HARD
Earn 100

Group-13 elements react with O2 in amorphous form to form oxides of type M2O3 (M= element). Which among the following is the most basic oxide?

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Important Questions on The p-Block Elements

MEDIUM
The correct option pertaining to varying chemical behaviour of the first member of a group(s-and p- block elements) compared with the subsequent members of the same group is that they
(A) exhibit the maximum covalency of 4
(B) have less electronegativity
(C) possess large charge to radius ratio
MEDIUM
Sodium borohydride upon treatment with iodine produces a Lewis acid (X), which on heating with ammonia produces a cyclic compound Y and a colorless gas Z. X, Y and Z are
EASY
H3BO3 or B(OH)3 is considered as an acid because its molecule
MEDIUM
In the following reaction sequence, the compound C is
Al+N2ΔAH2OBppt+Cg
EASY
The molecule which is NOT hydrolysed by water at 25oC is
MEDIUM
Identity the incorrect statement in case of diborane structure
EASY

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: In TlI3, isomorphous to CsI3, the metal is present in +1 oxidation state.

Reason R: Tl metal has fourteen f electrons in its electronic configuration.

In the light of the above statements, choose the most appropriate answer from the options given below:

HARD

Identify the correct statements about the anomalous behaviour of Boron

I. Boron trihalides can form dimeric structures.

II. Boron shows +1 as stable oxidation state

III. Maximum covalency of Boron is four.

IV. Boron does not form BF66- ion.

MEDIUM
When metal M is treated with NaOH, a white gelatinous precipitate X is obtained, which is soluble in excess of NaOH. Compound X when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal M is
EASY
The correct statements among I to III regrading group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminum and gallium are amphoteric.
(III) Oxides of indium and thallium are basic.
MEDIUM
A metal X dissolves both in dilute HCl and dilute NaOH to liberate H2. Addition of NH4Cl and excess NH4OH to an HCl solution of X produces Y as a precipitate. Y is also produced by adding NH4Cl to the NaOH solution of X. The species X and Y, respectively, are
MEDIUM
The type of hybridization of Boron in diborane is _____
EASY
The highest E0 (in V) value for M+M among the group 13 elements is
MEDIUM

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Boron is unable to form BF63-

Reason R: Size of B is very small.

In the light of the above statements, choose the correct answer from the options given below

EASY
Product of reaction between Aluminium with aqueous NaOH
MEDIUM
When aluminium chloride is dissolved in water, it gives
HARD
Choose the correct stability order of group 13 elements in their +1 oxidation state.
MEDIUM
The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence: