Chemistry English

Question. Which chemical law proposes that soft drinks and soda bottles are sealed under high pressure to increase the solubility of CO2?

Ans: Henry's law

Question. Which one of the following can be categorised as a solution?

Ans: Sea Water

Question. Which of the following is/ are used of Biogas?I. Fuel for cooking food,II. Used for lighting,III. As a fuel to run engines,IV. Used for generating electricityCorrect code is -

Ans: I, II, III and IV all

Question. Calcium sulphate dihydrate is commonly known as -

Ans: Gypsum

Question. Which one of the following is the major constituent of biogas?

Ans: Methane

Question. Which one of the following represents the correct order of electron releasing tendency of metals?

Ans: Zn>Cu>Ag

Question. A very large volume of hydrogen can be accommodated by making -

Ans: non-stoichiometric hydrides

Question. Which one of the following is termed as Dry ice?

Ans: Solid state of carbon dioxide

Question. Which one of the following substances is not a mixture?

Ans: Tin

Question. Soaps clean surfaces on the principle based on -

Ans: Surface tension

Question. Which one of the following does not represent the salt, Calcium carbonate?

Ans: Lime water

Question. A sample of soft soap contains -

Ans: Potassium

Question. Which one of the following statements about water is not true?

Ans: Water is a non-polar molecule

Question. Which one of the following compounds does not exhibit a different oxidation number of the same element?

Ans: Fe2O3

Question. The elements present in urea are -

Ans: C, H, N, O

Question. The numbers of sigma and pi bonds in benzene are -

Ans: 12, 3

Question. A mixture of sand and naphthalene can be separated by -

Ans: sublimation

Question. The pH of a solution changes from 3 to 6. The H+ ion concentration will -

Ans: decrease 1000 times

Question. The incomplete burning of petrol and diesel produces -

Ans: carbon monoxide

Question. Lime water is turned milky by -

Ans: CO2

Question. The breath test conducted by police to check drunken driver has which one of the following on the filter paper?

Ans: Potassium dichromate-sulfuric acid

Question. Consider the following statement :Atomic number of an element is a more fundamental property than its atomic mass.Who among the following scientists has made the above statement?

Ans: Henry Moseley

Question. Employing Chromatography, one cannot separate -

Ans: radio-isotopes

Question. Soap solution used for cleaning purpose appears cloudy. This is due to the fact that soap micelles can

Ans: scatter light

Question. In graphite, each carbon atom is bonded to three other carbon atoms -

Ans: in the same plane giving a hexagonal array

Question. Which one of the following is monatomic?

Ans: Helium

Question. Which one of the following statements is not correct?

Ans: Isobars are atoms having the same atomic number but different mass number

Question. Which one of the following is essential in corrosion of iron metal?

Ans: Oxygen and moisture

Question. Which one of the following acids is used in the car-batteries?

Ans: Sulphuric Acid

Question. Which one of the following is not a green house gas found naturally in the atmosphere?

Ans: Nitrogen oxide

Question. Which one of the following substances is not synthetic?

Ans: Fibroin

Question. Which of the following sub-stances is obtained from a tree?

Ans: Asafoetida

Question. Which of the following polymer is not a thermoplastic?

Ans: Neoprene

Question. Which of the following does not contribute to the acid rain?

Ans: Carbon Monoxide

Question. How many covalent bonds are present in a Chloropropane molecule having molecular formula, C3H7Cl?

Ans: 10

Question. Which one of the following is the most fundamental characteristic of an element?

Ans: Atomic number

Question. Neutrons were discovered by -

Ans: James Chadwick

Question. Atomic mass of an element is equal to the sum of number of -

Ans: protons and neutrons only

Question. Which one of the following element's isotope is used in the treatment of cancer?

Ans: Cobalt

Question. Which one of the following is the largest composition in biogas?

Ans: Methane

Question. Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are -

Ans: 5, 10 and 2 respectively

Question. Which one of the following statements regarding Bleaching powder and D.D.T. is correct?

Ans: Both contain chlorine

Question. Which one of the following is the best example of desiccant?

Ans: Silica gel

Question. Chalk and marble are different forms of -

Ans: Calcium carbonate

Question. The number of maximum electron in N Shell is -

Ans: 32

Question. Which of the following burns by producing a yellow, luminous flame?

Ans: Wax

Question. Which of the following is termed as a fuel for the future?

Ans: Hydrogen

Question. The modern periodic table was prepared by -

Ans: Bohr

Question. Which of the following is not a covalent compound?

Ans: Copper Sulphate

Question. How much amount of urea will be required for supplying 1 kg of nitrogen?

Ans: 2.2 kg

Question. Plaster of Paris is made up of -

Ans: Gypsum

Question. Which pollution is responsible for Knock-Knee-Syndrome?

Ans: Fluoride

Question. A sample of any of the following substances disappears after some-time when exposed to air like camphor, naphthalene or dry ice. This phenomenon is called -

Ans: Sublimation

Question. The gas, which is emitted in the paddy fields and increases the earth's temperature is -

Ans: Methane

Question. Which of the following is an example of herbicide?

Ans: Sodium chlorate

Question. Which one of the following materials contains calcium?

Ans: Gypsum

Question. What is the bond order of CO group?

Ans: 3

Question. Natural rubber is a polymer of -

Ans: Isoprene

Question. Oxygen is absent in -

Ans: Kerosene

Question. The main component of greenhouse gases is -

Ans: methane

Question. Which of the following is not a type of element?

Ans: Gases

Question. Which of the following is also known as laughing gas?

Ans: Nitric oxide

Question. The number of electrons and neutrons in an element is 18 and 20 respectively. Its mass number is -

Ans: 38

Question. Who is regarded as the Father of Modern Chemistry?

Ans: Lavoisier

Question. Limestone, chalk and marble are different forms of -

Ans: Calcium carbonate

Question. To which of the following family of elements does potassium belong?

Ans: Alkali metals

Question. In universal Indicators, red colour shows a pH of -

Ans: 0 to 3

Question. A group of more than three atoms carrying a charge is known as .......... ion.

Ans: Polyatomic

Question. Which of the following is a use of ethanol?

Ans: Manufacturing paints,In alcoholic drinks,In cough syrups

Question. The cooking gas (LPG) mainly consists of -

Ans: Propane and Butane

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