JEE Main PYQs — p-Block Elements (Class 11)

The number of neutrons present in the more abundant isotope of boron is 'x'. Amorphous boron upon heating with air forms a product, in which the oxidation state of boron is 'y'. The value of x + y is…

Consider the oxides of group 14 elements SiO2, GeO2, SnO2, PbO2, CO and GeO. The amphoteric oxides are

The number of ions from the following that are expected to behave as oxidising agent is: Sn4+,\ Sn2+,\ Pb2+,\ Tl3+,\ Pb4+,\ Tl+

For a good quality cement, the ratio of silica to alumina is found to be

Given below are two statements: Statement I: Boron is extremely hard indicating its high lattice energy. Statement II: Boron has highest melting and boiling point compared to its other group members.…

Better method for preparation ofBeF2, among the following is

During the borax bead test with CuSO4, a blue green colour of the bead was observed in oxidising flame due to the formation of

Boric acid is solid, whereas BF3 is gas at room temperature because of

The correct order of bond enthalpy (kJ\,mol-1) is:

The Lewis acid character of boron trihalides follows the order:

When borax is heated with CoO on a platinum loop, blue coloured bead formed is largely due to

The geometry around boron in the product 'B' formed from the following reaction isBF3 + NaH 450\,K A + NaF A + NMe3 B

Aqueous solution of which of the following boron compounds will be strongly basic in nature?

Choose the correct stability order of group 13 elements in their +1 oxidation state.

Borazine, also known as inorganic benzene, can be prepared by the reaction of 3-equivalents of "X" with 6 equivalents of "Y". "X" and "Y", respectively are

The number of bridged oxygen atoms present in compound B formed from the following reactions is {Pb(NO_3)_2 {673\,K} A + PbO + O_2 A {Dimerise} B}

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?

Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y, forms Z. X, Y and Z respectively are

The incorrect statement about B2H6 is:

The INCORRECT statement regarding the structure of C60 is:

Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is:

Which one of the following compounds of Group-14 elements is not known?

'X' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. X is:

On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with NO changes to a blue solid (C). The oxidation number of…

The reaction of H3N3B3Cl3 (A) with LiBH4 in tetrahydrofuran gives inorganic benzene (B). Further, the reaction of (A) with (C) leads to H3N3B3(Me)3. Compounds (B) and (C) respectively, are:

On heating compound (A) gives a gas (B) which is constituent of air. This gas when treated with H2 in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be:

The relative stability of +1 oxidation state of group 13 elements follows the order

The correct order of catenation is:

The C–C bond length is maximum in:

C60, an allotrope of carbon contains

The amorphous form of silica is:

The hydride that is NOT electron deficient is:

The number of 2-centre-2-electron and 3-centre-2-electron bonds in B2H6, respectively, are:

Diborane (B2H6) reacts independently with O2 and H2O to produce, respectively:

The number of pentagons in C60 and trigons (triangles) in white phosphorus, are:

The basic structural unit of feldspar, zeolites, mica, and asbestos is:

Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and +3 oxidation states. This is due to:

The element that does not show catenation is: