Question # 1

In exothermic reaction decrease in potential energy of the products will result in

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Decreases in kinetic energy of the particles

Increases in kinetic energy of the particles

No change in kinetic energy

Decreases in activation energy

Which of the following is a tetrabasic acid?

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ORthophosphoric acid

Hyposphosphorus acid

Metaphosphoric

Pyrophosphoric acid

Borax is hydrated:

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Penta

Deca

Hepta

Octa

The nature of positive ray depend on:

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The nature of electrode.

The nature of discharge tube.

The nature of residual gas.

All of above.

Which of the following has more unpaired d-electrons?

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Zn⁺

Fe²⁺

Ni³⁺

Cu⁺

Pick up the correct statement

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CO which is major pollutant resulting from the combustion of fuels in automobile plays a major role in photochemical smog

Classical smog has an oxidizing character while the phtochemical smog is reducing in character

Photochemical smog occurs in day time whereas the classical smog occurs in early morning hours

During formation of smog the level of ozone in the atmosphere goes down

β-β- dichloroethyle sulphide is commonly known as:

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Mustared gas

Laughing gas

Phosgene gas

Bio gas

The branch of science dealing with structure, composition and changes in matter and laws and principles which govern these changes is called as

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chesmistry

Geology

Physics

Mechanics

Addition of solid NaHCO₃in water causes ionization of NaCHO₃its K_a= 4.7 x 10^-1. Then this solution has character

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Acidic

Very weakly basic

Alkaline

Neutral

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Forward reaction is favoured

Backward reaction is favoured

No effect

None of the above

Which has highest 1st I.E.

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Br

Cl

F

l

Hydrocarbons contain :

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Carbon only carbon

Hydrogen only

Carbon & hydrogen

Carbon , hydrogen & halogen

Potassium ferrocyanide is a

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Mixed salt

Double salt

Complex salt

Normal salt

The substance which is present in large quantity is called a :

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Solute

Solvent

solutiion

None of Above

Which of the following is a polar molecules

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Carbon dioxide

Carbon tetrachloride

Methanol

Ethane

A beaker contains 9 grams of water. The number of H-atoms is

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6.02 x 1023

3.01 x 1023

6.02 x 1024

3.01 x 1024

95% ethanol is called:

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Rectified other

Diesel

Rectified spirit

Petrol

Which is the transition element among the following

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B

Al

Cu

Cs

High purity copper metal is obtained by

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Carbon reduction

Hydrogen reduction

Electrolytic reduction

Thermite reduction

Any substance under going physical or chemical change is said to be

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Surrounding

System

Losphere

Lithosphere

A compound of the formula C₄H₁₀O_{reacts with sodium and undergoes oxidation to give a carbonyl compound which does not reduce Tollen's reagent, the original compound is}

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Diethyl ether

n-Butyl alcohol

Isobutyl alcohol

sec-Butyl alcohol

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Measuring pH

Measuring density

Titration against standard NaOH

Titration against standard KMnO₄solution

Acetic acid is obtained when

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Methyl alcohol is oxidized with potassium permanganate

Calcium acetate is distilled in the presence of calcium formate

Acetaldehyde is oxidized with potassium dichromate and sulphuric acid

Glycerol is heated with sulphuric acid

When phenol is reduced in the presence of Zn dust, we get

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Cyclohexene

Cyclohexane

Benzene

Benzyne

Sodium hexametaphophate is known as

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Calgon

Permutite

Natalite

Nitrolim

Which set of hybrid orbitals has planar triangle shape?

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sp³

sp

sp²

dsp²

The IUPAC name fo CH₃COCH (CH₃)₂is

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4-Methylisopropyl ketone

3-Methyl-2 butanone

Isopropylmethyl ketone

2 - Methyl- 2 butanone

Glutamic acid, aspartic acid are ______ amino acid

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Acidic

Basic

Neutral

None of these

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Increase in concentration of 1

Decrease in concentration of I₂

Increase in temperature

Increase in total pressure

10% aqueous solution of NaCI has molarity

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1.7 M

2.7 M

0.17 M

3.7 M

Corrosion of iron can be prevented by coating the surface with

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Zn

Sn

Ni

Any of the above

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