Question # 1

Fluorine does not show variable oxidation state because of.

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its high electronegativity

Its small sixe

low dissociation energy of F-F bond

Non availability of d-orbitals

Which of the following statements do not represent Lewis idea of acids and base?

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Compounds which have completely filled orbitals

Compounds which have incompletely filled orbitals

Compounds in which the central atom can expand its octel

All simple metal ions like Ag+, Al3+ etc.

The soap and detergent are source of organic pollutants like.

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Glycerol

Polyphosphates

Sulphonated hydrocarbons

All of these

Pick out the incorrect statement for transition metals.

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Cu+ is not a transition metal ion

Transition metals do not exhibit variable oxidation states

Transition metal ions are coloured

Transition metals and majority of their compounds are paramagnetic

Which of the following statement is not related to collision theory.

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Molecules must collide with each other to do a chemical reaction

Molecules must posses a minimum amount of energy

Molecules must have proper orientation

Collision theory is applicable to liquid only.

Vitamin which contains cobalt is.

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Vitamin B1

Vitamin B2

Vitamin B6

Vitamin B12

The electronic configuration of some elements are given below. The element with highest electron affinity is

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1s2, 2s2, 2p3

1s2, 2s2, 2p4

1s2, 2s2, 2p5

1s2, 2s2, 2p6

The number of significant figures in the number 0.216 is

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1

2

3

4

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

Which of the following statement represent advantages of sanitary Landfill

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Economical method

Low initial investment

Flexible daily capacity

All above

What letter suffix steel identification means that it is steel with boron as an alloying elements.

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xxL xx

xxBxx

xxHxx

xxKxx

Which of the following compounds shows optical activity

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Lactic acid

Maltose

Glucose

All above

Metallic magnesium is obtained by

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Reduction of MgO with Coke

Electrolysis of an aqueous solution of MgCl2

Electrolysis of molten MgCl2

Displacement of magnesium by iron form MgCl2 solution.

Which of the following carbonates decomposes at the highest temperature.

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Mg CO3

CaCO3

Sr CO3

Ba CO3

Fats and oil are_____________

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Acids

Alcohols

Salts

Base

What is the minimum tensile strength of gray Cast Iron class 50

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25000 ibf /in²

50000 ibf/in²

100000 ibf/in²

900000 ib/in²

What is the most common alloying ingredient in copper?

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Brass

Zinc

Cobalt

Nickle

When the concentration of reactant molecules is increased the rate of reaction increases. The best explanation is As the reactant concentration increases.

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The average kinetic energy of molecules increases.

The frequency of molecular collisions increases

The rate constant increase

The activation energy increases

Finely divided iorn combines with CO to give

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Fe(CO)3

Fe2 (CO)9

F33(CO)12

Fe(CO)6

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

A mixture containing S2- and SO4 ions on trating with dil HCl will produce

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H2S gas

SO2 gas

H2S and SO2 gas

CO

Complexing reactions are useful for which of the following method of analysis

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Gravimetry

Spectrophotometry

Interfering ions masking

All of the above

Enfleurage process is ued to extract the essential oils from

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Bark of plant

Seeds of plant

Leaves of plant

Flowers of plant

The maximum number of electrons in s,p,d and f sub shells are.

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2 in each

2, 6, 10, 18

2,6 ,10,14

5 in each

The light source in AAS used is

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UV light

Visible light

Radio waved

Hollow cathode lamp

Among the elements of second period the element with highest melting point belongs to group.

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1

14

17

18

Which can be purified by sublimation

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F2

Cl2

Be2

I2

In Ostwald's process of manufacturing nitric acid a mixture of ammonia gas with air is mantained with ratio.

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1 : 4

1 :3

1: 8

1 : 10

In sodium chloride type lattice, the ratio of coordination number of cation to anion is.

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6:6

7:7

4:8

4:4

The compound contains two types of X and Y its crystal structure is a cubic lattice with X-atoms at the corners of the unit cells and Y-atom t the body centre, The simplest formulae of this compound is.

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X2Y

XY

XY2

X8Y

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