Question # 1

Potassium crystallizes in a body centered lattice. Hence, the coordination number of potassium in potassium metal is.

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4

6

8

12

Which type of polymers the Vulcanised rubbers is.

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Linear

Cross jinked

Branch chain

Any one of these

Which of the following statement is not correct regarding the constant R . and in ideal gas equation PV= nRT

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Its value in independent of temperature

Its value is independent of pressure

In SI Units its value is 8.314 K^-1 mol^-1

It is called the universal gas constant per molecule.

The electronic configuration of chromium is 4s1, 3d5, The elements tungsten (W) belongs to the same group and has atomic number 74.The configuration of its valence shell is.

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5s1, 4d5

6s1, 5d5

6s1, 5d6

6s1, 5d4

Used in TV sets and sound movies to give ready response to electrical potential

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He

Ne

Ar

Kr

Stainless steel consists of which elements.

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Fe only

Cr only

Fe and Ni

Fe ,Ni and Cr

Pick out the incorrect statement.

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Red phosphorus consists of a complied chain structure and black phosphorus has a layer structure.

Nitrogen shows a little tendency for catenation, because N-N a single bond is very strong.

The xamimum number of covalent bonds formed by nitrogen is four, since it has no d-orbitals in its valence shell

The group 15 elements do not form M5+ ions, but +5 oxidatin state is realized only through covalent bonding.

The oxidation Number of I in HIO4 is.

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+6

+ 7

+ 3

+ 14

Dyes used in photographic plates to make them panchromatic is.

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Cyanine dyes

Azine dyes

Phthalocyanine dyes

Acridine dyes

Ozone depletion in stratosphere will result in

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Forest fires

Increased incidence of skin cancer

Global warming

None of the above

The most suitable method of separation in mixture of o-and p- nitrophenol is.

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Steam distillation

Chromatography

Ion-exchange

Sublimation

Fish die in water bodies polluted by sewage due to.

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Pathogens

Clogging of gills by silt

Reduction in dissolved oxygen

Foul smell

AI Cl3 acts as a strong Lewis acid, because it is.

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A covalent compound

Readily hydrolyzed

Electron deficient

An ionic compound

Which of the following has the highest lattice energy

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LiCl

NaCl

KCl

CaCl

Which configuration has lowest potential energy.

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Eclipsed

Staggered

Skew

All have same energy

The number of optically active compounds in the isomers of C3H5Br3 is.

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1

2

3

4

iodine is used as

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Tincture of iodine

Iodex and antiseptic

Treatment of goiter

All above

Cobalt salt imparts which colour to the borax bead

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Blue

Green

Red

Yellow

The process of identifying the component present in a sample is called.

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Quantitative analysis

Qualitative analysis

Volumetric analysis

Gravimetric analysis

Sea water is converted into fresh water bases upon the phenomenon of.

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Plasmolysis

Sedimentation

Diffusion

Osmosis

Reverse osmosis

Which of the following is not true of ozone.

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It is a strong electilizing agent

It attacks organic compounds containing carbon carbon double bond

Its molecular is linear and has two different O-O bond lengths

It is more powerful oxidising agent at molecular oxygen

Which of the following is not a true characteristics of a catalytic reaction.

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The amount and chemical composition of the catalyst remains unchanged after the reaction

The catalyst does not intiate a chemical reaction

The reaction in which product also act as catalysis are called autocratically reactions.

The catalyst shifts the equilibrium position of a reaction in a favorable direction

Phosphorus has the oxidation state of +3 in

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Orthophosphoric acid

Hypophosphoric acid

Metaphosphoric acid

Orthophosphorus acid

Which of the following alloys contains Cu and Zn

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Bronze

Brass

Gun metal

Type metal

Which of the following statement is not true with respect to the role of matter undergoing decomposition.

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Decomposed matter increase soil fertility

They provide a texture which is favorable for plant growth

Organic compounds for complexes with mineral nutrients which enhance uptake by plants.

In high concentration the decomposition product may increase the photosynthesis

The correct order of electron affinities is.

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C > Si, > Na > Ar

Si > Cl > Na > Ar

C > Na > Si > Ar

C > Si > Ar > Na

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

Which show maximum number of oxidation states in 3d series.

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Mn

Ni

Co

Zn

Which of the following techniques is capable of seperating minute quantities of the substances in a relatively short times with high resolutions.

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Gel electrophoresis

Capillary electrophoresis

GC

HPLC

Which of the following statement is not true with respect to hydrocarbons.

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They are gaseous and liquids

They can be saturated or unsaturated

They in air by themselves alone cause harmful effects

They form photochemical oxidants

The special chrome steels of the stainless variety contain how many percent of chromium.

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4 to 8

11 to 17

9 tp 10

12 to 15

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