Chemistry What is the element that is in the highest percentage in the composition of the earth ? Oxygen Magnesium Iron Silicon Oxygen Magnesium Iron Silicon ANSWER DOWNLOAD EXAMIANS APP
Chemistry An element of atomic no. 29 belongs to F-block P-block D-block S-block F-block P-block D-block S-block ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which gas is most stable at room temperature H2 F2 N2 O2 H2 F2 N2 O2 ANSWER DOWNLOAD EXAMIANS APP
Chemistry The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle? 13 days 3 billion years 0.01 minute 100 years 13 days 3 billion years 0.01 minute 100 years ANSWER DOWNLOAD EXAMIANS APP
Chemistry Of the following, which one pollutes the air of a big city ? Copper Cadmium Chromium Lead Copper Cadmium Chromium Lead ANSWER DOWNLOAD EXAMIANS APP
Chemistry What is the most commonly used substance in fluorescent tubes? Mercury oxide and neon Sodium oxide and argon Sodium vapour and neon Mercury vapour and argon Mercury oxide and neon Sodium oxide and argon Sodium vapour and neon Mercury vapour and argon ANSWER DOWNLOAD EXAMIANS APP
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