Download App

PART - 1 CH - 1 Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 1 Some Basic Concepts of Chemistry3 Marks
✓

Answer

(a) Taking a fixed mass of dinitrogen, say 28 gm , the mass of dioxygen that reacts with it to form oxide is $32,64,32$ and 80 respectively, whose simple ratio is $2: 4: 2: 5$ which is a simple integer ratio. Therefore, these data are in accordance with law of multiple proportion.
(b) (i) $\begin{aligned} 1 km=1 km \times \frac{1000 m}{1 km} \times \frac{100 cm}{1 m} & \times \frac{10 mm}{1 cm} \\ & =10^6 mm\end{aligned}$
$\begin{array}{l}1 km=1 km \times \frac{1000 m}{1 km} \times \frac{1 pm }{10^{-12} m}=10^{15} Pm \\ \text { Hence } 1 km=10^6 mm=10^{15} pm \end{array}$
(ii) $1 mg =\frac{1 mg \times 1 g}{1000 mg } \times \frac{1 kg}{1000 g}=10^{-6} kg$
$\begin{array}{l}1 mg =1 mg \times \frac{1 g}{1000 mg } \times \frac{1 ng }{10^{-9} g}=10^6 ng \\ \text { Hence } 1 mg =10^{-6} kg=10^6 ng \end{array}$
$\begin{array}{l}\text { (iii) } 1 mL=1 mL \times \frac{1 L}{1000 mL}=10^{-3} L \\ 1 mL=1 cm^3=1 cm^3 \times \frac{1 dm }{10 cm} \times \frac{1 dm }{10 cm} \\ \times \frac{1 dm }{10 cm}=10^{-3} dm ^3 \\ \text { Hence } 1 mL=10^{-3} L=10^{-3} dm ^3\end{array}$

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 PART - 1 CH - 1 Some Basic Concepts of Chemistry→PART - 1 CH - 1 Some Basic Concepts of Chemistry — all question types→Chemistry STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Write down the outermost electronic configuration of alkali metals. How will you justify their placement in group 1 of the periodic table?
→
The increasing order of reactivity among group 1 elements is $Li < Na < K < Rb < Cs$ whereas that among group 17 elements is $F > Cl > Br > I$. Explain.
→
What is the energy in joules, required to shift the electron of the hydrogen atom from the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of the light emitted when the electron returns to the ground state? The ground state electron energy is – 2.18 × 10-11 erg.
→
Consider the following structure:
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ {\text{O}}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \|\\\ ^1\text{C}_3-\ ^2\text{CH}_2-\ ^3\text{C}-\ ^4\text{C}_2-\ ^5\text{C}\equiv\ ^6\text{CH}$
  1. How many σ and π-bonds are present in this compound?
  2. Arrange carbon no. 2, 3, 5 in decreasing order of s-character.
  3. Which atoms have same hybrid state?
→
  1. Which pair of element show similar properties with following atomic number?

[13, 31], [11, 21]

  1. Which of the following elements has most positive electron gain enthalpy?

F, N and Ne

  1. Lithium shows diagonal relationship with which element and why?
→
How many neutrons and protons are there in the following nuclei?
$\text{ }^{13}_{06}\text{C},\text{ }^{16}_{08}\text{O},\text{ }^{24}_{12}\text{Mg},\text{ }^{56}_{26}\text{Fe},\text{ }^{88}_{38}\text{Sr}$
→
In each of the following pairs of compounds, which one is more covalent and why?
  1. AgCl, Agl
  2. BeCl2, MgCl2
  3. SnCl2, SnCl4
  4. CuO, CuS
→
How many atoms are present in 1ml of NH3 at STP?
→
Write four characteristic properties of p-block elements.
→
Which method can be used to find out the strength of reductant/oxidant in a solution? Explain with an example.
→