Chemistry – Test 8

The bonding between the nitrogenous bases of one strand with another strand of DNA is done by

Which one of the following is not responsible for the Global Warming?

Consider the following statements

I. Probability of finding the electrons in the bonding molecular orbital is more than combining atomic orbitals.

II. Bonding molecular orbitals are formed when the different signs of orbitals are overlapped.

Which of the statements given above is/are correct?

Which one of the following is an element?

Consider the following statements

I. Fuel with low octane numbers are ideal for diesel engines.

II. Use of gasoline with low octane numbers may lead to the problem of engine knocking.

Which of the statements given above is/are correct?

Which one of the following is not responsible for the Global Warming?

Which one of the following is correct?

Setting of plaster of paris is

The animal fats undergo ‘auto-oxidation’ under ordinary temperature which gives the fats a rancid taste and odour. Which one of the following causes the rancid taste and odour of the fats?

The synthetic rubber has replaces natural rubber for domestic and industrial purposes. Which one of the following is the main reason behind that?

When the fats are related with alkali, they form ‘soaps’. The type of reaction taking place in formation of soaps is called

Consider the following statements

I. Jet fuel is a mixture of a large number of different hydrocarbons.

II. Kerosene-type jet fuel (Jet A and jet A-1)has a carbon number between 8 and 16.

III. Naphtha-type jet fuel (including Jet B), has carbon numbers between 5 and 15.

Which of the given statements given above is/are correct?

Red phosphorus is used in the manufacturing of safety matches. This is due to the fact that

Which one of the following gases in the atmosphere is/are responsible for acid rains?

I. Oxides of sulphur

II. Oxides of nitrogen

III. Oxides of carbon

Select the correct answer using the codes given below

Which one of the following chemicals released along with domestic wastes has caused the phenomenon of ‘Eutrophication’ which leads to high productivity of water bodies?

Which one among the following when dissolved in water gives hissing sound?

Which one of the following statements are not correct?

Which one of the following reactions is responsible for the transformation of inexpensive liquid vegetable fats into commercially important solid fats (e.g. ghee)?

Consider the following statements

I. CFLs have a life expectancy of 10000 hrs if used 3 hrs per day.

II. CFLs help in reducing Global Warming.

III. CFLs contain mercury which is very harmful to living beings.

IV. CFLs should be disposed of properly and recycled.

Which of the statements given above are correct?

with reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements

I. If pure hydrogen is used as a fuel,the fuel cell emits heat and water as by products.

II. Fuel cells can be used for powering buildings and not for small devices like laptops computers.

III. fuel cells produce electricity in the form Alternating Current (AC).

Which of the statements given above is/are correct?

Which chemical was an important symbol in our struggle for freedom?

Why is the meat preserved in the brine solution is not spoil as quickly as fresh meat?

Which one of the following is the major component of the ‘photochemical smog’?

Nail polish remover contains

Which one of the following is the important ore of magnesium?

Colligative properties are properties of solution that depend on