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Chemistry — Questions with Solutions

7 solved Chemistry questions from General Awareness, as asked in SSC CGL and other SSC exams. Read the answer and explanation below, then practise the full set in the practice section.

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Q1. In which musical note did Newland put the metals Co and Ni with halogens?

न्यूलैंड ने किन संगीत सुरों के तहत हैलोजेन के साथ Co (कोबाल्ट) और Ni (निकल) धातुओं को रखा था?

  1. A. Fa
  2. B. Do
  3. C. Re
  4. D. Mi

Solution

In Newlands' Law of Octaves, Cobalt and Nickel were placed in the same column as Fluorine, Chlorine, etc., under the musical note 'Do' (Sa in Indian music).

Q2. The decomposition of gaseous Ammonia on a hot platinum surface is a _____ order reaction at high pressure.

गर्म प्लैटिनम सतह पर गैसीय अमोनिया का अपघटन उच्च दबाव पर एक _____ कोटि (order) की प्रतिक्रिया है।

  1. A. two
  2. B. zero
  3. C. three
  4. D. one

Solution

At high pressures, the metal surface becomes completely saturated with gas molecules, making the reaction rate independent of pressure (Zero Order).

Q3. Which of the following is a correct order of basicity?

  1. A. LiOH>NaOH>KOH>CsOH
  2. B. LiOH>KOH>CsOH>NaOH
  3. C. KOH>CsOH>NaOH>LiOH
  4. D. CsOH>KOH>NaOH>LiOH

Solution

Basicity of alkali metal hydroxides increases down the group due to the decrease in ionization energy. Thus, CsOH > KOH > NaOH > LiOH.

Q4. Which of the following decomposition reactions is NOT a redox reaction?

  1. A. Decomposition of dihydrogen monoxide
  2. B. Decomposition of sodium hydride
  3. C. Decomposition of potassium chlorate
  4. D. Decomposition of calcium carbonate

Solution

The decomposition of calcium carbonate (CaCO3 -> CaO + CO2) involves no change in oxidation states, hence it is not a redox reaction.

Q5. Which of the following is a straight-chain alkyl carboxylic acid with the chemical formula $CH_3CH_2CH_2CO_2H$?

रासायनिक सूत्र $CH_3CH_2CH_2CO_2H$ के साथ एक सीधी-श्रृंखला एल्काइल कार्बोक्जिलिक एसिड निम्नलिखित में से कौन सा है?

  1. A. Methanoic acid
  2. B. Propionic acid
  3. C. Ethanoic acid
  4. D. Butyric acid

Solution

Butyric acid has a $4$-carbon straight chain with the formula $CH_3CH_2CH_2COOH$.

Q6. What is the IUPAC name of tertiarybutyl alcohol?

  1. A. 2-Methylpropan-2-ol
  2. B. 1-propylpropan-3-ol
  3. C. 1-Methylpropan-3-ol
  4. D. 1-ethylpropan-3-ol

Solution

The IUPAC name for tertiary-butyl alcohol (tert-butanol) is 2-Methylpropan-2-ol, representing a propanol chain with a methyl group and an OH group both on the central carbon.

Q7. When electricity is passed through water, what kind of chemical reaction occurs?

  1. A. Decomposition
  2. B. Displacement
  3. C. Double displacement
  4. D. Combination

Solution

Passing electricity through water causes electrolysis, which breaks down water (H2O) into hydrogen and oxygen gases. This is a decomposition reaction.