Chemistry Questions for CDS & CAPF: 10th September


Dear Aspirants, Chemistry is an important subject in various exams like NDA, CDS, AFCAT, CAPF and other Police Exams. Here at Defence Adda we provide you with the quizzes based on the syllabus and pattern of these exams. The questions asked are of 10+2 level and preparing with a wide variety of questions will help you ace in these exams. Here is a quiz based on the latest syllabus of these exams based on topics like Metals, Non-metals, Oxidation and Reduction, Periodic Table etc to help you prepare with a wide variety of questions.


Q2. The flavour of apple is mainly due to which one of the following? 
(a) Formalin
(b) Benzene
(c) Ethanol
(d) Benzaldehyde

Q3. Nail varnish remover generally contains which one of the following?
(a) Vinegar
(b) Benzene
(c) Methyl alcohol
(d) Acetone

Q4. In which categories did Marie Curie win her two different Nobel prizes? 
(a) Physics and Chemistry
(b) Chemistry and Medicine
(c) Physics and Medicine
(d) Chemistry and Peace

Q5. ‘Freon’ used as refrigerants is chemically known as  
(a) chlorinated hydrocarbon
(b) fluorinated hydrocarbon
(c) chlorofluoro hydrocarbon
(d) fluorinated aromatic compound

Q6. German silver is an alloy of 
(a) gold and silver
(b) copper and silver
(c) copper, zinc and silver
(d) copper, zinc and nickel

Q7. The tracking of people by trained dogs is based on the recognition of which of the following compounds in the sweat from feet?  
(a) Carboxylic acids
(b) Uric acid
(c) Sugar
(d) Salt

Q8. Which of the following metals are present in haemoglobin and chlorophyll, respectively? 
(a) Fe and Mg
(b) Fe and Zn
(c) Mg and Zn
(d) Zn and Mg

Q9. Which one of the following is involved for desalination of sea water? 
(a) Reverse osmosis
(b) Simple osmosis
(c) Use of sodium aluminum silicate as zeolite
(d) Use of ion selective electrodes

SOLUTIONS

S1. Ans.(b)
Sol. Limestone (CaCO_3 ) is the main raw material used in the manufacture of cement. Copper is a good conductor of electricity hence, it is used in electrical goods. 
Bauxite is an ore of Al. It is used in the manufacture of aeroplanes. Manganese is used in the steel industry to form manganese steel. 

S2. Ans.(c)
Sol. The flavour of apples is mainly due to the ethanol (C_2 H_5 OH).

S3. Ans.(d)
Sol. Nail varnish remover generally contains acetone (CH_3 COCH_3 ).

S4. Ans.(a)
Sol. 
Marie Curie win her two different Noble prizes in two different category i.e., Physics and Chemistry for the discovery of radium and polonium. 

S5. Ans.(c)
Sol. Chlorofluorocarbon (CF_2 Cl_2 ) is also known as Freon. It is used as refrigerants in refrigerators and air conditions. It is also used as a propellant in aerosols and foams. 

S6. Ans.(d)
Sol. 
German silver is an alloy of copper (25-50%), zinc (25–35%) and nickel (10-35%). It is used in utensils and resistance wire. 

S7. Ans.(a)
Sol. The tracking of people by trained dogs is based on the recognition of carboxylic acid in the sweat from feet. 

S8. Ans.(a)
Sol. Fe and Mg metals are present in haemoglobin and chlorophyll respectively. 

S9. Ans.(a)
Sol. Reverse osmosis method is used to obtain pure water from water containing a salt or for desalination of sea water. 



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