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Define the term fire triangle along with the components?

Question 5

1. 
   

   Mention different types of coal.

   
   


2. 
   

   Anthracite is known as the highest grade coal. Give reason.

   
   

Write answers to the following questions.

(a) How are properties of substances determined?

(b) Explain the differences between compounds and mixtures.

(c) Why is an alloy a mixture?

(d) Why are substances classified?

In what properties of the constituents are retained?

Analyse the given diagram below and choose the correct option which shows the correct setup for the conventional method of purification of water.

Metalloids are best known for being___________.

At $298K$, the conductivity of a saturated solution of $AgCl$ in water is $2.6\times {10}^{-6}Sc{m}^{-1}$. Its solubility product at $298K$ is:



[Given :

${\lambda }^0\left(A{g}^{+}\right)=63.0Sc{m}^{2}mo{l}^{-1}$

${\lambda }^0\left(C{l}^{-}\right)=67.0Sc{m}^{2}mo{l}^{-1}$]

Classify the following changes into man-made and natural:

1. 
   

   Breaking of glass

   
   


2. 
   

   Volcanic eruptions

   
   


3. 
   

   Forest fires

   
   


4. 
   

   Earthquake

   
   


5. 
   

   Burning of paper
   
   

   
   

Write the molecular formula of carbon dioxide.

Find the energy of activation for the reaction who rate doubles when the temperature changes from ${30}^{o}C\text{to}{40}^{o}C$.

Nishant wants to present his friend a gift made of plant fibre. What should he choose as the gift?

Study the information given below:
1) Some substances are made up of two or more elements combined together chemically.
2) Properties of these substances are different from the elements that make them.
3) This substance cannot be broken down by physical methods.
Which of the following substance has the properties listed above?

Question 1

(a) Is Air said to be polluted when it is contaminated with unwanted or foreign substances?

(b) Mention one man-made activity that leads to air pollution.

In which of the following life stages of the silk moth is silk extracted?

The type of pollution which is likely to affect Taj Mahal in Agra to a greater extent is

Question 27

Think and suggest some ways to minimize waste and pollutants at their source, taking your home as an example.

Write the molecular formula of water.

A hydrogen electrode placed in a buffer solution of $C{H}_{3}COONa$ and acetic acid in the ratios $x:y$ and $y:x$ has oxidation potential values $E_{1}V$ and $E_{2}V$ respectively at ${25}^{\circ }C.$ The $p{K}_a$ value of acetic acid would be:

(Pressure of $H_2$ is $1atm$)

The energy associated with air is because:

Calculate the reduction potential for the following half cell at ${25}^{\circ }C$:

$Ag\left(s\right)|A{g}^{+}(aq,{10}^{-5}M);E_{A{g}^{+}/Ag}^0=-0.80V$

Paheli rooted a rose plant from the soil most of the root tips with root hair got left Behind in the soil she planted it in a pot with new cell and water it regularly will the plant grow or die give reason for your answer?

Write answer the following questions.

(a) When water is the largest resource, why can so little of it be used for drinking and agriculture?

(b) What is meant by ground water?

(c) What are the different forms in which we find water on the earth?

(d) How is salt obtained from sea water in salt pans?

Statement 1: It is comparatively easier to extract the metals that are present at top of the reactivity series than the metals present at the bottom of the reactivity series.
Statement 2: Metals at the top of the reactivity series are highly reactive in comparison with the metals at the bottom.