📘 Pure Substance- Element-Classification of Matter on the basis of Chemical Properties- II📚 Metals and its properties

Q1

Which one of the following is the highest reactive metal?

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📘 Chemical Reactions📚 Combination Reaction

Q2

Chemical reaction: CO2 + H2O -> H2CO3 is example of

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📘 Metallurgy📚 General Facts

Q3

Food cans are coated with Tin instead of Zinc, because:

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📘 Water📚 Permanent Hardness

Q4

Which one is responsible for the permanent hardness of water?

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📘 Carbon Allotropes📚 Misc

Q5

Which of the following is not an allotrope of carbon?

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📘 Physical States of Matter and Their properties📚 Solid

Q6

Dry ice is used for making cold-baths in laboratories by mixing with volatile organic solvents. Identify the form of dry ice from the following:

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📘 Carbon Allotropes📚 Carbon Allotrope (Crystalline)

Q7

Mineral texture of diamond is:

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📘 Chemistry in Everyday Life📚 Common Gases used in daily life (LPG, CNG, etc.)

Q8

Domestic gas, LPG is—

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📘 Environmental Chemistry📚 Misc

Q9

Assertion (A): Hydrogen gas is called as clean fuel. Reason(R): Combustion of hydrogen gas does not produce C.F.C (chlorofluorocarbon).

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📘 Chemistry in Everyday Life📚 Common Gases used in daily life (LPG, CNG, etc.)

Q10

Gasohol is-

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📘 Organic Chemistry📚 Hydrocarbons

Q11

Petrol (Gasoline) is a mixture of-

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📘 Metallurgy📚 Metals and Their Ores

Q12

Bauxite is the ore of:

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📘 Chemistry in Everyday Life📚 Common Gases used in daily life (LPG, CNG, etc.)

Q13

Most of the explosives in mines occur due to the mixing of which of the following?

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📘 Chemistry in Everyday Life📚 Misc

Q14

Alfred Nobel (founder of Nobel Prize) is related to:

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📘 Chemistry in Everyday Life📚 Misc

Q15

Which one of the following is used to make ‘bullet- proof jacket’?

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📘 Organic Chemistry📚 Alcohol

Q16

Molasses is the best raw material for:

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📘 Acids, Bases and Salts📚 pH Scale

Q17

pH is related to-

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📘 Acids, Bases and Salts📚 pH Scale

Q18

pH value of water is-

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📘 Solution📚 Misc

Q19

Isotonic solutions have identical

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📘 Radioactivity📚 Half-life

Q20

The half-life of a radioactive substance is 4 months. How much time it will take to decay 3/4th of substance?

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Chemistry - MOST IMPORTANT Uttarakhand PCS Previous Year Questions