Question # 1

The cathode of Daniel cell is made up of

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Zn

Cu

AI

C

Half life of C-14 ________________ years.

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5800

5700

5600

5500

Protons carry _________ charge.

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+

_

No

Neutral

A bond formed between two non-metals is expected to be:

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covalent

ionic

coordinate covalent

metallic

It is a triatomic molecule

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Sodium chloride

Water

Chalk

Glucose

Effusion is a property of:

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Gases

LIquids

Solids

Plasma

Potassium's atomic no. is :

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17

18

19

20

The elements of group 17 are called:

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Carbon family

Noble gases

Alkaline earth metals

Halogen family

Bucky balls are ____________ allotropic forms of carbon.

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1st

2nd

3rd

4th

The molar mass of H₂SO₄ is:

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98 g

98 amu

9.8 g

9.8 amu

The most important oligosaccharide is:

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Sucrose

Glucose

Fractose

Maltose

Who proved that the presence of hydrogen as the main constituent of all acids.

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Lavoisier

Humphrey Davy

Dalton

Arrhenius

Coal is blackish complex mixture of compounds of

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Carbon

Hydrogen

oxygen

All

Methyl orange produces which colour in basic solution

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Red

Yellow

Pink

White

The product of any Lewis acid-base reaction is a single specie called:

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free radical

adduct

molecular ion

conjugate

In which of the following groups, oxygen is attached on both sides with carbon atoms?

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Ketone

Ether

Aldehyde

Ester

Halogenation of alkanes in the presence of diffused sunlight takes place.

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Suddenly, only in one step

Slowly in one step

In a series of step

Fastly in two steps

Ozone id beneficial for us as it:

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absorbs infrared radiations

absorbs ultraviolet radiation

absorbs chlorofluorocarbons

absorbs air pollutants

Olefins is a Latin word meaning:

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inert

less reactive

oil forming

most reactive

The green house effect is proportional to the amount of which gas in air.

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CO₂

O₂

N₂

All of them

Orbitals having same energy are called

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Hybird orbitals

Valence orbitals

Degenerate orbitals

D-orbitals

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

A limiting reactant is one.

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Which is present in least amount

Which produces minimum number of moles of product

Which produces maximum number of moles product

Does not effect the amount of product.

One of the following statements about Born-Haber cycle is correct. Which is that statement

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Born-Haber cycle is different from Hess's law

The energy change in a cyclic process is not zero

The lattice energy of the crystalline substances can be calculated easily

Heat of formation of the product and the lattice energy of the substance can be calculated simultaneously

The charge on electron was determined by millikan in his oil drop experiment and its value is

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6.023 x 10^-23C

1.602 x 10^-23C

1.602 x 10^-19C

6.625 x 10^-34C

Molal boiling constant for water is 0.52 ^oC. If 6 g of urea is dissolved in 100 g of water, what will be its boiling point.

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100.52 ^oC

-100.52^oC

100^oC

99^oC

Gooch crucible is made of.

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Glass

Paper

Teflon

Procelain

The rate of diffusion of a gas of molar mass 72 as compared to H2 will be.

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1/6 times

1.4 times

6 times

same

Which substances has diffused melting point.

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Crystalline solids

Amorphous solids

Metallic solids

Covalent solids

If the salt bridge is not used between two half cells, then the voltage

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Decreases rapidly

Decreases slowly

Does not change

Drops to zero

Which is the least reactive of all the alkali metals

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Li

Na

K

Cs

Most likely product formed when formic acid is dehydrated in the presence of conc. H2SO4 is.

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CO2 and H2O

CO, CO2 and H2O

CO2 and H2

CO and H2O

Which one of the following elements has no variable valency.

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Zinc

Iron

cobalt

Manganese

Which one does not belong to the alkaline earth metals

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Be

Ba

Ra

Rn

Which oxide is amphoteric in nature.

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BeO

MgO

CaO

BaO

Which of the following is not an amino acid

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Aspartic acid

Lysin

Alanine

Aniline

The flavor of octylacetate is

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Orange

Apricot

Banana

Jasmine

Electron affinity is measure of energy

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Required to remover the electron

Released by adding an electron

Required to excite an electron

Released by removing an electron

Which substance is used to lower the melting point of NaCl in Down's cell

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CaCO3

CaCl2

MgSO4

AlCl3

Which one is alcylic compound

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Pyridine

Toluene

Ethyl Benzene

Ethylcyclobutane