IIT-JEE 2008 Paper 1 Offline | p-Block Elements Question 57 | Chemistry

IIT-JEE 2008 Paper 1 Offline

MCQ (Single Correct Answer)

-0

There are some deposits of nitrates and phosphates in earth's crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. Hybridisation easily explains the ease of sigma donation capability of NH$$_3$$ and PH$$_3$$. Phosphine is a flammable gas and is prepared from white phosphorus.

White phosphorus on reaction with NaOH gives PH$$_3$$ as one of the products. This is a:

dimerisation reaction

disproportionation reaction

condensation reaction

precipitation reaction

IIT-JEE 2007 Paper 2 Offline

MCQ (Single Correct Answer)

-1

This question contains STATEMENT-1 (Assertion) and STATEMENT-2 (Reason) and has 4 choices (a), (b), (c), (d) out of which ONLY ONE is correct.

STATEMENT-1 : Band gap in germanium is small. because

STATEMENT-2 : The energy gap of each germanium atomic energy level is infinitesimally small.

Statement - 1 is True, Statement - 2 is True; Statement - 2 is a correct explanation for Statement - 1

Statement - 1 is True, Statement - 2 is True; Statement - 2 is not a correct explanation for Statement - 1

Statement - 1 is True, Statement - 2 is False

Statement - 1 is False, Statement - 2 is True

IIT-JEE 2002 Screening

MCQ (Single Correct Answer)

-0.5

Specify the coordination geometry around and hybridisation of N and B atoms in a 1 : 1 complex of BF₃ and NH₃

N : tetrahedral, sp³; B : tetrahedral, sp³

N : pyramidal, sp³; B : pyramidal, sp³

N : pyramidal, sp³; B : planar, sp²

N : pyramidal, sp³; B : tetrahedral, sp³

IIT-JEE 1999

MCQ (Single Correct Answer)

-0.5

The oxidation number of sulphur in S₈,S₂F₂,H₂S respectively, are

0, +1 and -2

+2, +1 and -2

0, +1 and +2

-2, +1 and -2

JEE Advanced Subjects