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NEET NEET Questions — Free MCQ Practice

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0.1 mole of $H_{3} {PO}_{x}$ is completely neutralised by 5.6 g KOH then thr true statement is :

A.

x = 3 and given acid is dibasic

B.

x = 4 and given acid has not P-H linkage

C.

x = 2 and given acid does not form acid salt

D.

all of these

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Explanation

As in H3PO4 there are 3OH attatched to P(and one O double bonded with P) and the three OH donates 3H+ (it acts as an acid here) which is nutralised by 3 OH- supplied by KOH. Hence, it will be 4. are ionizable

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When potassium permangante is titrated against ferrous ammonium sulphate in acidic medium, the equivalent weight of potassium permanganate is :

A.

$\frac{molecular weight}{3}$

B.

$\frac{molecular weight}{5}$

C.

$\frac{molecular weight}{2}$

D.

$\frac{molecular weight}{10}$

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Explanation

2.

2KMnO₄+ 10FeSO₄(NH₄)₂SO₄.6H₂O+8H₂O → K₂SO₄+ 2MnSO₄+ 5Fe₂(SO₄)₃+ 10(NH₄)₂SO₄+ 68H₂O

The ionic equation involved in the process is given below.

Oxidation half reaction – [Fe²⁺ → Fe³⁺– e^–] x 5

Reduction half reaction – MnO₄^– + 8H⁺ + 5e^– → Mn²⁺ + 4H₂O

Overall ionic equation – MnO₄^–+ 8H⁺ + 5Fe²⁺ → Mn²⁺ + 5Fe³⁺ + 4H₂O

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In the preparation of hydrogenated oil the chemical reaction involving hydrogen is called:

A.

hydrogenation

B.

reduction

C.

dehydration

D.

oxidation

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Explanation

(a)

Necessity for Hydrogenation • Hydrogenated fat is basically a substitute to butter fats. • High costs of butter fat and its poor storage stability were detrimental factors that led to the investigation of alternative sources of hard fats. • This investigation led to the invention of catalyzed H2 addition across unsaturated sites of oils and fats and was quickly commercialized. • Conversion of liquid oils to solid and semi-solid fats having wide spectrum of physical & chemical characteristics of products were thus obtained.
What is Hydrogenation? • Hydrogenation is a process that reduces unsaturated fatty acid content of triglycerides by attaching hydrogen atoms at the point of unsaturation in the presence of catalyst, usually Nickel. • Hydrogenation accomplishes two things-: • 1.It increases the melting point of the oil or fat. • 2.Resistance to oxidation and flavor deterioration. • Hydrogenation process depends on several parameters: • Pressure, Temperature, Type of catalyst, Speed of agitation etc.
MECHANISM • The mechanism involved in fat hydrogenation is believed to be the reaction between unsaturated liquid oil and atomic hydrogen adsorbed on a metal catalyst. • It is similar to hydrogenation of alkenes.

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The most abundant isotope of hydrogen is:

A.

tritium

B.

deuterium

C.

protium

D.

para-hydrogen

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Explanation

(c) Protium is ₁H¹.

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Hydrogen is evolved by the action of cold dilute HNO₃ on:

A.

Fe

B.

Mg or Mn

C.

Cu

D.

Al

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Explanation

(b) Only Mg and Mn react with cold dil. HNO₃ to give H₂.

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A molten ionic hydride on electrolysis gives:

A.

H⁺ ion moving towards the cathode

B.

H⁺ ion moving towards the anode

C.

H₂ is liberated at anode

D.

H₂ is liberated at cathode

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Explanation

(c) Ionic hydride has H^- ion.

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Which statement is not correct for hydrogen peroxide ?

A.

Pure H₂O₂ is fairly stable

B.

It sometimes acts as a reducing agent

C.

It acts as an oxidising agent

D.

Aqueous solution of H₂O₂ is weakly basic

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Explanation

(d) H₂O₂ is weak di-basic acid

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In solid hydrogen, the intermolecular bonding is:

A.

ionic

B.

van der Waals'

C.

metallic

D.

covalent

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Explanation

(b) Covalent molecules occupy solid structure due to increasing van der Waals' forces.

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The lightest gas is :

A.

nitrogen

B.

helium

C.

oxygen

D.

hydrogen

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Explanation

(d) H₂ has lowest molecular weight.

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The critical temperature of water is higher than that of O₂ because H₂O molecule has:

A.

fewer electrons than oxygen

B.

two covalent bonds

C.

V-shape

D.

dipole moment

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Explanation

(d) Dipole-dipole attraction give rise to more tendency for aggregation.

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