General Science – Exercise – 1

21. Brass gets discoloured in air because of the presence of which of the following gases in air?

(a) Oxygen
(b) Hydrogen sulphide
(c) Carbon dioxide
(d) Nitrogen

Answer
Answer : (b)
Explanation
Explanation :  No answer description available for this question. Let us discuss.
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22. Washing soda is the common name for

(a) Sodium carbonate
(b) Calcium bicarbonate
(c) Sodium bicarbonate
(d) Calcium carbonate

Answer
Answer : (a)
Explanation
Explanation :  What is the scientific name for washing soda? Sodium carbonate (also known as washing soda or soda ash), Na2CO3 is a sodium salt of carbonic acid. Scientific name for baking soda? Sodium bicarbonate or sodium hydrogen carbonate is the chemical compound with the formula NaHCO3. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. Since it has long been known and is widely used, the salt has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda. Let us discuss.
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23. Which of the gas is not known as green house gas?

(a) Methane
(b) Nitrous oxide
(c) Carbon dioxide
(d) Hydrogen

Answer
Answer : (d)
Explanation
Explanation :  In order, the most abundant greenhouse gases in Earth’s atmosphere are: * water vapor * carbon dioxide * methane * nitrous oxide * ozone * chlorofluorocarbons Let us discuss.
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24. Chemical formula for water is

(a) NaAlO2
(b) H2O
(c) Al2O3
(d) CaSiO3

Answer
Answer : (b)
Explanation
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25. The filament of an electric bulb is made of

(a) tungsten
(b) nichrome
(c) graphite
(d) iron

Answer
Answer : (a)
Explanation
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