[Download PDF] NTA JEE Main 8th April 2019 Shift 2

Instructions

For the following questions answer them individually

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 31

The percentage composition of carbon by mole in methane is:

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 32

0.27 g of a long chain fatty acid was dissolved in 100 cm$$^3$$ of hexane. 10 mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10 cm. What is the height of the monolayer?
[Density of fatty acid = 0.9 g cm$$^{-3}$$; $$\pi = 3$$]

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 33

If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength $$\lambda$$, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be: (Assume kinetic energy of ejected photoelectron to be very high in comparison to work function)

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 34

The IUPAC symbol for the element with atomic number 119 would be:

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 35

Among the following molecules/ions, $$C_2^{2-}$$, $$N_2^{2-}$$, $$O_2^{2-}$$, $$O_2$$, which one is diamagnetic and has the shortest bond length?

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 36

5 moles of an ideal gas at 100 K are allowed to undergo reversible compression till its temperature becomes 200 K. If $$C_V = 28$$ J K$$^{-1}$$, calculate $$\Delta U$$ and $$\Delta pV$$ for the process. (R = 8.0 J K$$^{-1}$$ mol$$^{-1}$$)

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 37

For the following reaction, equilibrium constants are given:
$$S(s) + O_2(g) \rightleftharpoons SO_2(g); \quad K_1 = 10^{52}$$
$$2S(s) + 3O_2(g) \rightleftharpoons 2SO_3(g); \quad K_2 = 10^{129}$$
The equilibrium constant for the reaction, $$2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$$ is:

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 38

The strength of 11.2 volume solution of H$$_2$$O$$_2$$ is:
[Given that, the molar mass of H = 1 g mol$$^{-1}$$ and O = 16 g mol$$^{-1}$$]

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 39

The covalent alkaline earth metal halide X = Cl, Br, I is:

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 40

Which of the following compounds will show the maximum 'enol' content?

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 41

Polysubstitution is a major drawback in:

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 42

Which one of the following alkenes when treated with HCl yields majorly an anti Markovnikov product?

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 43

The maximum prescribed concentration of copper in drinking water is:

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 44

Consider the bcc unit cells of the solids 1 and 2 with the position of atoms as shown below. The radius of atom B is twice that of atom A. The unit cell edge length is 50% more in solid 2 than in 1. What is the approximate packing efficiency in solid 2?

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 45

For the solution of the gases w, x, y and z in water at 298 K, the Henry's law constants (K$$_H$$) are 0.5, 2, 35 and 40 kbar, respectively. The correct plot for the given data is:

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 46

Calculate the standard cell potential (in V) of the cell in which the following reaction takes place:
Fe$$^{2+}$$(aq) + Ag$$^+$$(aq) $$\rightarrow$$ Fe$$^{3+}$$(aq) + Ag(s)
Given that $$E^{0}_{Ag^+/Ag} = x$$ V, $$E^{0}_{Fe^{2+}/Fe} = y$$ V, $$E^{0}_{Fe^{3+}/Fe} = z$$ V

Solution

NTA JEE Main 8th April 2019 Shift 2 - Chemistry - Question 47

For a reaction scheme A $$\xrightarrow{k_1}$$ B $$\xrightarrow{k_2}$$ C, if the net rate of formation of B is set to be zero then the concentration of B is given by: