Miscellaneous And Useful Chemical Compounds (Part-III)

  1. (d) Radiometer

 

Total Questions: 50

21. Bleaching powder is: [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-II)]

Correct Answer: (b) Ca(OCl)₂
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochlorite. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

22. What is the common name of Ca(OCl)₂? [S.S.C. Online Graduate Level (T-I) 11.08.2017 (Shift-III)]

Correct Answer: (c) Bleaching powder
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochlorite. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

23. What is the common name of calcium hypochlorite? [S.S.C. Online C.P.O.S.I. (T-I) 5.07.2017 (Shift-II)]

Correct Answer: (b) Bleaching powder
Solution:Ca(OCl)₂ is a common name for bleaching powder, whose chemical name is calcium hypochlorite. It is an inorganic compound, which is white in color. This gives off a strong chlorine smell. It is also used to make chloroform and chlorine gas.

24. What is the generic name of calcium sulphate hemihydrate? [S.S.C. Online C.H.S.L. (T-I) 04.08.2021 (Shift-II)]

Correct Answer: (a) Plaster of Paris
Solution:Calcium sulfate hemihydrate (CaSO₄·½H₂O) is also known as plaster of Paris. It is also used in ceramics, the medical field, and construction work.

25. Plaster of Paris is obtained by heating: [S.S.C. Online MTS (T-I) 5.10.2017 (Shift-I)]

Correct Answer: (a) Gypsum
Solution:Gypsum is a soft sulfate mineral, which occurs as calcium sulfate dihydrate (CaSO₄·2H₂O). When gypsum is superheated (about 150°C), a white powder containing powdered calcium sulfate hemihydrate [CaSO₄·½H₂O] is obtained. This is called Plaster of Paris.

26. Which of the following is the chemical name of baking soda? [S.S.C. Online Graduate Level (T-I) 11.06.2019 (Shift-I)]

Correct Answer: (b) Sodium Hydrogen Carbonate
Solution:The chemical name of baking soda is sodium hydrogen carbonate. Its chemical formula is NaHCO₃.

27. The by-product of the soap industry is: [C.P.O. S.I. 5.06.2016 (Shift-II)]

Correct Answer: (b) Glycerol
Solution:Sodium hydroxide (NaOH) is a white crystalline solid. It is soluble in water. Its aqueous solution is as smooth as soap. Sodium hydroxide (NaOH) is a combustible substance. It blisters on the skin, hence it is called ‘burning soda’. It is used to make soap. On hydrolysis of oil or fat with caustic soda solution, soap and glycerol are formed. This process is called saponification of oil or fat.

28. Soaps are sodium salts of which of the following? [S.S.C. Online MTS (T-I) 18.09.2017 (Shift-III)]

Correct Answer: (b) Fatty acids
Solution:Soaps are sodium or potassium salts of long-chain fatty acids, obtained by reacting triglycerides with strong bases such as sodium hydroxide, etc.

29. Which of the following is not true about X-rays? [S.S.C. Graduate Level(T-I) 29.08.2016 (Shift-I)]

Correct Answer: (a) They have low penetrating power
Solution:X-rays are electromagnetic waves. Due to the relatively low penetrating power of gamma rays, they are used in the medical field. Their penetrating power is much higher than other rays (ultraviolet, visible, infrared, etc.). Hence, the desired answer would be an option (a). Other options are correct.

30. Device used for the detection and measurement of all types of radiation (Alpha, Beta, and Gamma) [S.S.C. Online CHSL (T-I) 9.01.2017 (Shift-III)]

Correct Answer: (a) Geiger Counter
Solution:The Geiger counter is used to detect radioactive radiations such as α (alpha), β (beta), and γ (gamma) rays. The tube of this device is filled with an inert gas, which ionizes when exposed to high-energy radiation. The electrons of the ionized inert gas produce such an electric current, which causes deviation in the needle of the counter meter and the nature of the radiation associated with it is detected. It was discovered by Hans Geiger and Walther Müller. Hence it is also known as the Geiger-Muller counter.