Search questions
Use text search or combine filters to find exactly the questions you need.
Class 10 · Science
→On heating lead nitrate, brown fumes indicate the presence of which gas?
Class 10 · Science
→Which substance is the yellow solid residue formed on thermal decomposition of lead nitrate?
Class 10 · Science
→Which pair correctly identifies the brown gas and the colourless gas formed when lead nitrate is heated?
Class 10 · Science
→During the thermal decomposition of calcium carbonate, the evolved gas is passed through lime water, which turns milky. This confirms the presence of which gas?
Class 10 · Science
→In the reaction \(\mathrm{CuO + H_2 \rightarrow Cu + H_2O}\), which of the following statement is correct?
Class 10 · Science
→Why is the reaction between calcium oxide and water called an exothermic combination reaction?
Class 10 · Science
→What is the correct name of the product formed when water is added to calcium oxide?
Class 10 · Science
→Why can burning of magnesium be considered both combination and oxidation?
Class 10 · Science
→Why does removing the layer formed on the surface of a magnesium ribbon make its burning clearer?
Class 10 · Science
→What will be the ratio of magnesium atoms to oxygen atoms in three units of magnesium oxide?
Class 10 · Science
→What is the total number of atoms in two water molecules?
Class 10 · Science
→If the number of atoms of any one element is not the same on the reactant and product sides of a chemical equation, what is the equation called?
Class 10 · Science
→Why is it safer to change coefficients rather than subscripts when balancing a chemical equation?
Class 10 · Science
→While balancing a chemical equation, the number of atoms of each element is kept the same on the reactant and product sides. Which law does this demonstrate?
Class 10 · Science
→Why is measuring less mass after gas escapes from an open container not against conservation of mass?
Class 10 · Science
→In a closed container a metal reacts with acid and gas forms but does not escape. What is the most suitable conclusion about total mass?
Class 10 · Science
→In an unknown process, a new substance was formed, the colour changed, and the total mass remained the same in a closed container. What is the most appropriate conclusion?
Class 10 · Science
→What is the correct distinction between the symbols ext{(aq)} and ext{(l)} in a chemical equation?
Class 10 · Science
→What is the correct respective meaning of upward arrow and downward arrow?
Class 10 · Science
→