NEET Questions - Chemistry - P

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Boron form covalent Compound due to

Higher ionisation enthalpy
Lower ionisation enthalpy
Small size
Both (1) and (3)

In diborane the Two H-B-H angles are nearly

$ 60 ^ \circ , 120 ^\circ $
$ 95 ^ \circ , 120 ^\circ $
$ 95 ^ \circ , 150 ^\circ $
$ 120 ^ \circ , 180 ^\circ $

The stability of +1 oxidation state increases in the sequence

Al<Ga<In<Tl
Tl<In<Ga<Al
In<Tl<Ga<Al
Ga<In<Al<Tl

Cohen Orthoboric acid $ (H_3BO_3) $ is strongly heated, the residue is

Meta boric acid
Boron
$ Al_2O_3, 2H_2O $
None of above

Bauxite has the composition

$ Al_2O_3 $
$ Al_2 O_2, H_2 O $
$ Al_2 O_3 . 2 H_2O$
none of the above

Which one of the following is correct statement

The hydroxide of aluminium is more acidic than that of boron
The hydroxide of boron is basic, while that of aluminium is amphoteric
The hydroxide of boron is acidic, while that of aluminium is amphoteric
The hydroxide of boron & aluminium are amphoteric

$ AlCl_3 $ is

Anhydrous & covalent
Anhydrous & ionic
covalent & basic
coordinate & acidic

Aluminium has a great affinity for oxygen & it’s oxidation is an exothermic process. This fact is used in

Preparing thin foils of aluminium
Making utensils
Preparing duralumin alloy
Thermite welding

Which of the following is an amphoteric oxide.

$ MgO $
$ Al_2 O_3 $
$ Cl_2 O_7 $
$ Ti_2 O_2 $

When Al is added to KOH solution

No action takes place
Oxygen is evolved
Water is produced
Hydrogen is evolved

Aluminium is more reactive than iron. But Aluminium is less easily corroded than iron because

Aluminium is noble metal
Oxygen forms a protective oxide layer
Iron undergoes reaction easily with water
Iron forms mono and divalent ions

Aluminium vessels should not be washed with materials containing washing soda since

Washing soda is expensive
Washing soda is easily decomposed
Washing soda reacts with aluminium to form soluble aluminate
Washing soda reats with aluminium to form insoluble aluminium oxide

Which of the statements about anhydrous aluminium chloride is correct

It exists as $ AlCl_3 $ molecule
It is not easily hydrolysed
It sublimes at $ 100^\circ $ C under vaccum
It is a strong lewis base

The liquid field metal expanding on solidification is

Ga
Al
Zn
Ca

Anhydrous $ AlCl_3 $ cannot be obtained from which of the following reactions

$ Heating AlCl_3 .6H_2O $
By Passing dry HCl over hot aluminium powder
$ By Passing dry Cl_2 over hot aluminium powder $
$ By passing dry Cl_2 over a hot mixture of alumina and coke $

NEET Chemistry Questions: P - Block Elements