Chemistry Exam

Which of the following is fully fluorinated polymer?

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Neoprene
Teflon
Thiokol
PVC

How many nodes does a 4d orbital possess?

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3, of which 1 is an angular node and 2 are radial nodes
3, of which 2 are angular nodes and 1 a radial node
3, of which all are radial nodes
3, of which all are angular nodes

Which one of the following pairs is not correctly matched?

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Dry ice : Solid carbon dioxide
Mustard gas : Poisonous liquid used in chemical warfare
Teflon : Polymer containing fluorine
Fullerene : Organic compounds containing fluorine

Which one of the following is the softest?

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Sodium
Iron
Aluminium
Lithium

Which of the following is also known as wood alcohol?

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Methanol
Ethanol
Propanol
Butanol

The method of concentrating the ore which makes use of the difference in density between ore and impurities is called:

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Liquation
Leaching
Levigation
Magnetic separation

The gas used for artificial ripening of green fruit is:

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Ethylene
Ethane
Carbon dioxide
Acetylene

The substance that contains the maximum amount of nitrogen is ?

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Ammonium Sulphate
Urea
Ammonium Nitrate
Ammonium Chloride

Elimination of bromine from 2-bromobutane results in the formation of-

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Equimolar mixture of 1 and 2-butene
Predominantly 2-butene
Predominantly 1-butene
Predominantly 2-butyne

The partial pressure of a component in a gas-phase reaction is 0.452 atm. What is the activity of the component?

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0.452 bar
0.458
0.458 bar
0.452 atm

Radiation from a mercury lamp source is of energy 2.845 eV. Calculate the wavelength of the radiation.

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579.0 nm
355.0 nm
404.7 nm
435.9 nm

The ejection of electrons when a metal surface is irradiated is known as:

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Black body radiation
Photoelectric effect
Zeeman effect
Atomic spectrum

Which of the following elements behave chemically both as a metal and a non metal?

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Boron
Carbon
Argon
Mercury

Alkali metals belong to which group in periodic table?

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Group 0
Group 2
Group 3
Group 1

The credit of construction of first nuclear reactor goes to -

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Niels Bohr
Fermi
Einstein
Oppenheimer

A mole contains Avogadro's number of items. What is Avogadro's number?

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6023
6.023 x 10^23
6.02 x 10^-23
3 x 10^8

Which of the following is produced during the formation of photochemical smog ?

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Nitrogen Oxides
Hydrocarbons
Methane
Ozone

Which metal is heaviest ?

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Osmium
Mercury
Iron
Nickle

Which one has the highest boiling point?

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He
Ne
Kr
Xe

Which of the following is/are not caused due to Nitric oxide pollution? (1) Leaf spotting in plants (2) Bronchitis-related respiratory problems in human (3) Production of corrosive gases through photochemical reaction (4) Silicosis in human

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1 and 3
Only 1
1, 2 and 4
Only 4

Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of these statements gives the correct picture?

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The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number down the group
In both the alkali metals and the halogens the chemical reactivity decreases with increase in atomic number down the group
Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens
In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group

Which is also called Stranger Gas ?

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Xenon
Neon
Argon
Nitrous oxide

Which of the following statements about diamond are correct? (1) It is used as a gem in jewellery because of its ability to reflect light. (2) It is good conductor of electricity. (3) It is used for cutting glass, marble stones and other hard materials. (4) It is used for drilling of rocks. Select the correct answer using the codes given below :

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1, 3 and 4
2, 3 and 4
1, 2 and 3
2 and 4

The highest electrical conductivity of the following aqueous solutions is of:

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0.1 M acetic acid
0.1 M chloroacetic acid
0.1 M fluoroacetic acid
0.1 M difluoroacetic acid

Which of the following statements is always true for a liquid mixture of two components A and B in equilibrium with a mixture of their vapours?

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μA(l) = μB(l) and μA(g) = μB(g)
μA(l) = μA(g) = μB(l) = μB(g)
μA(l) = μA(g) and μB(l) = μB(g)
μA(l) ≠ μA(g) ≠ μB(l) ≠ μB(g)

Which one of the following pairs is correctly matched?

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Silver iodide — Horn silver
Silver chloride — Artificial rain
Zinc phosphide — Rat poison
Zinc sulphide — Philosopher’s wool

Electrons with energy 80 keV are incident on he tungsten target of an X-ray tube. K-shell electrons of tungsten have - 72.5 contain only k.v energy. X-rays emitted by the tube:

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A continuous X-ray spectrum (Br mssttrrahlung) with a minimum wavelength of ~ 155 A
A continuous X-ray spectrum (B emsstrahlung) with all wavelengths
The characteristic X-ray spectrum of tungsten
A continuous X-ray spectrum ( Bremsstrahlung) with a minimum wavelength of ~ 155 A and the characteristic X-ray spectrum of tungsten

During a negative beta decay:

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An atomic electron is ejected
An electron which is already present within the nucleus is ejected
A neutron in the nucleus decays emitting an elect on
A part of the binding energy of the nucleus is converted into an electron

Among the following mixtures, dipole-dipole as the major interaction, is present in:

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Benzene and ethanol
Acetonitrile and acetone
KCl and water
Benzene and carbon tetrachloride

Three of the most common states of matter are solids, liquids, and gases. A liquid has:

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A defined volume, but not a defined shape
A definite shape, but no defined volume
A definite volume and shape
No defined volume or shape

Chemistry Exam : Question 1 of 30