Easy
0 likes
Question
Write two reasons why curd and sour fruits are not kept in copper and brass vessels for a long time
WBBSE
Class X
Physical Science
Metallurgy
02 Mark
2026
Answer
Curd and sour fruits contain acids. Therefore, they should not be kept in copper or brass vessels for a long time because:
- The acids react with the metals present in the vessels and form metal salts.
- These metal salts may be toxic and harmful to health, making the food unfit for consumption.
Related Questions
More WBBSE Easy level questions
1/12
Easy
Q.
Which of the following elements is not present in Duralumin? (a) Al (b) Zn (c)...
A.
(b) Zn Explanation Duralumin is an alloy composed mainly of: Aluminium (Al)...
View Question
Easy
Q.
In the extraction of aluminium by electrolysis, what substances are present in the molten mixture...
A.
Besides pure alumina (Al₂O₃), the molten mixture contains: Cryolite (Na₃AlF₆) Fluorspar (CaF₂)...
View Question
Easy
Q.
Untitled
A.
2.11.1 – (c) 2.11.2 – (d) 2.11.3 – (b) 2.11.4 – (a)
View Question
Easy
986
Q.
Match the right column with the left column: 2.11.1. Noble Gas (a) Cs2.11.2. Inver (b)...
A.
Left Column Right Column (1) Noble Gas (b) Rn (2) Inver (d)...
View Question
Easy
733
Q.
The metal which is extracted through thermal reduction is
A.
(c) Fe Explanation Iron (Fe) is extracted by thermal reduction (reduction of...
View Question
Easy
779
Q.
2.11.1. An alkaline earth metal (a) Fe 2.11.2. The metal which is present in the...
A.
2.11.1 → (c) Ca 2.11.2 → (a) Fe 2.11.3 → (d) K...
View Question
Easy
963
Q.
Which of the following is the formula of zine blende, an ore of zinc?
A.
b. ZnS Explanation: Zinc blende is the chief ore of zinc, and...
View Question
Easy
955
Q.
What reaction occurs at the cathode in the electrolyte method of extraction of aluminium?
A.
At the cathode in the electrolyte method of aluminium extraction, aluminium ions...
View Question
Moderate
Q.
Why does a copper vessel turn green in open air?
A.
Copper reacts slowly with moist air containing oxygen, carbon dioxide and water...
View Question
Moderate
594
Q.
Why is dehydrated calcium chloride added during the extraction of sodium through electrolysis of sodium...
A.
Dehydrated calcium chloride (CaCl2) is added during the electrolysis of sodium chloride...
View Question
Moderate
735
Q.
In the extraction of metal by the process of electrolysis at which electrode does the...
A.
The reaction occurs at the cathode during the process of electrolysis. This...
View Question
Easy
Q.
Name the metal which is extracted in thermite process.
A.
Iron (Fe) Explanation The thermite process is used to extract or weld...
View Question