Question # 1

When the rate of the forward reaction takes place at the rate of reverse reaction the composition of the reaction mixgure remains consant. It is called.

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Chemical Equilibrium

Static equilirbirum

Both a and b

None of the above

Which acid is used in he preparation of soaf.

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Oxalic Acid

Citric Acid

Stearic Acid

Tartaric Acid

During the glycolysis net ATP produced are.

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2

4

6

8

The boiling point of alcohal is

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₄₄^oC

78^oC

53^oC

19^oC

Diamond is...................

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conductor

non -conductor

both a and b

None of these

Which branch of chemistry helps to protectwater that bas been poisoned by soil.

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Organic chemistry

inorganic chemistry

Environmenal chemistry

Geochemistry

Which of the following is a heterogeneous mixture

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Concrete mixture

a solution of potassium nitrate in water

a solution of calcium hydroxide in water

Hot chocolate

Whcih types of bond is present between NH3 and BF3

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Covalend Bond

Ionic Bond

Co ordinate covalent bond

Metallic Bond

How many elements are present in 1st period.

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1

2

8

18

The colour of hydrated cobalt(II) chloride solid is

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White

Black

Blue

Pink

In an irrversibel reaction equilibrium

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Never establised

Established quickly

Established slowly

Established when reaction stops

At dynamic equilibrium state:

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Rate of forward reaction≠ Rate of reverse reaction

Rate of forward reaction > Rate of reverse reaction

Rate of forward reaction = Rate of reverse reaction

Rate of forward reaction < rate of reverse reaction

Imperial chemical industries was established in.

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1942

1944

1950

1990

The elements that do not conduct heat and electricity are called.

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Metallurgy

Non metal

Metalloid

Alloy

The characteristics of reversible reactions are the following except:

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Products never recombine to form reactants.

They never complete

The proced in both ways

They have a double arrow between reactants and products.

The envelope of different gases around the earth is called.

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Atmosphere

Brosphere

Lithosphere

Hydrosphere

In shoe polished, which chemical is used.

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Ethanol

Methanol

Carbon black

Formaldehyde

Out of twenty how many amino acids can by synthesized by human body?

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Five

Ten

Seven

Twelve

General formula of Alkane is.

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C₁₀H_2n-2

C₆H₂₆

C₁₁H_2n-2

C_nH_2n-2

Organic compounds contain:

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ionic bond

Covalent bond

Metallic bond

Co-ordinate covalent

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

Which is not a poisonous gas?

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Ozone

Chlorine

Carbon di oxide

All of them

The nature of positive rays depends on

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The nature of electrode

The nature of discharge tube

The nature of residual gas

All of the above

The mathematical relation between the rate of reaction and the concentrations of the reactants is known as the

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Rate equation

Rate law

Arrhenius equation

Both a and b

Which one of the following expressions is for ideal gas equation.

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PM= nRT

PV = nRT

PV = dRT

PV= nTP

Relative lowering of vapour pressure is equl to.

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Mole fraction of solute

Mole fraction of solvent

Molarity

Molality

The S.I. units for the molar heat capacity are

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Joule Cm^-3degree^-1

Joule deg^-1atm^-1

Joule deg^-1mol^-1

Joule deg^-1kg^-1

Colligative properties are used to determine the

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Freezing points

Boiling point

Atomic mass of an element

Molar mass of solute

Kw for water at 0 oc is 0.1 x 10^-34 and at 100 ^oC 7.5 x 10^-14, How many times dissociation of water increase from 0 ^oCto 100 ^oC

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7.5 times

50 times

75 times

100 times

n+1 value of 6d orbital is.

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08

09

10

18

The largest number of molecules are present in

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3.6 of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

Which is not used as drying agent in a desiccator.

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Cacl2

NaCl

P2O5

Salica Gel

The shape of Sncl2 molecule is.

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Linear

Angular

Trigonal planar

Tetrahedral

Which halogen will react spontaneously with Au to produce Au3+

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Br2

F2

I2

Cl2

Water is disinfected by a substance to avoid toxification

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KMnO₄

Alums

O₃

Cl₂

------------- does not belong to Alkaline-Earth metals

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Be

Ra

Ba

Rn

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

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Pink

Black

Yellow

Brick red

Acetic acid form a dimer in liquid phase because.

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Low ionization constant of acid

High solubility in water

Hydrogen bonding

Greater polarity

Which one of the following comp9ounds on hydrolysis will not produce a carboxylic acid.

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Alkyl halide

Alkyl Nitrite

Addition product of Grignard reagent and CO2

Ester boiled with sodium hydroxide

Total number of d-block elements are

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10

20

30

40

Which is more basic

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RbOH

NaOH

KOH

Li OH

Acid rain fist of all was observed by

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Augus Smith

Robert Hook

Mosley

Watson

Primary, Secondary and tertiary alcohols can be distinguish by.

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Iodoform test

Lucas test

Fehling solution

Ammoniacal silver nitrates

Alkyl halides are considered to be very reactive compounds towards nucleophile because

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They have an electrophilic carbon

They have an electrophilic carbon and a good leaving group

They have an electrophilic carbon and a bed leaving group

They have a nucleophilic carbon and a good leaving group