Question # 1

The electropositive elements have the tendency to

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Lose electrons

Gain electrons

Share electrons

All of these

A covalent bond formed by two similar stoms is known as.

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Polar Covalent bond

Metallic bond

Double covalent bond

Non-polar covalent bond

Who use the word energy for the 1st time

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Rutherford

Bohr

Thomas Young

None of these

d- subshell can accommodate maximum electrons.

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2

6

10

14

Atoms achieve stability by attainign electonic configuration of.

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Alkali metals

Coinage metals

Inert Gases

Alkaline earth metals

An element has 5 electrons in M shell. Its tomic number is.

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5

10

15

20

A sub sheel that cna accommodate 6 electrons is

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b

s

f

p

Which is strongest oxidizing agent.

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Cholorine

Iodine

Fluorine

Bromine

When old bonds are broken, the energy is.

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Release

Remain same

Consume

None of these

Whcih term is the same for one mole of oxgen and one mole of water.

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atoms

mass

Molecules

Volume

In the beginning the rate of reverse reaction is.

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Slow

very fast

Moderate

Negligible

Which one is the formula of chloromethane.

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CH₂Cl₂

CCl₄

CHCl₃

CH₃Cl

Which one of the following is non- reducing in nature;

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glucose

fructose

starch

sucrose

Pitch is black residue of

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Coke

Coal-tar

Coal

Coal gas

Froth flotation process is used to concentrate the ore on:

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Density basis

Concentration basis

Wetting basis

Magnetic basis

In dry cleaning, which chemical is used.

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Chloroform

Carbon tetachloride

Ecetaldehyde

Ethanol

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

Carbon black is used in the manufacture of.

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Dry cleaning

Shoe polishes.

Fertilizer

None of these

Cholera is caused by

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Protozoa

Virus

Bacteria

Fungi

Which pollutant is responsible for changing weather?

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Air pollutant

Water pollutant

Soil pollutant

All of them

Methyl butanoate smells like;

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a pine apple

an apple

an orange

a lemon

Which one of the properties of water is responsible for rising of water plants?.

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Specific heat capacity

Surface tension

Excellent solvent action

Capillary action.

When a reaction occurs in many steps than the slowest step is.

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Mechanism step

Rate determining step

enthalpy determining step

None of the above

A filtration process could by very time consuming if it were into aided by a gentle suction which is developed.

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If the paper covers the funnel upto its circumference

If the paper has got small sized pores in it.

If the stem of the funnel is large so that it dips into the filtrate

If the paper fits tightly

Alkali and alkaline earth metal are usually obtained by

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Decomposition of their carbonates

By heating their hydroxide

electrolysis of molten metal oxides

Electrolysis of molten metal halides

The mass of one mole of electrons is.

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1.008 mg

0.55 mg

0.184 mg

1.673 mg

Which of the following molecules have highest bond energy

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F2

Cl2

Br2

I2

With increase in 10°C temperature, the rate of reaction double. This increase in rate of reaction is due to

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Decrease in activation energy of reaction

Decrease in the number of collisions between reactant molecules

Increases in activation energy of reactants

Increase in number of effect collisions

18 g glucose is dissolved in 90 g o water, The relative lowering of vapour pressure is equal to.

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1/5

5.1

1/51

6

The number of bonds in nitrogen molecules is.

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One pi and one sigma

One pi and two sigma

Thre sigma only

Two pi and one sigma

X- rays have same nature as

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Alpha rays

Beta rays

Gamma rays

Cathods rays

As compared to pure atomic orbitals the hybrid orbitals have.

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Low energy

High energy

Same energy

None of these

When HCl is added to H2S aqueous solution, Its ionization

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Decrease

Increase

Remains constant

First increases than decreases

The reactivity of Grignard's regent is due to

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Polarity of Mg-x bond

Polarity of C-Mg bond

Electro negativity of halogen atom

Presence of Mg-atom

Conversion of ammonium carbamate into urea is

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Hydrolysis

Hydrogenation

Hydration

Dehydration

The resonating contributing structures of Benzene are

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2

3

5

7

The product of fermentation of sucrose is

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Ethanol and H2O

Ethanol and CO

Ethanol and CO2

Glucose and CO2

Which one of the following is not an alkali metal.

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Francium

Cesium

Rubidium

Radium

Which can produce ketone

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Sec alcohol

Calcium acetate

Propyne

All of these

Which one of the following has lowest first ionization energy.

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Li

Na

Rb

Cs

When CO₂is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is

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propane

propanoic acid

propanal

propanol

Which three elements are needed for the healthy growth of plants.

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N,S,P

N, Ca, P

N,P,K

N,K,C

Which property of triglycerides is used to determine its molecular mass.

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acid number

Saponification number

Iodine number

gold number

Which of the following hydrogen halide is the weakest acid in solution.

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HF

HBr

HI

HCl