Difficult
On addition of $1 \, mL$ of $10 \% \, NaCl$ solution to $10 \, mL$ gold sol in the presence of $0.025 \, g$ of starch,the coagulation is just prevented. The gold number of starch is:
- A$2.5$
- B$25$
- C$0.25$
- D$0.025$
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View SolutionConsider the following statements:
Statement-$I$ : Gold sol is prepared by Bredig's arc method.
Statement-$II$ : Bredig's arc method involves both dispersion and condensation.
Statement-$I$ : Gold sol is prepared by Bredig's arc method.
Statement-$II$ : Bredig's arc method involves both dispersion and condensation.
Match List-$I$ with List-$II$:
List-$I$ List-$II$ $a$. Cheese $i$. dispersion of liquid in liquid $b$. Pumice stone $ii$. dispersion of liquid in gas $c$. Hair cream $iii$. dispersion of gas in solid $d$. Cloud $iv$. dispersion of liquid in solid
Choose the most appropriate answer from the options given below:
| List-$I$ | List-$II$ |
|---|---|
| $a$. Cheese | $i$. dispersion of liquid in liquid |
| $b$. Pumice stone | $ii$. dispersion of liquid in gas |
| $c$. Hair cream | $iii$. dispersion of gas in solid |
| $d$. Cloud | $iv$. dispersion of liquid in solid |
Choose the most appropriate answer from the options given below:
DifficultJEE MAIN 2021
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