NEET Chemistry Chapter Wise Mock Test – p-Block Elements

NEET Chemistry Chapter Wise Mock Test – p-Block Elements

Question 1:
H₃BO₃ is
(a) monobasic and weak Lewis acid
(b) monobasic and weak Bronsted acid
(c) monobasic and strong Lewis acid
(d) tribasic and weak Bronsted acid

Question 2:
In III A group, Tl (thallium,) shows +1 oxidation state while other members show +3 oxidation state, why?
(a) Presence of lone electron in Tl
(b) Inert pair effect
(c) Large ionic radius of Tl ion
(d) None of the above

Question 3:
The liquefied metal expanding on solidification is
(a) Ga
(b) Al
(c) Zn
(d) Cl

Question 4:

Question 5:

Question 6:
Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards to the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to
(a) an interaction with nitrogen of the air at very low temperatures
(b) a change in the partial pressure of oxygen in the air
(c) a change in the crystalline structure of tin
(d) an interaction with water vapour contained in the humid air

Question 7:
The order of acidic strength of boron trihalides
(a) BF₃ < BCI₃ < BBr₃ < Big
(b) Big < BBr3 < BCIg < BF3
(c) BCI₃ < BBr₃ < Big < BF₃
(d) BBr₃ < BCI₃ < BF₃ < Big

Question 8:

Question 9:
Which of the following is known as inorganic benzene?
(a) Borazine
(b) Phosphonitrilic acid
(c) Boron nitride
(d) p-dichlorobenzene

Question 10:

Question 11:
Which of the following cuts ultraviolet rays?
(a) Soda glass
(b) Crooke’s glass
(c) Pyrex glass
(d) None of these

Question 12:

Question 13:
Aluminium reacts with caustic soda to form
(a) aluminium hydroxide
(b) aluminium oxide
(c) sodium meta aluminate
(d) sodium tetra aluminate

Question 14:
Al₂0₃ can be converted to anhydrous AICI₃ by heating
(a) Al₂0₃ with HCI gas
(b) Al₂0₃ with NaCi in solid state
(c) a mixture of Al20₃ and carbon in dry Cl₂ gas
(d) Al₂0₃ with Cl₂ gas

Question 15:
Borax is used as cleansing because on dissolving in water it gives
(a) alkaline solution
(b) acidic solution
(c) bleaching solution
(d) colloidal solution

Question 16:
Which glass will not crack when temperature changes?
(a) Pyrex
(b) Boro silicate
(c) Calcium silicate
(d) Flint

Question 17:
Which of the following is the electron deficient molecule?
(a) B₂H₆
(b) C₂H₆
(c) PH₃
(d) SiH₄

Question 18:
Heating of an aqueous solution of aluminium chloride to dryness will give
(a) AI(OH)CI₂
(b) AI₂O₃
(c) AI₂CI₆
(d) AlCl₃

Question 19:

Question 20:
Which of the following reactions will not give the anhydrous AICI₃?
(a) By heating AICI₃.6H₂0
(b) By passing dry HCI gas on heated aluminium powder
(c) By passing dry chlorine gas on heated aluminium powder
(d) By passing dry chlorine gas over a heated mixture of alumina and coke

Question 21:
Formation of innumerable compounds of carbon is due to its
(a) high reactivity
(b) catenation tendency
(c) covalent and ionic tendency
(d) different valency

Question 22:
Carbon suboxide C₃0₂ has
(a) linear structure
(b) bent structure
(c) trigonal planar structure
(d) distorted tetrahedral structure

Question 23:
Which of the follpwing oxidation states are the most characteristics for lead and tin respectively?
(a) +4, +2
(b) +2, +4
(c) +4, +4
(d) +2, +2

Question 24:

Question 25:

Question 26:

Question 27:

Question 28:

Question 29:
Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that, graphite
(a) is a non-crystalline substance
(b) is an allotropic form of diamond
(c) has molecules of variable molecular masses like polymers
(d) has carbon atoms arranged in large plates of rings of strongly bound carbon atoms with weak interplate bonds

Question 30:
The lead of the lead pencils melts at
(a) 2000°C
(b) 350°C
(c) 3170°C
(d) 75°C

Question 31:

Question 32:

Question 33:

Question 34:

Question 35:
Which of the following is a three dimensional silicate?
(a) Mica
(b) Spodumene
(c) Zeolite
(d) None of these

Question 36:
When sand is heated with hydrofluoric acid and a wet rod is brought in contact with vapours evolving a white deposit is due to
(a) SiF₄
(b) SiF₂
(c) H₄Si0₄
(d) None of these

Question 37:

Question 38:
Supercritical C0₂ is used as
(a) dry ice
(b) firefighting
(c) a solvent for extraction of organic compounds from natural sources
(d) a highly inert medium for carrying out various reactions

Direction (Q. Nos. 39-40) In the following questions more than one of the answers given may be correct. Select the correct answer and mark it according to the codes.
Codes
(a) 1,2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 39:
Tetraethyl lead is a
1. poisonous compound present in petrol
2. antiknock compound
3. component of ethyl fluid
4. propellants

Question 40:

Question 41:

Question 42:

Question 43:
Assertion The ionisation energy of gallium remains nearly same as that of aluminium.
Reason This is due to shielding of outer shell electrons from the nucleus by the d-electrons of gallium.

Direction (Q. Nos. 43-44) Each of these questions contains two statements : Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a), (b), (c) and (d) given below.
(a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion .
(b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion
(c) Assertion is true, Reason is false
(d) Assertion is false, Reason is true

Question 44:
Assertion Silicones are hydrophobic in nature.
Reason Si — O — Si linkages are moisture sensitive.

Question 45:
Which of the following structure is similar to graphite?
(a) B
(b) B₄C
(C) B₂H₆
(d) BN

Question 46:

Question 47:
Which is the strongest acid in the following?
(a) HCIO₃
(b) HCI0₄
(c) H₂S0₃
(d) H₂S0₄

Question 48:
Which of the following is electron deficient?
(a) (SiH₃)₂
(b) (BH₃)₂
(c) PH₃
(d) (CH₃)₂

Question 49:
In silica (Si0₂), each silicon atom is bonded to
(a) two oxygen atoms
(b) four oxygen atoms
(c) one silicon and two oxygen atoms
(d) one silicon and four oxygen atoms

Question 50:
The formula of mineral borax is
(a) Na₂B₄0₇
(b) Na₂B₄0₇.4H₂O
(c) Na₂B₄0₇.5H₂0
(d) Na₂B₄O₇.10H₂O

Question 51:

Question 52:
Aluminium oxideimrot reduced by chemical reactions since
(a) reducing agent contaminate
(b) the process pollute the environment
(c) aluminium oxide is highly stable
(d) aluminium oxide is reactive

Question 53:

Question 54:
Graphite is a soft solid lubricant extremely difficult to melt. The reason for this anomalous behaviour is that graphite
(a) is an allotropic form of carbon
(b) is a non-crystalline substance
(c) has carbon atonts arranged in large plates of rings of strongly bonded carbon atoms with weak interplate bonds
(d) has molecules of variable molecular masses like polymers

Answers:

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