[Download PDF] NTA JEE Main 12th January 2019 Shift 1

Instructions

For the following questions answer them individually

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 31

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)

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 32

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

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 33

Given

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

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 34

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?

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 35

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

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 36

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:

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 37

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:

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 38

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?

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 39

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$$^{-1}$$)

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 40

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:

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 41

Among the following four aromatic compounds, which one will have the lowest melting point?

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 42

The correct order for acid strength of compounds $$CH \equiv CH$$, $$CH_3 - C \equiv CH$$ and $$CH_2 = CH_2$$ is as follows:

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 43

The major product of the following reaction is:

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 44

Water samples with BOD values of 4 ppm and 18 ppm, respectively, are:

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 45

The molecule that has minimum or no role in the formation of photochemical smog, is:

Solution

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 46

The freezing point of a 4% aqueous solution of X is equal to the freezing point of a 12% aqueous solution of Y. If the molecular weight of X is A, then the molecular weight of Y will be

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 47

The standard electrode potential E° and its temperature coefficient $$\left(\frac{dE}{dT}\right)$$ for a cell are 2 V and $$-5 \times 10^{-4}$$ V K$$^{-1}$$ at 300 K, respectively. The reaction is Zn(s) + Cu$$^{2+}$$(aq) $$\to$$ Zn$$^{2+}$$(aq) + Cu(s). The standard reaction enthalpy $$(\Delta_r H^-)$$ at 300 K in mol$$^{-1}$$ is [Use R = 8 J K$$^{-1}$$ mol$$^{-1}$$ and F = 96,500 C mol$$^{-1}$$]

NTA JEE Main 12th January 2019 Shift 1 - Chemistry - Question 48

Decomposition of X exhibits a rate constant of 0.05 $$\mu$$g/year. How many years are required for the decomposition of 5 $$\mu$$g of X into 2.5 $$\mu$$g?