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Question 26
Why is it advised that industries should switch over to cleaner fuels such as CNG and LPG in the TajMahal Zone in Agra?

If rayon is made from cellulose of wood pulp which is a natural substance then why is it known as a synthetic fibre?

We use an atom of _______ as the standard particle for comparing the masses of atoms of other elements.

You may have seen that when a person accidentally catches fire, people put a blanket around him. Identify the reason for this.

A basic oxide will be formed by the element :

(a) sulphur

(b) phosphorus

(c) potassium

(d) carbon

Identify the element(s) that are liquid at room temperature and pressure.

Water pollution can be potentially harmful to aquatic life. What are the various sources of water pollution?

On the banks of river Ganga we have found people throwing garbage, bathing, washing and polluting the water. What are the measures you can take to prevent the river from further damage?

A ball of mass 200g falls from a height of 5m. What is its kinetic energy when it just reaches the ground. (Take $g=9.8m{s}^{-2}$ )

What is the correct chemical formula for sodium oxide?

Which of the following elements has its symbol given in the correct manner?

We studied in our earlier classes:

Anything that occupies space and has mass is called matter.

However light doesn't occupies space and do not have mass. Then why is it called Matter?

What best can be inferred about the matter through the following scenario?
'You often face difficulty when you walk during air storm.'

Ground water does not get polluted by:

Which metal foil was used by Rutherford in the alpha ray scattering experiment?

Sodium is represented by:

Which of the following generates most of the sewage?

Being a responsible citizen, we have to develop habits that are environment-friendly. What is the 4R principle we all should follow?

Explain why, plastic containers are preferred for storing food.

The similarity between artificial silk and cotton is that :

(a) both are non-biodegradable (b) both melt on heating

(c) both are amide polymers (d) both are cellulose polymers

In which of the following cases do iron rust?

The energy possessed by a body due to its position or configuration is called ___ energy.

How Does baking soda able to control fire ?

Which of the following are the properties of a chemical change?

Why do people buy polyfill pillows instead of cotton pillows?

Based on the activity series, which of the following can be extracted by electrolysis?

Adding sugar to water is a __ change.

Explain how, the use of CNG in automobiles has reduced pollution in cities.

How will you distinguish between fire extinguishing action of water and $C{O}_2$? [3 MARKS]

Soda acid fire extinguishers contains :a) sodium carbonate

B) sodium hydrogen carbonate ,sulphuric acid

C) sodium carbonate, hydrochloric acid

D )sodium hydrogen carbonate, hydrochloric acid

When Soduim carbonate solution is added to magnesuim sulpahte solution,the following reaction takes place :

${\text{MgSO}}_2+{\text{Na}}_2{\text{CO}}_3\to {\text{MgCO}}_3+{\text{Na}}_2{\text{SO}}_4$

The reactant(s) in the reaction is/are:

Name the component of air that has maximum solubility in water.

Consider the following elements :Sodium,Sulphur,Carbon,Magnesium

Which of these elements will form :(a) acidic oxides ? (b) basic oxides ?

Explain the corrosion of metals

You entered the kitchen to prepare tea for yourself. On seeing you wearing synthetic clothes, your mother drove you out of the kitchen and asked you to change and come back. Think of the possible reason for your mother to react in such a manner.

The valency of carbon is 4 and that of oxygen is 2. What is the molecular formula of carbon dioxide?

For a first order reaction A ⟶ P, the temperature (T) dependent rate constant (k) was found to follow the equation log k = -2000(1/T) + 6.0. The pre-exponential factor A and the activation energy $E_a,$ respectively, are

(IIT-JEE, 2009)

In the traditional way of filtration we use 3 pots with charcoal at the top most pot, gravel at the second pot and sand at the third pot. but in place of charcoal and gravel if we use sand will iit be a better idea?why?

The process of separating the various constituents/fractions of petroleum is known as

A reaction in which heat is absorbed is called as an ___ reaction