NTA JEE Main 27th July 2021 Shift 1

Given below are two statements:
Statement I : Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom.
Statement II : Bohr's model of hydrogen atom contradicts Heisenberg's uncertainty principle.
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) NaOH       (i) Acidic
(b) Be(OH)$$_2$$   (ii) Basic
(c) Ca(OH)$$_2$$   (iii) Amphoteric
(d) B(OH)$$_3$$  
(e) Al(OH)$$_3$$
Choose the most appropriate answer from the options given below:

Given below are two statements: One is labelled as Assertion A and the other labelled as Reason R.
Assertion A : Lithium halides are somewhat covalent in nature.
Reason R : Lithium possess high polarisation capability.
In the light of the above statements, choose the most appropriate answer from the options given below:

The oxidation states of $$P$$ in H$$_4$$P$$_2$$O$$_7$$, H$$_4$$P$$_2$$O$$_5$$ and H$$_4$$P$$_2$$O$$_6$$, respectively, are:

Given below are two statements:
Statement I : Aniline is less basic than acetamide.
Statement II : In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton.
Choose the most appropriate option:

Staggered and eclipsed conformers of ethane are:

Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction:
$$CH_4 + I_2 \underset{\text{Reversible}}{\overset{h\nu}{\rightleftharpoons}} CH_3 - I + HI$$

Which one of the following statements is NOT correct?

The parameters of the unit cell of a substance are a = 2.5, b = 3.0, c = 4.0, $$\alpha$$ = 90°, $$\beta$$ = 120°, $$\gamma$$ = 90°. The crystal system of the substance is: