General Science Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

141. Prafulla Chandra Ray, who is known as father of chemical science in India, was founder of India’s first pharmaceutical company. What is name of that company?

[A] Hindustan Pharmaceuticals
[B] Orchid Chemicals & Pharmaceuticals
[C] Indian Drugs and Pharmaceuticals
[D] Bengal Chemicals and Pharmaceuticals

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142. Which of the following is correct combination of masses of the three sub-atomic particles?

[A] Electron – 0. 00055 amu; Proton – 1.0078 amu; Neutron – 1.0083 amu
[B] Electron – 0. 00055 amu; Proton – 1.0083 amu; Neutron – 1.0078 amu
[C] Electron – 0. 00055 amu; Proton – 1.0078 amu; Neutron – 1.0078 amu
[D] Electron – 0. 00055 amu; Proton – 1.0083 amu; Neutron – 1.0083 amu

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143. A tripositive ion has protons whose mass is equal to 23881 times that of an electron. What is the atomic number of that ion?

[A] 11
[B] 12
[C] 13
[D] 15

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144. If the mass of an atom is 37 and atomic number is 17, then what shall be number of neutrons and protons in it?

[A] 17 Neutrons, 17 Protons
[B] 20 Neutrons, 17 Protons
[C] 17 Neutrons, 20 Protons
[D] 37 Protons, 17 Neutrons

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145. Who was the first person to devise a periodic table of chemical elements arranged in order of their relative atomic masses?

[A] Dmitri Mendeleev
[B] John Dalton
[C] John Alexander Reina Newlands
[D] Johann Wolfgang Dobereiner

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146. Tartaric acid is used along with baking soda in baking breads and cakes. What is the use of Tartaric Acid in this process?

[A] It makes the bread / cake soft and fluffy
[B] It stops making of lumps in bread / cake
[C] It neutralizes the bitterness in bread / cake
[D] It gives sweet aroma in the bread / cake

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147. Why a milkman adds a very small amount of baking soda to fresh milk?

[A] To decrease its pH slightly
[B] To increase its pH slightly
[C] To kill the bacteria in Fresh Milk
[D] To turn its color from slight pale to white

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148. Indicators such as litmus can be used to determine:

  1. Acidity or alkalinity of a solution
  2. pH value of a solution

Select the correct option from the codes given below:

[A] Only 1
[B] Only 2
[C] Both 1 & 2
[D] Neither 1 nor 2

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149. Which does the gas turn lime water milky?

[A] Oxygen
[B] Hydrogen
[C] Carbon Dioxide
[D] Carbon Monoxide

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150. Limestone, chalk and marble are different forms of which of the following compounds?

[A] Calcium Chloride
[B] Calcium Carbonate
[C] Magnesium Carbonate
[D] Sodium Carbonate

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