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Lead enters the atmosphere as a particulate pollutant. This is a problem because it ________.

Identify the $M{g}^{2+}$ ion from the figure where $n$ and $p$ represent the number of neutrons and protons respectively.

1. 250

Which of the following gas is not greenhouse gas ?

Which of these is not an advantage of hydel power generation?

Deepti wanted to dissolve more sugar to an already saturated solution of sugar in a bottle. What can she do to add more sugar to it?

(a)

Write equations for the reactions of ​

(i) iron with steam.



(b)

(ii) calcium and potassium with water.

Give reasons.

(i) Environmental aspects must be carefully looked into before building huge dams.

(ii) Most industries are concentrated around coal mines.

(iii) Petroleum is referred to as “black gold”.

(iv) Quarrying can become a major environmental concern.

The variable coefficients a, b, c and d are considered for balancing the chemical equation.

The relation we get by balancing K in the following equation is:

If a living thing dies then what happens of the atoms inside the body

The random or zig-zag motion of the colloidal particles in the dispersion medium is referred to as:

Which among the following methods is most suitable for the separation of two miscible liquids?

On a winter night Nishant burnt some wood in his closed room and slept. He started feeling very suffocated in the mid night and ran to open the doors. After moving outside he was relieved. What is the reason behind this?

PVC is obtained by polymerization of

Match the column
Directions: Match Column – I with Column – II and select the correct answer using the codes given below the columns

$\begin{array}{cc}Column-I& Column-II\\ \text{A. Hottest zone of candle flame}& \text{P. No combustion zone}\\ \text{B. Dark zone of candle flame}& \text{Q. Zone of unburnt wax vapours}\\ \text{C. Yellow zone of candle flame}& \text{R. Non-luminious zone}\\ \text{D. Black innermost zone of candle flame}& \text{S. Incomplete combustion zone}\end{array}$

Sulphur dioxide is dissolved in water. The solution is tested for acidic nature. What are the changes you will observe when you dip a litmus paper in the solution?

Which plastic is used in the non- stick pan shown in the picture below?

Which of the following represents the correct match for items in Column A with those in Column B.
$$\begin{array}{cc}\text{Column A}& \text{Column B}\\ \text{I. Nylon}& \text{(i) Thermoplastic}\\ \text{II. PVC}& \text{(ii) Thermosetting plastic}\\ \text{III. Bakelite}& \text{(ii) Fiber}\end{array}$$

Which of the following do you think is/are solution(s)?

Question 6

Explain the difference between thermoplastic and thermosetting plastics.

By which process is a brass article coated with tin?

Aluminium finds its use in:

How coal is formed?

Name two metals which are soft and can be easily cut with a knife.

Which of the following is not obtained as a fraction during the refining of petroleum ?

(a) kerosene

(b) natural gas

(c) lubricating oil

(d) bitumen