Easy

Q. Which metal is used as catalyst in Haber’s process for preparation of ammonia?

A. The metal used as a catalyst in the Haber’s process for the...

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Easy

1

Q. Write the names of two bio-degradable polymers.

A. Examples of biodegradable polymers : Polylactic acid (PLA) Polyhydroxybutyrate (PHB)

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Easy

Q. Explain the difference between minerals and ores.

A. Minerals Ores Minerals are naturally occurring substances found in the Earth’s crust....

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Easy

1

Q. Name two copper containing alloys. State one use of each alloy.

A. Two copper alloys: Copper Alloy Composition Uses Brass Copper (Cu): 60–80% Zinc...

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Moderate

Q. Fill up the blank: CaC₂ + N₂ → ____ + C

A. CaNCN / CaCN₂ (Calcium cyanamide) Explanation: Haber's process uses Fe as catalyst...

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Moderate

Q. What colour is produced when H₂S gas is passed through a solution of potassium dichromate...

A. (c) Green Explanation: H₂S properties include reaction with acidified potassium dichromate, turning...

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Moderate

Q. How can the given conversion be carried out?

A. The given conversion of ethene (H₂C = CH₂) to ethane (H₃C –...

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Easy

Q. What is now used in electrical circuits instead of fuse wire?

A. MCB / Miniature circuit breaker

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Easy

Q. What type of lens is used as a magnifying glass?

A. Convex lens Explanation: Convex lens forms virtual, erect, magnified image for objects...

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Easy

Q. Name the greenhouse gas discharged from a refrigerator.

A. CFC / HFC

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Easy

Q. Which layer of atmosphere is susceptible to storm and rain?

A. Troposphere Explanation: Troposphere is the lowest layer nearest to Earth's surface, where...

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Easy

Q. Which gas is produced at the cathode during electrolysis of acidified water?

A. Hydrogen. Explanation: In electrolysis of acidified water with Pt electrodes, H⁺ ions...

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