Question # 1

Which pair of elements will have the same type of bonds between their atoms in the solid state?

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carbon and calcium

lithium and boron

aluminium and phosphorus

nitrogen and carbon

Combustion analysis is performed for the determination of

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Molar mass of the compound

Empirical formula of the compound

Structural formula of the substance

Mass of halogens present in organic compounds

In order to determine ∆H (latt) of ionic compound which is correct relationship

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∆H latt. = ∆Hf - ∆Hx

∆H latt. = ∆Ha + ∆Hv

∆H latt. = ∆Hf + ∆Hx

∆H latt. = ∆Hf - ∆H sol.

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

The unit of pressure ______ is commonly used by meteorologists

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mm of Hg

Kilopascal

Millibar

Pound per square inch

The crystals formed due to London forces of interaction are

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ionic

covalent

molecular

metallic

Vegetable oils are

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Unsaturated fatty acids

Glycosides of unsaturated fatty acids

Glycosides of saturated fatty acids

None

The conversion of an halide of an alkene is an example:

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addition reaction

substitution reaction

elimination reaction

oxidation reaction

When the temperature is raised, the viscosity of the liquid decreases.This is because of

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Decreased volume of the solution

Increase in temperature increases the average kinetic energy of molecules which overcome the attractive force between them

Decreased covalent and hydrogen bond forces

Increased attraction between the moelcules

If the number of gas molecules are doubled in the certain volume the pressure is:

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Increased to four times

Remains unchanged

Doubeld

Decrease to half

Caseinogen is

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Simple protein

Derived protein

Phosphoprotein

Rich in sulfur containing amino acids

The spectrum of He is expected to be similar to that of

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H

Na

He⁺

Li⁺

Besides Zn and Cu , German silver contains the metal

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Sn

Ag

Ni

Mg

For a given process the heat change at constant pressure q_pis related to the heat change at constant volume (q_v) according to

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q_p= q_v

q_p< q_v

q_p> q_v

q_p= qv/2

The open chain compounds are also called

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Aliphatic

Alicylic

Aromatic

Both a and b

Which of the following is not fatty acid?

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Propanoic acid

Acetic acid

Phthalic acid

Butanoic acid

All the elements belongs to the 2nd period are

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Normal elements

Transition elements

Stable elements

Halogens

Ammonium nitrate fertilizer is not used for which crop

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Cotton

Wheat

Sugar cane

Paddy rice

Which of the following element is most reactive

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Li

Na

K

Cs

The osmotic pressure of 1 m solution at 27°C is

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2.46 atm

24.6 atm

1.21 atm

12.1 atm

A compound R has all of the following properties. It is neutral; It gives an orange precipitate with 2,4-dinitrophenythydrazine; it evolves hydrogen chloride when treated with PCI₅in the cold What could R be

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The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

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Hund's rule

Markowvikov's rule

Pauli's exclusion principle

Auf ban principle

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