Download App

Chemistry in Everyday Life — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryChemistry in Everyday Life3 Marks
Question
Define the following terms :
  1. Antiseptic
  2. Cationic detergent
  3. Broad spectrum antibiotic
✓

Answer

  1. Antiseptics are the chemicals which either kill or prevent growth of microbes on living tissues.
  2. Cationic detergents are quarternary ammonium salts of amines with acetates, chlorides or bromides as anions/detergents whose cationic part is involved in cleansing action.
  3. Antibiotics which kill or inhibit a wide range of Gram-positive and Gram-negative bacteria.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Chemistry in Everyday Life→Chemistry in Everyday Life — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Write the Nernst equation and emf of the following cells at $298\ K:$
$Pt(s) | Br_2(l) | Br^– (0.010 M) || H^+ (0.030 M) | H_2(g) (1 bar)|Pt(s).$
→
In a pseudo first order hydrolysis of ester in water, the following results were obtained:
t/s $0$ $30$ $60$ $90$
[Ester]/mol $L^{-1}$ $0.55$ $0.31$ $0.17$ $0.085$
  1. Calculate the average rate of reaction between the time interval $30 $to $60 $seconds.
  2. Calculate the pseudo first order rate constant for the hydrolysis of ester.
→
How would you account for the following:
There is a gradual decrease in the atomic sizes of transition elements in a series with increasing atomic numbers.
→
An organic compound (A) has characteristic odour. On treatment with NaOH, it forms compounds (B) and (C). Compound (B) has molecular formula $C_7H_8O$ which on oxidation gives back (A). The compound (C) is a sodium salt of an acid. When (C) is treated with soda-lime, it yields an aromatic compound (D). Deduce the structures of (A), (B), (C) and (D). Write the sequence of reactions involved.
→
Explain vapour pressure of solutions of solids in liquids.
→
Give reasons:
  1. Acetylation of aniline reduces its activation effect.
  2. $CH_3NH_2$ is more basic than $C_6H_5NH_2.$
  3. Although $–NH_2$ is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.
→
Various isomeric haloalkanes with the general formula $C_4H_9CI$ undergo hydrolysis reaction. Among them, compound $"A\ "$ is the most reactive through $S_N^1 $ mechanism. Identify $"A\ "$ citing the reason for your choice. Write the mechanism for the reaction.
→
Write chemical equations for the following conversions:
  1. Nitrobenzene to benzoic acid.
  2. Benzyl chloride to 2-phenylethanamine.
  3. Aniline to benzyl alcohol.
→
Write the names and structures of the monomers of the following polymers :
  1. Bakelite
  2. PVC
  3. Buna-S
→
Determine the amount of $CaCl_2 (i = 2.47)$ dissolved in $2.5$ litre of water such that its osmotic pressure is $0.75$ atm at $27^\circ C.$
→