NTA JEE Main 10th April 2023 Shift 1

Which of the following is used as a stabilizer during the concentration of sulphide ores?

Given below are two statements:
Statement I: Aqueous solution of K$$_2$$Cr$$_2$$O$$_7$$ is preferred as a primary standard in volumetric analysis over Na$$_2$$Cr$$_2$$O$$_7$$ aqueous solution.
Statement II: K$$_2$$Cr$$_2$$O$$_7$$ has a higher solubility in water than Na$$_2$$Cr$$_2$$O$$_7$$. In the light of the above statements, choose the correct answer from the options given below:

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to

Which of the following statements are correct?
(A) The M$$^{3+}$$/M$$^{2+}$$ reduction potential for iron is greater than manganese.
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion
(C) Aqueous solution of Cr$$^{2+}$$ can liberate hydrogen from dilute acid
(D) Magnetic moment of V$$^{2+}$$ is observed between 4.4-5.2 BM
Choose the correct answer from the options given below:

The octahedral diamagnetic low spin complex among the following is

Identify the correct order of reactivity for the following pairs towards the respective mechanism

(A)

(B)

(C) Electrophilic substitution

(D) Nucleophilic substitution

Choose the correct answer from the options given below:

Suitable reaction condition for preparation of Methyl phenyl ether is

Isomeric amines with molecular formula C$$_8$$H$$_{11}$$N give the following tests
Isomer P $$\Rightarrow$$ Can be prepared by Gabriel phthalimide synthesis
Isomer Q $$\Rightarrow$$ Reacts with Hinsberg's reagent to give solid insoluble in NaOH
Isomer R $$\Rightarrow$$ Reacts with HONO followed by $$\beta$$-naphthol in NaOH to give red dye.
Isomers P, Q and R respectively are

Match List-I with List-II.

The one that does not stabilize 2$$^\circ$$ and 3$$^\circ$$ structures of proteins is