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Andhra Pradesh SSC (Class 10) Chemical Reactions and Equations — practice questions

Explore 77 free Chemical Reactions and Equations questions in Andhra Pradesh SSC (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 77.

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 →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 →The common name of ethanoic acid, a dilute solution of which is called vinegar, is:Read the answer and worked solution →The reaction of an alcohol with a carboxylic acid in the presence of an acid catalyst, forming a sweet-smelling ester, is called:Read the answer and worked solution →The addition of hydrogen to an unsaturated hydrocarbon to form a saturated one uses a catalyst of: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 →

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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