All the member of homologous series can be represented by the same general formula. Choose the INCORRECT formula from among the following. Alkane - Cn H2n+2 Alkene - Cn H2n+1 Alkyne - Cn H2n-2
1.Alkane - Cn H2n+2 and Alkyne - Cn H2n-2
2.Alkane - Cn H2n+2
3.Alkene - Cn H2n+1
4. Alkyne - Cn H2n-2
An element having atomic number 17 will resemble which of the following elements having Atomic number as given below?
1.33
2.34
3.18
4.34
Brass is an alloy made of
1. Copper and Tin
2.Copper and Zinc
3.Copper and Aluminium
4.Copper and Iron
During combustion of unsaturated compounds a ___ is seen.
1.clean flame
2.blue flame
3.red flame
4.yellow flame
Galvanization a process to prevent rusting involves use of ___ coating to steel or iron.
1.Nickel
2.Magnesium
3.Copper
4.Zinc
Identify a use of the isotope of uranium.
1.Fuel in nuclear reactors
2.Treatment of goitre
3.Treatment of cancer
4.Fuel in aeroplanes
In Newlands table the elements ___ were placed with the halogens.
1.Ce and La
2.Fe and Se
3.Mn and As
4.Co and Ni
In which of the following groups of the modern periodic table are the noble gases placed?
1.16
2.18
3.17
4.15
Least distance of distinct vision for normal eye is
1.15cm
2.20cm
3.25 cm
4.30cm
Name the only metal that is antibacterial.
1.Iron
2.Sodium
3.Aluminium
4.Copper
One should use porcelain and not metal containers in a microwave oven because..
1.Charge may accumulate on the metal surface and there is danger of getting a shock
2.Porcelain vessels are better conductors of heat and thus food gets cooked quickly
3.Metal containers might undergo chemical reaction leading to spoilage of food
4.Porcelain vessels are cheaper than the metal containers
Pernicious anaemia is caused by the deficiency of vitamin .......
1.B2
2.B6
3.B3
4.B1
Rupee 5 and 10 coins are now made of
1.Ferritic stainless steel
2.Silver and steel
3.Cupro nickel alloy
4.Copper and brass
Safety matches contain
1.Sulphur
2.Phosphorus
3.Magnesium
4.Potassium
The 4th and 5th periods contain:
1. 8 elements
2.18 elements
3.11 elements
4.9 elements
The mass number of an isotope of an element is 298. If its nucleus has 196 neutrons what is its atomic number?
1.196
2.102
3.494
4.298
The most active ingredient in bleaching powder is
1.Iodine
2. Calcium hypochlorite
3. Nitric acid
4.Ammonium sulphate
The smell that we get when LPG cylinder leaks is due to the presence of
1.Nitrogen peroxide
2.Carbon monoxide
3.Sulphur compound
4.Carbon dioxide
What happens when dilute hydrochloric acid is added to iron filings?
1.Only chloride are produced
2.Hydrogen gas and iron chloride are produced
3.No reaction take place
4.Only hydrogen gas is produced
What is mixing an acid with water that results in a decrease in the concentration of ions per unit volume called?
1.Dilution
2.Neutralisation
3.Acidification
4.Concentration
What is the maximum number of electrons that the outermost shell can have?
1.2
2.6
3.8
4.none
What is the molecular formula of Calcium Phosphate?
1.Ca3(PO4)2
2.Ca(PO4)2
3.CaPO4
4.Ca3(PO4)3
What is the number of atoms constituting a molecule known as?
1.Atomicity
2.Atomic mass
3. Atomic number
4.Isotopes
When copper oxide is heated with hydrogen. copper metal and water are formed. What happens to the hydrogen in this reaction?
1.both oxidation and reduction
2.Reduction
3.Oxidation
4.Decomposition
When milk becomes sour ___ is produced.
1.Lactose
2.Lactic acid
3.Salicylic acid
4.Linoleic acid
Which among the following happens in an oxidation reaction?
1.Electrons are gained
2.Electrons are lost
3.Protons are gained
4.Protons are lost
Which among the following has its refractive index closest to that of crown glass?
1.Diamond
2.Ruby
3.Sapphire
4.Canada balsam
Which among the following is a cation?
1.Ammonium
2.Iodide
3.Chloride
4.Calcium
Which among the following is popularly called Laughing gas?
1.Nitric oxide
2.Nitrogen dioxide
3.Nitrous oxide
4.Nitrogen peroxide
Which gas is released when bleaching powder is added to water?
1.Carbon Dioxide
2.Hydrogen
3.Chlorine
4.Carbon Monoxide
Which of the following acids is NOT present in grapes?
1.Acetic acid
2.Malic acid
3.Tartaric acid
4.Citric acid
Which of the following can be used as a catalyst in Hydrogenation reaction?
1.Barium
2.Iron
3.Tungsten
4.Palladium
Which of the following can undergo sublimation?
1. Ammonium chloride
2.Ammonium chlorate
3.Ammonium sulphate
4.Ammonium phosphate
Which of the following gases is consistently seen to be most abundant in a volcanic eruption?
1.Sulphur Dioxide
2.Carbon Dioxide
3.Water vapour
4.Hydrogen Sulphide
Which of the following is a chemical change?
1.Butter turning rancid
2.Making dry ice from CO2
3.Heating a platinum wire
4.Magnetisation of iron
Which of the following is also known as Epsom salt?
1.Calcium Sulphate
2.Magnesium Sulphate
3.Sodium Sulphate
4.Ferrous Sulphate
Which of the following is an example of a metal that needs to be stored under oil?
1.Potassium
2.Gold
3.Iron
4.Silver
Which of the following is not an example of a biomass energy source?
1.Wood
2.Ethanol
3.Cow dung
4. Atomic energy
Which of the following is NOT an ore of iron?
1.Cuprite
2.Haematite
3.Magnetite
4.Siderite
Which of the following is used as a substitute of mercury in thermometers?
1.Selenium
2.Arsenic
3.Galinstan
4.Bromine
Which of the following is used for removing permanent hardness of water?
1.Lime
2.Washing soda
3.Bleaching powder
4.Baking soda
Which of the following is used in the preparation of vinegar?
1.Methanol
2.Acetic acid
3.Ethanol
4.Ethanoic acid
Which of the following is used to remove the green colour from glass?
1.Manganese dioxide
2.Sulphur dioxide
3.Titanium dioxide
4.Silicon dioxide
Which of the following metals reacts vigorously with cold water?
1.Potassium
2.Aluminium
3.Zinc
4.Iron
Which of the following statement(s) is/are CORRECT? I. Carbon compounds linked by only single bond are called saturated compounds. II. Carbon compounds having double or triple bonds are called unsaturated compounds. III. Saturated carbon compounds are more reactive than unsaturated carbon compounds.
1.Only I and II
2.Only I and III
3.Only II and III
4. All I II and III
Who predicted the existence of some yet to be discovered elements on the basis of gaps in his periodic table?
1.Mendeleev
2.Dobereiner
3.Newlands
4.Darwiin
__ are homogeneous mixtures of two or more components.
1.Amalgams
2.Solutions
3.Enzymes
4.Emulsions
___ is one of the states of matter obtained by cooling a gas of very low density to extremely low temperatures.
1.Gas
2.Plasma
3.Bose-Einstein Condensate (BEC)
4.Plasma Condensate