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Andhra Pradesh SSC (Class 10) Sound — practice questions

Explore 11 free Sound 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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Sound questions and exercises with answers

Showing questions 1–11 of 11.

How many isomers exist for the molecular formula C4H10?Read the answer and worked solution →Soap molecules in water form micelles because:Read the answer and worked solution →Which alkane is added to LPG to make it detectable through smell?Read the answer and worked solution →Sodium carbonate is a basic salt because it is a salt ofRead the answer and worked solution →Which of the following is used for dissolution of gold?Read the answer and worked solution →Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example ofRead the answer and worked solution →Structural formula of ethyne isRead the answer and worked solution →Identify the unsaturated compounds from the following (i) Propane (ii) Propene (iii) Propyne (iv) ChloropropaneRead the answer and worked solution →Chlorine reacts with saturated hydrocarbons at room temperature in theRead the answer and worked solution →Vinegar is a solution ofRead the answer and worked solution →The correct electron dot structure of a water molecule isRead the answer and worked solution →

Worked practice questions

How many isomers exist for the molecular formula C4H10?

  1. One
  2. Three
  3. Two
  4. Four
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Correct answer: C. Two

1. C4H10 corresponds to butane with the alkane formula CnH(2n+2). 2. The straight-chain version is n-butane (CH3-CH2-CH2-CH3). 3. A branched version has a methyl on the central carbon, called isobutane. 4. Both share the same molecular formula but differ in structure. 5. So C4H10 has exactly two structural isomers. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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Soap molecules in water form micelles because:

  1. Their entire body is hydrophobic under typical conditions
  2. They have a hydrophilic head and a hydrophobic tail
  3. Water expels them in general usage
  4. They have ionic chains throughout
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Correct answer: B. They have a hydrophilic head and a hydrophobic tail

1. Soap molecules have two distinct ends. 2. The hydrocarbon tail is non-polar (hydrophobic). 3. The carboxylate head is polar and ionic (hydrophilic). 4. In water, tails huddle together and heads face outward. 5. The resulting spherical clusters are called micelles. 6. Micelles trap oil droplets inside the tail cluster, enabling cleaning. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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Which alkane is added to LPG to make it detectable through smell?

  1. Methane
  2. Ethanethiol or mercaptan
  3. Propane
  4. Butane in the standard view
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Correct answer: B. Ethanethiol or mercaptan

1. Pure LPG is mostly butane and propane and is odourless. 2. To detect leaks, a strong-smelling sulphur compound is added. 3. Ethanethiol (ethyl mercaptan, C2H5SH) is the standard odorant used. 4. Even tiny amounts give a sharp smell that warns of leaks. 5. Hence ethanethiol is the odorant added to LPG. _Source: syllabus Science Ch 4 'Carbon and its Compounds' (byjus.com extract)_

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