Explore topic-wise InterviewSolutions in .

The switch boards around you for switching on the lights, fans, ac and so on are made up of Bakelite, why?

Consider the following statements about UJALA (Unnat Jyoti by Affordable LEDs for all) scheme:

Which of the above statements is/are correct?

Describe the movement of particles when the kinetic energy of solid liquid and gas increases or decreases?

A solution contains 50 g of common salt in 400 g of water. Calculate the concentration by mass percentage of the solution.

Q20. Consider the following statements:

1. State of Global Air Report is published by UNEP.

2. Air pollution was the fourth-highest cause of death among all health risks globally.

Which of the above statements are correct?

What is the purpose of using Cryolite during electrolytic refining of Alumina?

Explain sublimation and deposition on the basis of kinetic theory

Explain how petroleum is formed with the help of a diagram. [5 MARKS]

Hydrogen acts as a reducing agent by taking:-

Which species has the highest water content:

Particles of matter are in constant motion so they possess ___ energy.

Why non metals or non sonorous non malleable and non lustorous in mature?

Question 2
Explain why Rayon is different from synthetic fibres ?

Rust is iron oxide.Will it be acidic or basic?

Why?

The fats and oils present in food are oxidized resulting to the spoilage of food. This phenomenon is called ________.

Let B = {1 orange, 1 pinapple, 1 banana, 1 apple}

Let U = {1 orange, 1 apricot, 1 pineapple, 1 banana, 1 mango, 1 apple, 1 kiwifruit}

B’ =

100 g of calcium carbonate on treatment with 73g of hydrochloric acid, produces carbon dioxide. What is the volume of carbon dioxide gas produced when the reaction is taking place at STP?

Name the units of which cellulose polymer is made.

Reaction of water on non metals

(a) What is air? Write the names of various constituents of air.

(b) What is air pollution? What are the main sources of air pollution?

Observing the changes, in which of the following would you say a chemical reaction may be occurring?
(i) Heating iodine changes the colour from bluish black to purple
(ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance
(iii) Mixing an acid and a base solution raises the temperature.
(iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell

Match the following

$$\begin{array}{ccc}\text{S.No}& \text{Column I}& \text{Column II}\\ a)& a& \text{(i) Activation energy of forward reaction}\\ b)& b& \text{(ii) Change in enthalpy}\\ c)& c& \text{(iii) Activation energy of backward reaction}\\ d)& d& \text{(iv) Potential Energy of Reactants}\\ e)& e& \text{(v) Potential energy of Products}\end{array}$$

Which of the following fibre was first used commercially for women's stockings?

Three liquids are taken: mercury, water and oil. If all are put in the same container, then what is the order in which they form layers starting from bottom?

What is the importance of chemical formula?

which compound formed by ammonia is used in explosives and fertilisers

Ram has a cotton shirt and a shirt made from synthetic material. Which shirt is suitable for summers? Explain. [3 MARKS]

Let us dive into the land of Westeros!

When the dragons of Danaerys the dragon queen burn their victims, the following reaction takes place:

$2C+O_2⟶2C{O}_2$

The average rate of reaction could be expressed as?

What is/are the statements of Rutherford's Atomic model?

Choose the chemical equation for the reaction of magnesium metal with hydrochloric acid.

Explain with an experiment that the melting of wax is a physical change.Observe the changes around you and make a list of these changes and categories them into physical and chemical change.(At least 10 for each)

State the type of the underlined phrase.

Robert burnt and injured his little finger.

The inside surface of a solar cooker is painted ____.

The formula of a compound having its constituent as X and Y is $X_2{Y}_3$. If the element will form its chloride then what will be the formula of the compound?

Choose the correct option regarding uses of washing soda:

Our ecosystem is getting endangered, the survival of our very earth is becoming a big question so as a responsible citizen, what should be our work to save our mother nature?

A zinc plate was put into a solution of copper sulphate kept in a glass tumbler. It was found that a blue colour of the solution gets fader and fader with the passage of time . After a few days when zinc plate was taken out, a no. of holes were found .

(i) state the reason for the change in the plate

What happen when copper sulphate crystals are heated in a test tube?

Statements:
i. It loses its water of crystallization
ii. White coloured powder is formed
Select the correct options for both statements.

Two paths lead to the top of a hill. One is shorter and steeper and the second one is longer but less steep. For which of the two paths is the gain in potential energy more?

The number of electrons present in K, L, M shell respectively is:

Which of the following energy conversions can take place during a chemical reaction?