CHEMISTRY (Part-III) (Railway)

Total Questions: 50

11. Which of the following state-ments is INCORRECT? [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

(1) Bauxite (Al₂O₃2H₂O) is an оге.
(2) Copper, Calcium and Sodium are metals.
(3) Copper Pyrites (CuFeS₂) and Cuprite (Cu₂O) are minerals.
(4) Zinc (Zn), Magnetine (Fe₃O₄) and Silver (Ag) are metals.

Correct Answer: (4) Zinc (Zn), Magnetine (Fe₃O₄) and Silver (Ag) are metals.

Solution:A native metal is one that exists in nature (on earth's surface) in its actual metallic form. It can either exist in pure form or as an alloy. Some such native metals include iron, tin, tungsten, antimony, arsenic and zinc. Magnetite is a rock mineral and one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself.

12. What is the formula of Magnesium nitride? [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

(1) Mg₂N₃
(2) Mg(NO₂)₂
(3) Mg(NO₃)₂
(4) Mg₃N₂

Correct Answer: (4) Mg₃N₂

Solution:Magnesium nitride, which possesses the chemical formula Mg₃N₂, is an inorganic compound of magnesium and nitrogen. At room temperature and pressure it is a greenish yellow powder.

13. Select the INCORRECT set of Molecular Formula - IUPAC Name - Common Name from the following options. [RRB RPF/RPSF SI Exam, 04.09.2018 Shift-III]

(1) C₂H₅OH – Ethanol – Ethyl Alcohol
(2) C₄H₉OH – Butanol – Butyl Alcohol
(3) CH₃OH – Methanol – Methyl Alcohol
(4) C₂H₇OH – Propanol – Propyl Alcohol

Correct Answer: (4) C₂H₇OH – Propanol – Propyl Alcohol

Solution:Propanol (C₃H₇OH) is a colorless liquid and is also sometimes called propan-1-ol, n-propyl alcohol, 1-propyl alcohol, or n-propanol. As such, propanol is a major constituent of fuel oil. Propanol is usually produced industrially by a catalytic hydrogenation of propionaldehyde.

14. What formula is used to find a very simple ratio of the number of atoms in a compound? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-II]

(1) Chemical formula
(2) Empirical formula
(3) Structural formula
(4) Molecular Formula

Correct Answer: (2) Empirical formula

Solution:The empirical formula of a compound is defined as the formula that shows the ratio of elements present in the compound, but not the actual numbers of atoms found in the molecule. The ratios are denoted by subscripts next to the element symbols. The empirical formula is also known as the simplest formula because the subscripts are the smallest whole numbers that indicate the ratio of elements.

15. What we call it carbonic Nuclear or open range ...? [RRB RPF/RPSF SI Exam, 06.01.2019 Shift-III]

(1) Allefatic Nuclear
(2) Opposite side Nuclear
(3) Fregrance Nuclear
(4) Equivalent Nuclear

Correct Answer: (3) Fregrance Nuclear

Solution:An aliphatic compound is an organic compound containing carbon and hydrogen joined together in straight chains, branched chains, or non-aromatic rings. It is one of two broad classes of hydrocarbons, the other being aromatic compounds. Ethylene, isooctane, acetylene, propene, propane, squalene, and polyethylene are examples of aliphatic compounds.

16. Which one is the natural source of the Acetic acid ? [RRB RPF/RPSF SI Exam, 10.01.2019 Shift-II]

(1) Orange
(2) Lemon
(3) Vinegar
(4) Tamarind

Correct Answer: (1) Orange

Solution:Acetic acid (CH₃COOH), also called ethanoic acid is the most important of the carboxylic acids. It is recognized for giving vinegar its sour taste and pungent smell. Vinegar is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water.

17. What is the source of formula for 'Methane'? [RRB RPF/RPSF SI Exam, 10.01.2019 Shift-II]

(1) CH₄
(2) C₃H₈
(3) CO₂
(4) C₂H₄

Correct Answer: (3) CO₂

Solution:Methane is a chemical compound with the chemical formula CH₄.. It is a group-14 hydride and the simplest alkane and is the main constituent of natural gas.

18. __________ is a group of silicate minerals which have perfect basal cleavage and can easily be split into then plastic sheets. [RRB RPF/RPSF SI Exam, 10.01.2019 Shift-II]

(1) Gypsum
(2) Quartz
(3) Mica
(4) Feldspar

Correct Answer: (1) Gypsum

Solution:Mica is a sheet silicate and the sheets are easy to separate from each other because there are weak chemical bonds holding them together. This gives them perfect cleavage, the most characteristic feature of mica minerals. Mica are found in all three major rock varieties-igneous, sedimentary, and metamorphic.

19. What is atomic number of element Indium? [RRB RPF/RPSF SI Exam, 10.01.2019 Shift-III]

(1) 49
(2) 36
(3) 44
(4) 54

Correct Answer: (1) 49

Solution:Indium is a chemical element with the symbol In and atomic number 49. Indium is the softest metal that is not considered to be an alkali metal. It is a silvery-white metal that resembles tin in appearance.

20. What is IUPAC name of Acetic Acid? [(RRB RPF/RPSF SI Exam, 10.01.2019 Shift-III]

(1) Ethanoic Acid
(2) Butanoic Acid
(3) Methanoic Acid
(4) Propanoic Acid

Correct Answer: (1) Ethanoic Acid

Solution:The trivial name acetic acid is the most commonly used and preferred IUPAC name. The systematic name ethanoic acid, a valid International Union of Pure and Applied Chemistry (IUPAC) name, is constructed according to the substitutive nomenclature.

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