Chemistry Which of the following is used to increase the anti-knocking property of petrol ? Tetraethyl lead Trimethyl lead Triethyl lead Tetramethyl lead Tetraethyl lead Trimethyl lead Triethyl lead Tetramethyl lead ANSWER DOWNLOAD EXAMIANS APP
Chemistry Helium gas is filled in ballons because It is a noble gas It is one of the constitutents of water Its atomic number is 2 It is lighter than air It is a noble gas It is one of the constitutents of water Its atomic number is 2 It is lighter than air ANSWER DOWNLOAD EXAMIANS APP
Chemistry It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of CO CO2 SO2 Unburnt petrol CO CO2 SO2 Unburnt petrol ANSWER DOWNLOAD EXAMIANS APP
Chemistry The presence of ozone in the stratosphere is responsible for Increasing the average global temperature in recent years Higher rate of photosynthesis Supplying oxygen for people travelling in jets Checking the penetration of ultra-violet rays to the earth Increasing the average global temperature in recent years Higher rate of photosynthesis Supplying oxygen for people travelling in jets Checking the penetration of ultra-violet rays to the earth ANSWER DOWNLOAD EXAMIANS APP
Chemistry The most electronegative element among the following is bromine oxygen fluorine sodium bromine oxygen fluorine sodium ANSWER DOWNLOAD EXAMIANS APP
Chemistry J.J. Thomson’s proposed model of atom is generally called ________ model. Cream and cake Plum and pudding Cream and pudding Plum and cake Cream and cake Plum and pudding Cream and pudding Plum and cake ANSWER DOWNLOAD EXAMIANS APP
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