Download App

MODEL PAPER 7 — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryMODEL PAPER 73 Marks
Question
What do you understand by the term 'conductance'? What are its units?
✓

Answer

The reciprocal of electrical resistance is called conductance. It is usually represented by 'G'.
Thus $G=\frac{1}{R}$
Units: The units of conductance are reciprocal ohms written as
ohm ${ }^{-1}$ or mho
or siemens (S)
$
1 S=1 \Omega^{-1}
$

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 MODEL PAPER 7→MODEL PAPER 7 — all question types→Chemistry STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Do the following conversions in not more than two steps:
  1. Benzoic acid to benzaldehyde.
  2. Ethylbenzene to Benzoic acid.
  3. Propanone to Propene.
→
What are emulsions? What are their different types? Give one example of each type.
→
What are alloys? Name an important alloy which contains some of the lanthanoid metals. Mention its uses.
→
Calculate the standard free energy change for the following reaction at $25°C$.
$\text{Au(s) + Ca}^{2+}(1\text{M})\xrightarrow{ \ \ \ \ \ \ \ }\text{Au}^{3+}(1\text{m) + Ca(s)}$
$\text{E}^{\circ}_{\text{Au}^{3+}/\text{Au}}=+1.50\text{V},=\text{E}^{\circ}_{\text{Ca}^{2+}/\text{Ca}}-2.87\text{V}$
Predict whether the reaction will be spontaneous or not at $25°C$. Which of the above two half cells will act as an oxidising agent and which one will be a reducing agent?
→
A crystalline solid has a cubic structure in which tungsten $(W)$ atoms are located at cube corners of the unit cell, oxygen atoms at the cube edges and sodium atom at the centre. What is the molecular formula of the compound?
→
In a reaction between A and B, the initial rate of reaction $(r_0)$ was measured for different initial concentrations of A and B as given below:
$A/mol L^{-1}$ $0.20$ $0.20$ $0.40$
$B/mol L^{-1}$ $0.30$ $0.10$ $0.05$
$r_0/mol L^{-1} s^{-1}$ $5.07 \times 10^{-5}$ $5.07 \times 10^{-5}$ $1.43 \times 10^{-4}$
What is the order of the reaction with respect to $A$ and $B$?
→
Define the following and give one example of each:
  1. Tranquillizers.
  2. Mordant.
  3. Hybrid rocket propellants.
→
  1. Explain the following giving suitable examples:
  1. Sandmeyer’s reaction.
  2. Coupling reaction of a diazonium salt.
  1. Explain the observed $K_b$ order:
$Et_2NH>Et_3N>EtNH_2$ in aqueous solution.
→
Give reasons:
a. $E ^{\circ}$ value for $Mn ^{3+} / Mn ^{2+}$ couple is much more positive than that for $Fe ^{3+} / Fe ^{2+}$.
b. Iron has higher enthalpy of atomization than that of copper.
c. $Sc ^{3+}$ is colourless in aqueous solution whereas $Ti ^{3+}$ is coloured.
→
Write IUPAC names of the following coordination compounds:
i. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$
ii. $\left[\mathrm{Co}\left(\mathrm{NH}_3\right) 5 \mathrm{Cl}^2 \mathrm{Cl}_2\right.$
iii. $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
→