Explore topic-wise InterviewSolutions in .

Discuss the environmental concerns of increased demand for energy. [5 MARKS]

(a) What are fuels ? Name any two common fuels.

(b) State any four characteristics of an ideal fuel (or good fuel).

The metal(s) that can be found in free state in nature is/are _______.

What are the raw materials used in manufacturing cement?

Plastics are used in:

If we suspend a weight using a spring, it stretches.

What kind of changes are involved in this?

Metals that are soft and can be cut with a knife are:

Which of the following is used in non - stick cookware coating?

Hydrogen is readily adsorbed by _______ at room temperature.

Explain the uses of coal tar. [3 MARKS]

Atomic mass of an element is equal to the total number of __________ present in an atom of that element.

Match the following:

$$\begin{array}{cccc}\left(i\right)& Water& \left(A\right)& Compound\\ \left(ii\right)& Hydrogen& \left(B\right)& Element\\ \left(iii\right)& Salt& & \\ \left(iv\right)& Gold& & \\ \left(v\right)& Carbondioxide& & \\ \left(vi\right)& Iron& & \end{array}$$
The correct pairs are:-

What will be the product for the reaction given below?

KCl + Na $\Rightarrow$

__ is the slow rise in the earth's temperature.

Which group of animals does not give us a food product?

Identify the labels in the given flow diagram which links the major nitrogen pools. Choose the correct combination from the options given below

Find the mass ratio of carbon to oxygen in carbon dioxide?

Any chemical element (X) can be represented as ${}_Z{X}^A$ where ‘Z’ is the atomic number and ‘A’ is the mass number. The atomic number refers to the number of protons and the mass number refers to the sum of protons and neutrons in an atom. For an element, calcium which has 20 protons and 20 neutrons, identify the correct representation:

How many electrons are present in M shell?

Consider the following reaction.

$Cu(N{O}_3{)}_2\to CuO+N{O}_2+O_2$ Which of the following statement is correct?

Identify X in the following reaction:

${\text{Ca(OH)}}_2\text{(aq)}+2\text{X}$ $\to$ ${\text{CaCl}}_2\text{(aq)}+2{\text{H}}_2\text{O}\text{(l)}$

Sodium is stored in kerosene because:

Identify the foul practice(s) by which we have been damaging the Ganga river.

The molecular mass of water is ___.

Match the entries of column I with column II.
$$\begin{array}{cc}\text{Column A}& \text{Column B}\\ \text{(a) Semi-synthetic fibre}& \text{(i) Cellulose}\\ \text{(b) Elastomer}& \text{(ii) Nylon}\\ \text{(c) Synthetic Fibre}& \text{(iii) Rayon}\\ \text{(d) Biopolymer}& \text{(iv) Rubber}\end{array}$$

Acid rain can affect

Match the entries to the correct type.

What are the various ways to save the environment from excessive plastic wastes ?

How is the fire produced by burning oil (or petrol) extinguished ?

(a) What happens when sulphur dioxide is dissolved in water ? Write a word equation for the reaction which takes place.

(b) What happens when an iron nail is placed in copper sulphate solution ? Write word equation of the reaction involved.

Name the gas involved when metals react with dilute acid

Which metal is found in table salt?

On a cold winter night, the persons sleeping in a room with closed door and windows with a coal fire burning inside may die due to the excessive accumulation of :

(a) nitrogen monoxide

(b) nitrogen dioxide

(c) carbon dioxide

(d) carbon monoxide

Which of the following is false about a gas stove burning with a blue flame?

Observe the table and identify metals and non-metals. Select the correct option.
$\begin{array}{ccc}\text{Sl.No}& \text{Set-1}& \text{Set-2}\\ \text{1.}& \text{Sodium(Na)}& \text{Oxygen(O)}\\ \text{2.}& \text{Magnesium(Mg)}& \text{Chlorine(Cl)}\\ \text{3.}& \text{Iron(Fe)}& \text{Helium(He)}\\ \text{4.}& \text{Gold(Au)}& \text{Sulphur(S)}\\ \text{5.}& \text{Calcium(Ca)}& \text{Carbon(C)}\end{array}$

The non-metal which occurs as a yellow powder is _____

Which of the following statement is true about convection?

The rate of diffusion of hydrogen and chlorine are in the ratio of 6:1. The density of chlorine as compared to that of hydrogen will be:

What will be the colour change when methyl orange is added to sodium hydroxide?

Which of the following is used in making gas masks/ filters used in coal mines?

Pollution levels in cities are increasing day after day. From the given options, select the fuel that can be recommended in place of petrol and diesel to reduce toxic emissions?

Which property of sand is used in extinguishing fires?

$\begin{array}{cccc}& \text{Solid to Liquid}& \text{Liquid to Gas}& \text{Gas to Solid}\\ \text{The distance between the particles}& \text{(1) Decreases}& \text{(2) Increases}& \text{(3) Decreases}\\ \text{Movement of particles}& \text{(4) Increases}& \text{(5) Decreases}& \text{(6) Increases}\\ \text{Attraction between particles}& \text{(7) Decreases}& \text{(8) Increases}& \text{(9) Increases}\end{array}$

Which of the following is/are incorrect?

Is coal a metal or non metal ?