuric acid, because of its low volatility can be used to manufacture more volatile acids from their corresponding salts.

^{$2MX+H_{2}S{O}_4\to 2HX+M_{2}S{O}_4\left(X=F,Cl,N{O}_3\right)$}

The desirable properties for handling a cooking pan is low thermal conductivity and high specific heat as it needs to quickly transmit heat and retain more heat for a given rise in temperature.

From Wien's displacement law.

${\lambda }_{m}T=b?T=\frac{2.89*{10}^{-3}}{2.5*{10}^{-6}}1.156*{10}^3$

$=1156K$

Kinetic energy $E?T$

$\frac{E_1}{E_2}=\frac{T_1}{T_2}$

$T_2=2*293$

$T_2=586K={313}^{0}C$