1
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Boric acid is solid, whereas $\mathrm{BF}_3$ is gas at room temperature because of
A
Strong van der Waal's interaction in Boric acid
B
Strong covalent bond in $\mathrm{BF}_{3}$
C
Strong hydrogen bond in Boric acid
D
Strong ionic bond in Boric acid
2
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The set of correct statements is :

(i) Manganese exhibits +7 oxidation state in its oxide.

(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.

(iii) Sc shows +4 oxidation state which is oxidizing in nature.

(iv) Cr shows oxidising nature in +6 oxidation state.

A
(ii), (iii) and (iv)
B
(ii) and (iii)
C
(i) and (iii)
D
(i), (ii) and (iv)
3
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

During the borax bead test with $$\mathrm{CuSO_4}$$, a blue green colour of the bead was observed in oxidising flame due to the formation of

A
CuO
B
Cu(BO$$_2)_2$$
C
Cu$$_3$$B$$_2$$
D
Cu
4
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1

"A" obtained by Ostwald's method involving air oxidation of NH$$_3$$, upon further air oxidation produces "B", "B" on hydration forms an oxoacid of Nitrogen along with evolution of "A". The oxoacid also produces "A" and gives positive brown ring test.

Identify A and B, respectively.

A
$$\mathrm{N_2O_3,NO_2}$$
B
$$\mathrm{NO_2,N_2O_5}$$
C
$$\mathrm{NO_2,N_2O_4}$$
D
$$\mathrm{NO,NO_2}$$
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