A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3 $$\times$$ 10¹⁴ Hz. The velocity of ejected electron is ____________ $$\times$$ 10⁵ ms^$$-$$1 (Nearest integer)

[Use : h = 6.63 $$\times$$ 10^$$-$$34 Js, m_e = 9.0 $$\times$$ 10^$$-$$31 kg]

For the galvanic cell,

Zn(s) + Cu²⁺ (0.02 M) $$\to$$ Zn²⁺ (0.04 M) + Cu(s),

E_cell = ______________ $$\times$$ 10^$$-$$2 V. (Nearest integer)

[Use : $$E_{Cu/C{u^{2 + }}}^0$$ = $$-$$ 0.34 V, $$E_{Zn/Z{n^{2 + }}}^0$$ = + 0.76 V, $${{2.303RT} \over F} = 0.059\,V$$]

100 mL of Na₃PO₄ solution contains 3.45 g of sodium. The molarity of the solution is _____________ $$\times$$ 10^$$-$$2 mol L^$$-$$1. (Nearest integer)

[Atomic Masses - Na : 23.0 u, O : 16.0 u, P : 31.0 u]

The overall stability constant of the complex ion [Cu(NH₃)₄]²⁺ is 2.1 $$\times$$ 10¹³. The overall dissociations constant is y $$\times$$ 10^$$-$$14. Then y is __________. (Nearest integer)