Question # 1

According to Rutherford's atomic theory, atom should produce.

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Line spectrum

Continuous spectrum

Both a and b

None of these

How many elements are present in each 4th and 5th period.

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2

8

32

18

While baking which gas is responsible for raising the bread and making it soft?

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Oxygen

Carbon monoxide

Carbon di oxide

Nitrogen

Empirical formula of acetic acid (CH3COOH) is

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CHO

CH

CH2O

None of these

1- gram atom of carbon contain hwo many moles.

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1 mole

2 mole

6 moles

12 moles

Caustic chemical drain cleaner are captable of dissolving.

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Hair

Food

Grease

All of these

4th and 5th priod of the long form of periodic table are called.

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Short periods

Normal periods

Very long peiods

Long periods

Pressure is a significant property of.

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Gas

Solid

Liquid

None of these

Which state of matter has fixed shape and volume?

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Liquid

Solid

Gas

All of these

Which group elements has low ionization energies.

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Halogens

Noble gases

Alkaline Earth Metals

Alkali Metals

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

Chalco-pyite is an ore of:

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iron

aluminium

silver

copper

Ethyne is oxidized by alkaline KMnO₄ then ....... hydroxyl group add to the triple bond.

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Two

Three

Four

Five

Red hair contains compound of.

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Iron

copper

titanium

Molybdenum

Which one of these is a saturated hydrocarbon?

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C₂H₄

C₃H₆

C₄H₈

C₅H₁₂

Which process is responsible for ascending of water in plants from roots to leaf?

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Condensatin

Transpiration

Capillary action

Evaporation

The value of K_c depends on.

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Temperature

Pressure

Volume

Atmosphere

About 99% atmosphere's lies within:

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30 kilometre

35 kilometre

15kilometre

11 kilometre

These are safe source of food and energy for body during emergency.

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Proteins

Vitamins

Carbohydrats

Lipids

Chemical formula of copper glance is:

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Cu2O

Cu2S

CuFeS2

CuSO4

Hydrogenation of alkenes and alkynes may be carried out at room temperature in the presence of catalyst:

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Pt or Pd

Ni

Zn

Fe2O3

Denaturing of protein is caused by.

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Heating

Changing pH

Both of them

None of these

The substance used for decolorization of crystalline substance is

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G2O5

Chloroform

Animal charcoal

Soda ash

Le-Chatelier Braun principle is sometimes known as

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Law of mass action

Law of mobile equilibrium

Law of active mass

All of these above

The number of H2O molecules in 9 grams of ice is

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3.01 x 10²³

6.02 x 10²³

6.02 x 10⁸

12.04 x 10²³

The wave number of the light emitted by a certain source is 2 x 10⁶m^-1The wave length of this light is.

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500 nm

500 m

200 nm

600 m

The net heat change in a chemical reaction is same whether it is brought about in two or more different ways in one or several steps. It is knnown as

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Henry's law

Hess's law

Joule's principle

Law of combustion

In order to mention the B.P. of water at 110°C, the external pressure should be

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Between 760 torr and 1200 torr

Between 200 torr and 760 torr

760 torr

Any value of pressure

In discharge tube, properties of X-rays depend upon the nature of.

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Residual gas

Cathode plate

Anode plate

All of these

An orbital which is spherical and symmetrical is

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S-Orbital

P - Orbital

d- Orbital

f - Orbital

Crystal to diamond is.

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Ionic

Molecular

Covalent

Metallic

The smallest collection of ions in an ionic compound is called.

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Formula unit

Chemical formula

Formula mass

Molecular formula

Which statement is incorrect about 64 g of SO2.

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It is one mole SO2

The number of SO2 molecule are 6.02 x 10²³

The number of oxygen atoms are 6.02 x 10²³

The number sulphur atom are 6.02 x 10²³

The crystals of caustic soda, NaOH, are hygroscopic when these crystals are exposed to air.

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Gain water and remains solid

Gain water and becomes liquid

Lose mass and remain solid

Remain unchanged on heating.

Which halogen will react spontaneously with Au(s) to produce Au³⁺

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Br₂

F₂

I₂

Cl₂

Industrially ethanal is prepared by air oxidation of.

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Ethane

Ethene

Ethyne

Acetic acid

The normal amount of overhead ozone is.

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300 DU

350 DU

400 DU

450 DU

Which one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

Ionization energy of calcium is.

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Lower than that of barium

Lower than that of magnesium

Higher than that of beryllium

Lower than that of strontium

The compound which can not be nitrated easily.

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Benzene

Nitrobenzene

Phenol

Toluene

Which isomerism is not found in alkenes.

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Chain isomerism

Positional isomerism

Geometrical isomerism

Metamerism

On heating aldehydes with Fehling's solution we get a precipitate whose colour is

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Pink

Black

Yellow

Brick red

Chile saltpeter has the chemical formal

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NaNO₃

KNO₂

Na₂B₄O₇

Na₂CO₃.H₂O

All of the following tests are used to identify aldehydes except.

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Tollen's test

Fehling test

Baeyer's test

Benedict test