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UP Board Class 10 Chemical Reactions and Equations — practice questions

Explore 78 free Chemical Reactions and Equations questions in UP Board Class 10 Science. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Reactions and Equations questions and exercises with answers

Showing questions 1–30 of 78.

The notes calculate $\lambda_m^c$ using $\lambda_m^c = \dfrac{0.04 \times 1000}{0.1}$. What value is obtained?Read the answer and worked solution →From the expression shown, $\lambda_m^{\infty}(HA) = 400 + 500 - 50$, the limiting molar conductivity of $HA$ isRead the answer and worked solution →Heating copper nitrate crystals produces black copper oxide, reddish-brown nitrogen dioxide, and oxygen. This reaction is best classified asRead the answer and worked solution →What is the shape of a molecule whose central atom is $sp^3$ hybridised and has no lone pairs (e.g. $\mathrm{CH_4}$)?Read the answer and worked solution →![](https://qallery.app/diagrams/v2_bonding_seed_1/img-24.jpeg) What is the hybridisation of the central P atom in $\mathrm{PCl_5}$?Read the answer and worked solution →Arrange the bond angles of $\mathrm{H_2O}$, $\mathrm{NH_3}$ and $\mathrm{CH_4}$ in decreasing order.Read the answer and worked solution →Which of the following molecules has a **non-zero** dipole moment?Read the answer and worked solution →Using molecular orbital theory, the bond order of the $\mathrm{O_2}$ molecule is:Read the answer and worked solution →The modern periodic law states that the physical and chemical properties of elements are periodic functions of:Read the answer and worked solution →Elements of the modern periodic table are classified into how many blocks based on the differentiating electron?Read the answer and worked solution →Across a period from left to right, the atomic radius generally:Read the answer and worked solution →Which element has the highest first ionization energy in period 2?Read the answer and worked solution →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 →Hydrocarbons in which carbon atoms are joined only by single bonds are said to be:Read the answer and worked solution →Compounds having the same molecular formula but different structures are called:Read the answer and worked solution →A series of compounds in which successive members differ by a –CH₂– unit is called a:Read the answer and worked solution →The functional group present in alcohols is:Read the answer and worked solution →The functional group present in carboxylic acids is:Read the answer and worked solution →

Worked practice questions

The notes calculate $\lambda_m^c$ using $\lambda_m^c = \dfrac{0.04 \times 1000}{0.1}$. What value is obtained?

  1. 40
  2. 400
  3. 4000
  4. 4
Show answer and solution

Correct answer: B. 400

Compute $\lambda_m^c = \dfrac{0.04 \times 1000}{0.1} = \dfrac{40}{0.1} = 400$.

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From the expression shown, $\lambda_m^{\infty}(HA) = 400 + 500 - 50$, the limiting molar conductivity of $HA$ is

  1. 850
  2. 950
  3. 400
  4. 50
Show answer and solution

Correct answer: A. 850

Direct evaluation gives $400 + 500 - 50 = 850$. **Therefore, $\lambda_m^{\infty}(HA) = 850$.**

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Heating copper nitrate crystals produces black copper oxide, reddish-brown nitrogen dioxide, and oxygen. This reaction is best classified as

  1. combination
  2. displacement
  3. thermal decomposition
  4. neutralization
Show answer and solution

Correct answer: C. thermal decomposition

A single compound, copper nitrate, breaks down into simpler substances on heating. Since heat causes the breakdown, it is a thermal decomposition reaction.

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More Science topics

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