Question # 1

Hydrogen and Helium follow.

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Octet rule

Triple rule

Duplet rule

None of these

Which ionic compound has the highest melting point.

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RbCl

KCl

LiCl

NaCl

Group nuebr tells about the

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Number of shells

Number of valence electrons

Both a and b

None of these

At what temperature , rate of ammonia formation and decomposition is the highest.

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200 ^oC

300^oC

400 ^oC

500 ^oC

In which period and group yu will place the elemnt whic is an important part of the solar cell?

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Third period and Sixth a grop Group 16

Third priod and forth A group Group 14

Second period and forth A group Group

Third prod and fifth A group Group 15

Sodium metal has electrons

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10

11

12

14

How is radio carbon dating useful for archeolgists.

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It helps detemine whether the matter is radioactie or not

It helps determine the age of organic matter

It helps determine the composition of matter

It helps deterime the usefulness of matter

Whcih one of the following is the weakest force among the atoms.

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Intermolecular force

Ionic force

Metallic force

Covelent forces

How many groups are present in the modern periodic table.

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8

10

15

18

Following are state of matter.

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Liquid

Solid

Gas

All of these

The new substance formed in a chemcial reaction is.

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Reverse

Reactant

Forward

Product

Acute lead poisoning causes dysfunction of.

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Kidney

Liver

CNS

All of them

In shoe polished, which chemical is used.

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Ethanol

Methanol

Carbon black

Formaldehyde

The percentage of water in human body is about:

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60%

50%

70%

80%

Which disease is caused by polluted water.

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Cholera

Typhoid

Diarrhea

All of them

Sodium carbonate is manufactured by.

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Haber's process

Ostwald's process

Solvay's process

All

If a liquid has a pH of 7 then it must.

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Be a colourless and odourless liquid

Freeze at 0 ^oC and boil at 100 ^oC

Be natural

Be a solution containing water

A salt always

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Contain ions

Contains water of crystallization

Dissolves in water

Forms crystals which conduct electricity

A sea level the boiling point of water is.

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0^oC

98^oC

100^oC

110^oC

The unit of molar concentration:

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mol. dm^-2

mol. dm^-1

mol. dm

mol. dm^-3

When the magnitude of Kc is very small in indicates.

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Equilibrium will never establish

All reactants will converted to products.

Reaction will go to completion

The amount of products is negligible

When a reaction ceases to proceed further , it is called.

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Chemical states

Static state

Physical state

Dynamic equilibrium state

Dipole moment of CO2 is.

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1.25 D

1.85 D

3.1 D

Zero

The mathematical relation between the rate of reaction and the concentrations of the reactants is known as the

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Rate equation

Rate law

Arrhenius equation

Both a and b

How many balloon of 0.25 dm3 capacity at 1 atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm3 capacity at 10 atmospheric pressure.

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50

90

180

200

Azeotropic mixture

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Obey Raoult's law

Do not obey Raoult's law

Boils at low temperature only

Boils at high temperature only

The power of which the concentration of a substance appears in the rate expression is known as

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order of reaction with respect to that substance

Rate of reaction

Order of reaction

Molecularity of reaction

Which of the following wave properties is inversely proportional to the energy for electromagnetic radiations

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Frequency

Wave number

Velocity

Wave length

The standard heat of formation is measured at 1 atmosphere and

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0 ^oC

100 ^oC

293 ^oC

25 ^oC

Which one of the following substances is not used as drying agent in desiccators.

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Calcium chloride

Phosphorus pentoxide

Silica gel

50% NaCl

When small amount of acid or base is added to buffer, its pH.

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Remain same

Always increases

Always decreases

slightly increases or decreases

Orbitals having same energy are called

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Hybird orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

Splitting of spectral lines when atoms are subjected to magnetic field is called.

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Stark effect

Zeeman effect

Photoelectric effect

Compton effect

Which of the following is a typical transition metal.

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Sc

Y

Ra

CO

A solution of borax in water is.

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Acidic

Alkaline

Neutral

None of these

Which one of halogens is a liquid

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F₂

Cl₂

Br₂

I₂

Group VI-B of transition elements contains

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Zn, Cd, Hg

Fe, Ru, Os

Cr, Mo, W

Mn, Te, Re

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

Which one of the following is not amino acid.

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Alanine

Glycine

Aspartic acid

Aniline

Which of the following sulphates is not soluble in water.

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Sodium sulphate

Potassium sulphate

Zinc sulphate

Barium Sulphate

Which gas act as 'Blistering agent'

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Acetylene

Phosphine

Phosgene

Mustard gas

Usually the percentage of moisture is paper is

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1- 3%

4-6%

6-8%

5%

Which one of the following species is meta director if present at benzene ring.

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-NO2

-Cl

-CH3

-OH

Which one of the following species is a nucleophile

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CH3

(CH3)2 C

BF3

OH-