Chemistry Exam

The molecule which has the highest percentage of ionic character among the following is:

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HI
HF
HCI
HBr

What is extracted from Bauxite ?

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Mica
Aluminium
Copper
Tin

Lattice energy of an ionic compounds depends upon:

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Charge on the ion only
Size of the ion only
Packing of ions only
Charge on the ion and size of the ion

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

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Boron
Carbon
Argon
Mercury

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

Which one of the following is correct?

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Unsaturated oils tend to be solid at room temperature
Saturated oils tend to be liquid at room temperature
Saturated oils tend to be solid at room temperature
None of the above

Which of the following oxides is amphoteric in character?

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CaO
CO2
SiO2
SnO2

What is laughing gas ?

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Nitrous oxide
Nitric oxide
Nitrogen oxide
Nitrogen peroxide

Which of the following gas is used in cigarette lighters ?

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Butane
Propane
Methane
Ethane

Which among the following methods can be used to remove the permanent hardness in water due to calcium or magnesium sulphates?

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Sulphonate method
Nitrate method
Zeolite method
None of these

If the kinetic energy of a free elect on doubles, its de-Broglie wavelength changes by the factor:

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2
0.5
√2
1 / √2

Which of these elements is a nonmetal?

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Sulfur
Manganese
Aluminum
Beryllium

Alloys made with mercury as one metal are called ?

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Mixtures
Emulsions
Solders
Amalgams

Zone refining is used for the purification of:

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Au
Ge
Ag
Cu

What does the airbag, used for safety of car driver, contain?

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Sodium bicarbonate
Sodium azide
Sodium nitrite
Sodium peroxide

Which of the following statements is true for an ideal-dilute solution?

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The solute and solvent both obey Raoult's law
The solute obeys Raoult's law and the solvent obeys Henry's law
The solute obeys Henry's law and the solvent obeys Raoult's law
The solute and solvent both obey Henry's law

Faraday's Law is associated with:

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Reaction of gases
Pressure of gases
Electrolysis
Temperature and pressure

Which one the following ions has the highest value of ionic radius?

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Li+
F-
O2-
B3+

Which among the following acids is abundant in Grapes, Bananas and Tamarind?

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Lactic Acid
Oxalic Acid
Salicylic Acid
Tartaric Acid

What is the hardest form of carbon ?

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Coke
Graphite
Charcoal
Diamond

The heat required to raise the temperature of body by 1 K is called:

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Specific heat
Thermal capacity
Water equivalent
None of the above

Heating mixture of Cu2O and Cu2S will give:

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Cu + SO2
Cu + SO3
CuO + CuS
Cu2SO3

The correct order of these fuels in terms of their calorific value in increasing order is (1) Hydrogen gas (2) Kerosine oil (3) Charcoal (4) Wood

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

Which of the following is an alkaline earth metal?

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Potassium
Calcium
Lead
Copper

Acids taste is:

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Sour
Sweet
May be both
None of both

The most abundant element in the earth's crust is ?

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Aluminium
Nitrogen
Silicon
Oxygen

Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. Reason : The reaction between nitrogen and oxygen requires high temperature.

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Both assertion and reason are correct, and the reason is the correct explanation for the assertion
Both assertion and reason are correct, but the reason is not the correct explanation for the assertion
The assertion is incorrect, but the reason is correct
Both the assertion and reason are incorrect

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being:

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4f orbitals more diffused than the 5f orbitals
Lesser energy difference between 5f and 6d than between 4f and 5d orbitals
More energy difference between 5f and 6d than between 4f and 5d orbitals
More reactive nature of the actinoids than the lanthanoids

Which of the following substances is/are ozone depleting? Select the correct answer from the codes given below: (1) Chlorofluorocarbons (2) Halons (3) Carbon tetrachloride

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1 only
1 and 2 only
2 and 3 only
1, 2 and 3

If elements with principal quantum number n> 4 were not allowed in nature, the number of possible elements would be:

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4
32
60
64

Chemistry Exam : Question 1 of 30