JEE Main 12th January 2019 Shift 1

What is the work function of the metal if the light of wavelength 4000 $$\mathring{A}$$ generates photoelectrons of velocity $$6 \times 10^5$$ ms$$^{-1}$$ from it? (Mass of electron $$= 9 \times 10^{-31}$$ kg, velocity of light $$= 3 \times 10^8$$ ms$$^{-1}$$, Planck's constant $$= 6.626 \times 10^{-34}$$ Js, Charge of electron $$= 6.626 \times 10^{-34}$$ Js)

The element with Z = 120 (not yet discovered) will be a/an

Given

On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal?

The volume of gas A is twice than that of gas B. The compressibility factor of gas A is thrice than that of gas B at same temperature. What are the pressures of the gases for equal number of moles?

For a diatomic ideal gas in a closed system, which of the following plots does not correctly describe the relation between various thermodynamic quantities?

In a chemical reaction, $$A + 2B \xrightleftharpoons{K} 2C + D$$, the initial concentration of B was 1.5 times the concentration of A, but the equilibrium concentrations of A and B were found to be equal. The equilibrium constant (K) for the chemical reaction is:

Two solids dissociate as follows: $$A(s) \rightleftharpoons B(g) + C(g)$$; $$K_{P_1} = x$$ atm$$^2$$, $$D(s) \rightleftharpoons C(g) + E(g)$$; $$K_{P_2} = y$$ atm$$^2$$. The total pressure when both the solids dissociate simultaneously is:

50 mL of 0.5 M oxalic acid is needed to neutralize 25 mL of sodium hydroxide solution. What is the amount of NaOH in 50 mL of the given sodium hydroxide solution?

What is the hardness of a water sample (in terms of equivalents of CaCO$$_3$$) containing $$10^{-3}$$ M CaSO$$_4$$? (Molar mass of CaSO$$_4$$ = 136 g mol$$^{-1}$$)

A metal on combustion in excess air forms X. X upon hydrolysis with water yields $$H_2O_2$$ and $$O_2$$ along with another product. The metal is: