A mixture of sand and naphthalene can be separated by
1.Fractional distillation
2.Sublimation
3.Chromatography
4.Any of them
A breath test used by traffic police to check drunken driving uses ____?
1. Turmeric on filter paper
2.Silica gel coated with silver nitrate
3.potassium permanganate-sulphuric acid
4.Potassium dichromatic-sulphuric acid
Among the following the maximum covalent character is shown by the compound (1)MgCl2 (2)FeCl2 (3)SnCl2 (4) AlCl3
1.Option 1
2.Option 2
3.Option 3
4.Option 4
Among the given nutrients milk is a poor source of
1.Calcium
2.Protein
3.Vitamin C
4.Carbohydrates
Boron cannot form which one of the following anions? (1) BO?2 (2) BF3?6 (3) BH?4 (4) B(OH)?4
1.Option 1
2.Option 2
3.Option 3
4. Option 4
Brass gets discoloured in air because of the presence of which of the following gases in air ?
1.Hydrogen sulphide
2.Oxygen
3.Nitrogen
4. Carbon dioxide
Cobalt - 60 is commonly used in radiation therapy because it emits
1. alpha - rays
2.beta rays
3.gamma rays
4.X - rays
Give the common name for the following compound (CH3)2CH CH2 ? Br
1. Isobutyl bromide
2. Methyl bromide
3.Propyl bromide
4.Butyl bromide
he M.K.S. system was first introduced by
1.archimedes
2.Eienstein
3.Newton
4.Giorgi
How many electrons are there in Na+
1.1
2.10
3.11
4.12
Hydrogen bomb is based on the principle of
1.nuclear fission
2.nuclear fusion
3.natural radioactivity
4.artificial radioactivity
Is C2 Paramagnetic or Diamagnetic?
1. Paramagnetic
2. Diamagnetic
3.Ferromagnetic
4. Cant be determined
Misch metal is widely used in manufacture of which of the following
1.Material of car brake
2.Smoke detectors
3.Cigarette lighters
4.Emergency lights
Name the Scientist who stated that matter can be converted into energy
1.Boyle
2.Lavoisier
3.Avogadro
4.Einstein
NH3 oxidation number?
1.-1
2.1
3.0
4.-3
Permanent Hardness of water can be removed by adding
1.Bleaching powder
2.Chlorine
3.Wasshing soda
4.Potassium permanganate
Place these hydrocarbons in order of decreasing boiling point. 1. Paraffin 2. Octadecane 3. Hexane 4. Neohexane and 5. Ethane
1. Paraffin > Octadecane > Neohexane > Hexane > Ethane
2.Paraffin > Octadecane > Hexane > Neohexane > Ethane
3.Hexane > Paraffin > Octadecane > Neohexane > Ethane
4. None of the above
SI unit of equivalent conductance
1. ohm/cm
2.Siemens m2/equivalent
3.Siemens/equivalent
4.mho/cm
Silver Mirror test is given by which one of the following compounds? 1. Benzophenone 2. Acetaldehyde 3. Acetone 4. Formaldehyde
1.Only 1
2. Only 2
3.1 and 3
4.2 and 4
Temporary hardness is due to the presence of
1.Calcium carbonate
2.calcium bicarbonate
3.magnesium sulphate
4.calcium sulphate
The absolute value of charge on electron was determined by
1.J.J.Thomson
2.R.A. Millikan
3.Rutherford
4.Chadwick
The discovery of neutron became very late because
1. it is present in nucleus
2.it is a fundamental particle
3.it does not move
4.it does not carry any charge
The electrochemical cell stops working after some time because ________
1.Electrode potential of both the electrodes becomes zero
2. One of electrodes completely vanishes
3.Electrode potential of both electrodes equalizes
4.The reaction reverses its direction
The entropy change involved in the isothermal reversible expansion of 2 moles of an ideal gas from a volume of 10 dm3 at 27 Degree C is to a volume of 100 dm3
1.42.3 J/ mole / K
2.38.3 J/ mole / K
3.35.8 J/ mole / K
4.32.3 J/ mole / K
The enzyme that converts glucose to ethyl alcohol is
1.Maltase
2.Zymase
3.Diastase
4.Invertase
The purest form of iron is
1.wrought iron
2.steel
3.pig iron
4. nickel steel
The reduction potential of hydrogen half-cell will be negative if : (1) P(H2)= 2 atm and [H+] = 2.0 M (2) P(H2)= 1 atm and [H+] = 2.0 M (3) P(H2)= 1 atm and [H+] = 1.0 M (4) P(H2)= 2 atm and [H+] = 1.0 M
1.Option 1
2.Option 2
3.Option 3
4.Option 4
what is the chemical name of the compound Cu2CO3
1.copper (ii) carbonate
2.copper (iii) carbonate
3.copper (i) carbonate
4. copper carbonate
What is the element present in urea
1.CHO
2. CNO
3.CNH
4. CONH
What is the IUPAC name for the following compound? H3C?C?C?H
1.Acetylene
2.Methyl acetylene
3.Butanol
4.Decanoic Acid
What is the oxidation number of sulfur in H2S?
1.2
2.-2
3.1
4.-1
What is the structure of IF7 ?
1.Triagonal bipyramid
2.Pentagonal bipyramid
3. Square pyramid
4.tetrahedral
What is the third most common gas found in the air we breathe ?
1.Argon
2.Neon
3.Carbondioxide
4.Hydrogen
When formaldehyde and potassium hydroxide are heated we get
1.Acetylene
2.Methyl alcohol
3.Methane
4. Ethyl formate
When water freezes its density
1.decreases
2.remains constant
3.increases
4. become zero
which of the following are chemical changes? A) Cooking of Food B) Digestion of Food C) Freezing of water D) Water is heated up
1.A & B
2.A B & C
3.C & D
4.All the above
Which of the following is a non metal that remains liquid at room temperature ?
1.Chlorine
2. Phosphorous
3.Bromine
4.Helium
Which of the Following is an Amorphous solid?
1. Quartz Glass(Sio2)
2.Chrome Alum
3.Silicon Carbide(SiC)
4.Graphite
Which of the following is NOT a compound?
1.Ammonia
2.Milk
3.Sodiumchloride
4.Chalk
Which of the following reactions are exothermic? 1) C + O2 ? CO22) 2Mg + O2 ? 2MgO3) CuSO4 + 5H2O ? CuSO4.5H2O4) All the above
1.1
2.2
3.3
4.4
Which one of the following elements is essential for construction is nuclear reactors
1.Cobalt
2.Nickel
3.Zirconium
4.Tungsten
Which one of the following is not a mixture
1.air
2.mercury
3.milk
4.cement
Which one of the following mixture is homogeneous
1.starch and sugar
2.methanol and water
3. graphite and charcoal
4.calcium carbonate and calcium bicarbonate
Which one of the following substances does not have a melting point
1.bromine
2.sodium chloride
3.mercury
4.glass
Which pair of atoms has the highest electronegativity difference? (Calciums electronegativity is 1.0 Fluorines electronegativity is 4.0 Hydrogens electronegativity is 2.2 Sodiums electronegativity is 0.93
1. F-F
2.Ca-F
3. H-F
4.Na-F
Which solution is most concentrated?
1.6 g of solute in 10 ml of solution
2.20.5 g of solute in 50 ml of solution
3.30 g of solute in 120 ml of solution
4. 2.6 g of solute in 2 ml of solution
Yellow cake an item of smuggling across border s
1. A crude form of heroin
2.A crude form of cocaine
3. Uranium oxide
4. Unrefined gold