alleryStart learning →In a chemical equation, the substances written on the left-hand side are the:
- reactants
- products
- solvents
- catalysts
Show answer and solution
Correct answer: A. reactants
Reactants are written on the left-hand side of a chemical equation.
Uttarakhand Board Class 10 Chemical Reactions and Equations — practice questions
Explore 32 free Chemical Reactions and Equations questions in Uttarakhand Board Class 10 Science. Open each question or exercise to read its content, reference answers and available explanation.
Practise Chemical Reactions and Equations with Quill →Chemical Reactions and Equations questions and exercises with answers
Showing questions 1–30 of 32.
In a chemical equation, the substances written on the left-hand side are the:Read the answer and worked solution →The substances formed in a chemical reaction are called the:Read the answer and worked solution →A balanced chemical equation has an equal number of atoms of each element on both sides because of the law of:Read the answer and worked solution →The reaction A + B → AB, where two substances combine to form one, is a:Read the answer and worked solution →A reaction of the type AB → A + B, where a single compound breaks into simpler substances, is a:Read the answer and worked solution →A reaction in which a more reactive element displaces a less reactive one from its compound is a:Read the answer and worked solution →Gain of oxygen (or loss of electrons) by a substance is called:Read the answer and worked solution →Loss of oxygen (or gain of electrons) by a substance is called:Read the answer and worked solution →A reaction in which oxidation and reduction occur simultaneously is called a:Read the answer and worked solution →The slow conversion of iron into rust in the presence of moisture and air is an example of:Read the answer and worked solution →The oxidation of fats and oils in food, producing a bad smell and taste, is called:Read the answer and worked solution →Decomposition brought about by passing electricity through a substance is called:Read the answer and worked solution →The decomposition of a substance on heating is called ___ decomposition:Read the answer and worked solution →Which observation does NOT necessarily indicate a chemical reaction?Read the answer and worked solution →Balance: H₂ + O₂ → H₂O.Read the answer and worked solution →Which principle requires us to balance chemical equations?Read the answer and worked solution →Balance: Fe + H₂O → Fe₃O₄ + H₂.Read the answer and worked solution →In Zn + 2 HCl → ZnCl₂ + H₂, the state symbol for HCl in solution is:Read the answer and worked solution →CaCO₃ → CaO + CO₂ is an example of which type of reaction?Read the answer and worked solution →In Fe + CuSO₄ → FeSO₄ + Cu, what kind of reaction is this?Read the answer and worked solution →2 H₂ + O₂ → 2 H₂O is a:Read the answer and worked solution →In the reaction Na₂SO₄ + BaCl₂ → BaSO₄ + 2 NaCl, what is observed?Read the answer and worked solution →Which of these is an endothermic reaction?Read the answer and worked solution →Which reaction does NOT need heat to proceed?Read the answer and worked solution →In the reaction CuO + H₂ → Cu + H₂O, the substance that is reduced is:Read the answer and worked solution →A reaction in which one substance is oxidised and another reduced is called a:Read the answer and worked solution →Rusting of iron requires which two conditions?Read the answer and worked solution →Chips packets are flushed with nitrogen mainly to:Read the answer and worked solution →In ZnO + C → Zn + CO, the reducing agent is:Read the answer and worked solution →Silver objects turn black on long exposure to air mainly because:Read the answer and worked solution →
Worked practice questions
The substances formed in a chemical reaction are called the:
- indicators
- products
- residues
- reactants
Show answer and solution
Correct answer: B. products
Products are the new substances formed, written on the right-hand side.
A balanced chemical equation has an equal number of atoms of each element on both sides because of the law of:
- multiple proportions
- constant proportions
- conservation of mass
- conservation of momentum
Show answer and solution
Correct answer: C. conservation of mass
Balancing reflects conservation of mass: atoms of each element are equal on both sides.
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