Explore topic-wise InterviewSolutions in .

Which of the following plastics do not have cross-links between their polymer chains?

A. Nylon B. Melamine C. Terylene D. Bakelite

(a) A and B (b) B and C (c) A and C (d) C and D

As potassium is so reactive that it reacts vigorously with water or catches fire. Than how it can be used as a fertilizer for plants as it is added to the soil does it not reacts with water used for irrigation of plants it must catch fire there also .

The rapid oxidation of a material to give off energy in the form of heat and light is known as -

Which of the following is the pollutant source for the condition shown in the picture?

Which metal is less reactive : copper or iron ?

Which property of oxygen is demonstrated in the splint test?

Select a basic oxide.

Which substances do not change their state ?

Which of the following reason restricts the use of gaseous hydrogen as a fuel?

According to Maharshi Kannada, which is the smallest particle?

The coolest part of a candle flame is _______ in colour.

Match the following:

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

Which of the following is the most environment friendly fuel to be used in automobiles?

(a) petrol

(b) diesel

(c) natural gas

(d) petroleum gas

A body is moving in the direction opposite to the force acting on it. The work done here is:

3 R's means

In the following reaction, how is the rate of appearance of product related to the rate of disappearance of the reactant?
$Br{O}_3^{-}\left(aq\right)+5B{r}^{-1}\left(aq\right)+6H^{+}\to 3B{r}_2\left(l\right)+2H_{2}O\left(l\right)$

Match the physical state of elements or compounds to their symbols as used while writing chemical equations:

$\begin{array}{cc}\text{Physical State}& \text{Symbol}\\ \text{1. Gas}& \text{(A) (s)}\\ \text{2. Solid}& \text{(B) (g)}\\ \text{3. Liquid}& \text{(C) (aq)}\\ \text{4. Dissolved in water}\text{(solution with water)}& \text{(D) (l)}\end{array}$

Choose the incorrect statement.

Which of the following is not a characteristic property of iron ?

(a) malleability

(b) brittleness

(c) ductility

(d) sonorousness

A student purchases common salt from the market which contains ammonium chloride (${NH}_{4}Cl$ ) in it. Identify the technique that he should adopt to obtain pure $NaCl$.

How is plaster of paris obtained ? What reaction is involved in the setting of a paste of plaster of paris? What is it used for? [3 MARKS]

Name the non-metal which is essential for maintaining life and inhaled during breathing.

As we know that tungsten is not good conductor of heat and electricity so why it is used in electric bulbs

Distilled water is ___.

Differentiate the the three states of matter in terms of movement of particles.

Differentiate between complete and incomplete combustion. [3 MARKS]

Which of the following reactions are exothermic in nature?

(i) Evaporation of water
(ii) Dissolution of sodium hydroxide in water
(iii) Dilution of sulphuric acid
(iv) Dissolution of ammonium chloride in water
(v) Combustion of methane gas

According to Maharishi Kannada, which of the following does not exist in free state ?

When nitric acid reacts with metals, hydrogen gas is not observed because:

What are the characteristics of nylon,rayon, polyester,acrylic?

A copper coin is immersed in a solution of silver nitrate for some time. What will happen to the coin and colour of the solution?

Differentiate between :

(a) Reactants and products.

(b) A balanced and an unnbalanced chemical equation.

What is the full form of UC?

The correct representation of the chemical formula of common salt is

Many fabrics are made by mixing two fibers. So ponder what is Poly wool made up of?

The picture below shows two cases in which a person is trying to burn the paper cup. In case 1, the cup has water in it and in case 2, it is empty and dry. Identify in which of the cases the paper will burn.

Which of the following are examples of chemical reactions?

i. Burning of wood

ii. Cutting of wood

iii. Conversion of steam to water

iv. Rusting of almirah

Should the handle and bristles of a toothbrush be made of the same type of plastic material ? Explain your answer.

The material A is a fossil fuel which is extracted from the earth. It is said to be formed from the buried large land plants by a very slow process B. When A is heated in the absence of air in a process called C then it gives three products, D, E and F. The product D is used as a reducing agent in the extraction of metals, the product E is used as and industrial fuel whereas the product F has been traditionally used for metalling the roads.

(a) What could material A be ?

(b) What is (i) physical state, and (ii) colour, of A ?

(c) Name the processes (i) B, and (ii) C.

(d) What are (i) D, (ii) E, and (iii) F ?

The fossil fuel P is formed under the earth by the decomposition of vegetable matter lying under water by the action of anaerobic bacteria. The major component of fuel P is Q. The fossil fuel P is used as a source of gas R needed to manufacture nitrogenous fertilisers. When P is filled in metal cylinders and used as a fuel in motor vehicles, it is called S. What are P, Q, R and S ?

Which of the following is the correct electronic configuration of a Sodium atom?

Which of the following is an example of fossil fuel?

Lampblack is used in :