Question # 1

Which of the following iso electronic spices has the highest IE.

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Ne

Na+

F

O2-

Black and white photographic film contain small grains of.

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Silver bromide

Silver cholride

Silver iodide

Any of above

The equivalent conductance of a 1 N solution of an electrolyte is nearly

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The same as its specific conductance

10³ times more than its specific conductance

10-3 times its specific conductance

100 times its specific conductance.

The H2SO4 obtained by the contact process having purity

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70%

74%

78%

82%

Which of the following is not a property of Ni.

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it is a soft silvery white metal

It is malleable and ductile

It is highly magnetic

It has high electrical and thermal conductivities

Which of the following elements is most electropositive.

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C

N

O

Be

The attraction which exists between carbon dioxide molecules in solid carbon dioxide is due to.

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Van der Waal's forces

Molecule ion forces

ionic bonds

hydrogen bonds

The electrophile in the sulphonation of benzene is.

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SO3

SO3H

HSO4

SO2

During the preparation of ethane by Kolbe's electrolytic method using inert electrodes the pH of the electrolyte.

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Increases progressively as the reaction proceeds

Decreases progressively as the reaction proceeds

Remains constant throughout the reaction

May decrease if the concentration of the electrolyte is not very high

Consider the coordination compound Na2[Pt(CN)4] the Lewis and is

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[Pr(CN)4]2

Na+

Pt

Pt2+

Which of the following statement is false about resonance.

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It increase the stability of a molecule

It leads to similar type of bonds

It increase the reactivity of the molecule

It decrease the reactivity of the molecule.

What refer to the casehardening process by which the carbon content of the steel ear the surface of a part is increased?

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Carburizing

Annealing

Normalizing

None of these

The correct order of thermal stabilities of hydriedes of group 15 is.

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NH3 > PH3 > AsH3 > BiH3> SbH3

NH3 > PH3 >AsH3 > SbH3> BiH3

NH3 < PH3 < SbH3 > AsH3 > BiH3

BiH3 > Sb H3 > AsH3 > PH3 > NH3

Xenan hexaflouride at 47.7 ^oC is

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Colorless solid

yellow solid

Yellow liquid

Colorless liquid

Ozone layer of upper atmosphere is being destroyed by

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chlorofluorocarbons

SO2

Photochemical oxidants O2 and CO2

Smog

Which of the following is not a biodegradable polymer.

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Protein

PVC

Cellulose

Nucleic acid

The force responsible for dissolution of ionic compounds in water are

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Hydrogen bonds

Ion dipole forces

Ionic bonds

Van Der Waal forces

Un-like s -block elements d-block elements form which compounds as well

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ionic compounds

Co valent compound

Co ordinate compounds

None of above

Which of the following is the most stable towards heat.

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CaCO3

BaCO3

Na2CO3

MgCO3

Which of the following hydroxide is amphoteric.

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B(OH)3

Al(OH)3

Ga (OH)3

In (OH)3

The number of degree freedom at the triple point for the water system in.

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One

Two

Three

Zero

The inert gasses AR, Ka, and Xe form solid compounds with certain organic molecules under pressure..

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Halides

Hydrates

Clathrates

All of above

Which of the following mixture is used as most popular flame in AAS.

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Acetylene air

Acetylene O2

Hydrogen air

Hydrogen O2

Which of the following species have undistributed octahedral structure.

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SF6

PF6

Si F₆^2-

XeF6

Which of the following statements is not correct with respect to second law of thermodynamics.

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It helps in know the position of chemical equilibrium

It helps to know the position of chemical equilibrium

It determines the conversion of heat into work

It is based on Nerst heat theorem

Which one of the following oxides is basic.

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MnO

Mn2O3

MnO2

Mn2O7

The element with maximum first ionization energy is.

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B

N

O

C

Which of the following is an example of super octet molecules.

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C1F3

IF7

PCl5

All the three

Which of the following elements has the highest density.

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Mg

Na

K

Rb

Diamond and carbon are the _________ forms of carbon

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Isotropic

amorphous

Allotropic

Isomeric

Cytosine a pyrimidine base pairs with

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Guanine

Thymine

Adenine

Any of these

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