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Class 10 · Science · Medium
→What will be the ratio of magnesium atoms to oxygen atoms in five formula units of magnesium oxide?
Class 10 · Science · Expert
→How many total atoms are present in three water molecules?
Class 10 · Science · Medium
→If the reactants and products are correct but the atoms of one element are unequal, what is the conclusion?
Class 10 · Science · Expert
→What is the main difference between a skeletal equation and a balanced equation?
Class 10 · Science · Hard
→Why is changing subscripts considered a serious error while balancing a chemical equation?
Class 10 · Science · Medium
→Which statement best explains the scientific need for a balanced chemical equation?
Class 10 · Science · Hard
→Why can a lower measured mass after gas escapes from an open container give a wrong conclusion?
Class 10 · Science · Medium
→In a closed container, gas and a precipitate both form during a reaction, but nothing escapes. What is the correct conclusion about mass?
Class 10 · Science · Expert
→In an unknown process a new substance formed gas evolved and total mass remained same in a closed container. What is the most suitable conclusion?
Class 10 · Science · Expert
→What is the correct difference in direction of energy between photosynthesis and respiration?
Class 10 · Science · Expert
→Why is respiration considered different from combustion yet an energy releasing chemical process?
Class 10 · Science · Expert
→When an iron nail is placed in a blue copper sulphate solution, the solution gradually turns green and a reddish-brown coating forms on the nail. What type of reaction is this?
Class 10 · Science · Expert
→If heat is written on the product side and the container is hot what is the correct conclusion?
Class 10 · Science · Expert
→If a container becomes cold and gas also evolves what is the most careful conclusion?
Class 10 · Science · Hard
→How is the reaction Zn + CuSO₄ → ZnSO₄ + Cu most accurately classified?
Class 10 · Science · Expert
→How does a nitrogen filled packet protect oily food?
Class 10 · Science · Expert
→What is the most correct reason why oily food kept in warm open air spoils quickly?
Class 10 · Science · Expert
→What is the basic chemical cause of rancidity of oils and fats?
Class 10 · Science · Expert
→What is the main reason why an oiled iron object rusts less?
Class 10 · Science · Medium
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