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Question:- The mass number of a nucleus is A. always less than its atomic number B. the sum of the number of protons and neutrons present in the nucleus C. always more than the atomic weight D. a fraction
Answer:- Option B
Question:- The inexpensive and commonly used variety of glass is called soda glass. It is called so because A. was used initially for making bottles of soda(carbonated drink) B. is made using soda(sodium carbonate) C. was initially used for storing sodium carbonate D. is made using soda lime
Answer:- Option B
Question:- The gas used in the manufacture of vanaspati from vegetable oil is A. hydrogen B. oxygen C. nitrogen D. carbon dioxide
Answer:- Option A
Question:- The graphite rods in the nuclear reactor A. react with U to release energy B. produce neutrons C. undergo combustion which triggers the nuclear fission D. convert fast moving neutrons into thermal neutrons
Answer:- Option D
Question:- The first metal used by man was A. iron B. copper C. gold D. bronze
Answer:- Option B
Question:- The hydronium ion is A. H+ B. HO - C. H2+ D. H3O+
Answer:- Option D
Question:- The most electropositive elements among the following is A. Na B. Ca C. K D. Cs
Answer:- Option D
Question:- The method that cannot be used for removing permanent hardness of water is A. adding sodium carbonate B. distillation C. adding caustic soda D. boiling
Answer:- Option D
Question:- The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle? A. 3 billion years B. 100 years C. 0.01 minute D. 13 days
Answer:- Option C
Question:- The gas used for artificial ripening of green fruit is A. ethylene B. ethane C. carbon dioxide D. acetylene
Answer:- Option A
Question:- Zone refining is used for the purification of A. Au B. Ge C. Ag D. Cu
Answer:- Option B
Question:- The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is A. cineole B. engenol C. geraniol D. limonene
Answer:- Option A
Question:- The molecule which has the highest percentage of ionic character among the following is A. HI B. HF C. HCI D. HBr
Answer:- Option B
Question:- The high reactivity of fluorine is due to A. its high electro negativity B. small size of fluorine atom C. availability of d-orbitals D. strong F - F bond
Answer:- Option A