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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
Question:- The iron ore magnetite consists of A. Fe2O3 B. Fe3OH4 C. FeCO3 D. 3Fe2O3 .. 3H2O
Answer:- Option A
Question:- The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is A. 5x/36 B. 5x C. 7.2 x D. x/6
Answer:- Option A
Question:- The major constituent of air is A. nitrogen B. carbon dioxide C. oxygen D. hydrogen
Answer:- Option A