Chemistry A balloon filled with helium rises in air because Helium is less dense than air Helium pushes down on the air below the balloon The balloon is weightless Air exerts an upward force on the balloon Helium is less dense than air Helium pushes down on the air below the balloon The balloon is weightless Air exerts an upward force on the balloon ANSWER DOWNLOAD EXAMIANS APP
Chemistry Catalyst is a substance which None of these Decreases the rate of reaction Has no action on the rate of the reaction Increases the rate of the reaction None of these Decreases the rate of reaction Has no action on the rate of the reaction Increases the rate of the reaction ANSWER DOWNLOAD EXAMIANS APP
Chemistry 'Plaster of Paris' is made by partial dehydration of Blue vitriol Epsom salt Green vitriol Gypsum salt Blue vitriol Epsom salt Green vitriol Gypsum salt ANSWER DOWNLOAD EXAMIANS APP
Chemistry The chemical name of rat poison is Lead nitrate Zinc oxide Potassium cyanide Zinc phosphide Lead nitrate Zinc oxide Potassium cyanide Zinc phosphide ANSWER DOWNLOAD EXAMIANS APP
Chemistry Which one is the most reactive gaseous element Bromine Iodine Flourine Chlorine Bromine Iodine Flourine Chlorine ANSWER DOWNLOAD EXAMIANS APP
Chemistry How many neutrons are there in 92U238 atom ? 146 238 92 330 146 238 92 330 ANSWER DOWNLOAD EXAMIANS APP
EXAMIANS