Question # 1

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

The no. of electrons in the valence shell of noble gases are

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2

4

8

2 or 8

Non-metals are generally soft, but which one of the following is extremely hard?

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Graphite

Phosphorus

Iodine

Diamond

The other name of modern periodic table is ________________ of periodic table.

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Long form

Simplified

Simplest

Nil

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

In peroxides, the oxidation no. of O is

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+1

-1

+3

-3

The valency of nitrogen is

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1

2

3

4

The No. of atoms in 1 mole of carbiton is

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6.02 x 1021

6.02 x 1022

6.02 x 1023

6.02 x 1024

____________ is prevented by Metallic coating.

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NaCl

Rust

All

None of these

____________ Is drawn in wires.

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Gold

Silver

Helium

Nil

Metal can form ions carrying charges:

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Uni-positive

Di-positive

Tri-Positive

All of them

Specific heat capacity of water is.

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4.2 KJg^-1 K^-1

4.2 Jg^-1K^-1

2.4 KJg^-1K^-1

2.4 Jg^-1K^-1

Which gas is used to manufacture king of chemicals sulphuric acid?

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N₂

O₂

Cl₂

S

Which one of the following disease causes severe diarrhea and can be fatal:

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Jaundic

Dysentery

Cholera

Typhoid

At equilibrium state there are possibilities: OR types of chemical equilibrium are.

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1

2

3

4

Which of one of the following is used as as fumigant:

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Ethyl alcohol

ethylene oxide

ethylene glycol

diethyl ether

What is the POH of a 0.02 M Ca(OH)₂?

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1.698

1.397

12.31

12.61

Monosaccharide consists of number of carbon atoms.

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2 to 4

4 to 8

3 to 9

5 to 10

Thousand of amino acids polymerize to form.

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Carbohydrates

Proteins

Lipids

Vitamins

When HCl and KOH is reacted the salt formed is.

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Acidic

Basic

Normal

Complex

Main component of natural gas is

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Methane

propane

Butane

Propene

when a system is in equilibrium state or in dynamic equilibrium state.

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Reactants and product are equal

Forward reactions stops

Reverse reactions stops

Forward reaction rate and reverse reaction rate

The wave number of the light emitted by a certain source is 2 x 10⁶m. the wavelength of this light is

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500 nm

500 m

200 nm

5 x 10⁷m

The free expansion of the gas from high pressure towards the low pressure causes

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Increase of temperature

Decrease of temperature

Grater number of collisions among the molecules

Decrease of velocity of gas molecules

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Fe is reduced

Fe is oxidized

CI₂is oxidized

None of these

Which is pseudo solid

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CaF2

Glass

NaCl

CaCl2

Several types of filter media are used for filtration depending on

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Natural of reactants

Nature of reaction

Size of precipitate

Nature of filter paper

An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are the main ions in the filtrate

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Which one of the following substances is not used as drying agent in desiccators.

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Calcium chloride

Phosphorus pentoxide

Silica gel

50% NaCl

More ideal gas at room temperature is.

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CO2

NH3

SO2

N2

If strip of Cu metal is placed in the solution of FeSO4

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Cu will be precipitated out

Fe is precipitated out

Cu and Fe both dissolves

No reaction takes place

Which statement is true about Na and Na+

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size of Na is greater than Na+

Size of Na is smaller than Na+

Both have equal size

Both have same properties

Which concentration unit is independent of temperature.

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Molarity

Molality

ppm

both a and b

For which mechanisms, the first step involved is the same

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E₁and E₂

E₂and SN₂

E₁and E₂

E₁and SN₁

Formalin is

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10% solution of formaldehyde in water

20% solution of formaldehyde in water

40% solution of formaldehyde in water

60% solution of formaldehyde in water

Paraldehyde is polymer of.

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HCHO

CH3CHO

CH3COCH3

CH3CH2-CH2OH

A caboxylic acid contains

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a hydroxyl group

a caboxyl group

a hydroxyl and carboxyl group

a carboxyl and an aldehyde group

CO₂H is a functional group as

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Alkoxy

Carbonyl

Carboxyl

Hydroxyl

Acetaldehyde reacts usually with

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Electrophiles only

Nucleophiles only

Electrophiles and nucleophiles

Free radicals only

-------------------- is Alcohol in the following

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CH₃.CH₂.OH

CH₃.O.CH₃

CH₃COOH

CH₃.CH₂.SH

The smog which have high contents of SO2 in it, is called.

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Reducing smog

Oxidizing smog

Natural smog

Neutral smog

The IUPAC name of CH3OCH6H5 is

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Methyl phenyl ether

Methaoxy benzene

Phenoxy methane

methoxy phenyl

Which one of the following elements commonly exhibits oxidation states of +6 and +3 in aqueous solution.

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Na

Cr

Mg

C

Which of the following is an ester.

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Soap

Starch

PVC

Dacron