JEE Main 2021 (18 March Shift 1)

A certain orbital has no angular nodes and two radial nodes. The orbital is:

The ionic radius of Na$$^+$$ ions is 1.02 angstrom. The ionic radii (in $$\mathring{A}$$) of Mg$$^{2+}$$ and Al$$^{3+}$$, respectively, are:

Given below are two statements: One is labelled as Assertion A and the other labelled as reason R.
Assertion A: During the boiling of water having temporary hardness, Mg(HCO$$_3$$)$$_2$$ is converted to MgCO$$_3$$.
Reason R: The solubility product of Mg(OH)$$_2$$ is greater than that of MgCO$$_3$$.
In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II:
List-I                                                              List-II
(a) Ca(OCl)$$_2$$                                         (i) Antacid
(b) CaSO$$_4$$ . $$\frac{1}{2}$$H$$_2$$O                               (ii) Cement
(c) CaO                                                    (iii) Bleach
(d) CaCO$$_3$$                                             (iv) Plaster of paris
Choose the most appropriate answer from the options:

Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of:

Compound with molecular formula C$$_3$$H$$_6$$O can show:

The statements that are TRUE:
(A) Methane leads to both global warming and photochemical smog
(B) Methane is generated from paddy fields
(C) Methane is a stronger global warming gas than CO$$_2$$
(D) Methane is a part of reducing smog
Choose the most appropriate answer from the options given below:

In a binary compound, atoms of element A form a hcp structure and those of element M occupy 2/3 of the tetrahedral voids of the hcp structure. The formula of the binary compound is:

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is: