A mixture of sand and naphthalene can be separated by
1.Fractional distillation
2.Sublimation
3.Chromatography
4.Any of them
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Among the given nutrients milk is a poor source of
1.Calcium
2.Protein
3.Vitamin C
4.Carbohydrates
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Cobalt - 60 is commonly used in radiation therapy because it emits
1. alpha - rays
2.beta rays
3.gamma rays
4.X - rays
Posted Date:-2021-06-30 06:17:00
Give the common name for the following compound (CH3)2CH CH2 ? Br
1. Isobutyl bromide
2. Methyl bromide
3.Propyl bromide
4.Butyl bromide
Posted Date:-2021-06-30 06:17:00
he M.K.S. system was first introduced by
1.archimedes
2.Eienstein
3.Newton
4.Giorgi
Posted Date:-2021-06-30 06:17:00
How many electrons are there in Na+
1.1
2.10
3.11
4.12
Posted Date:-2021-06-30 06:17:00
Hydrogen bomb is based on the principle of
1.nuclear fission
2.nuclear fusion
3.natural radioactivity
4.artificial radioactivity
Posted Date:-2021-06-30 06:17:00
Is C2 Paramagnetic or Diamagnetic?
1. Paramagnetic
2. Diamagnetic
3.Ferromagnetic
4. Cant be determined
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Name the Scientist who stated that matter can be converted into energy
1.Boyle
2.Lavoisier
3.Avogadro
4.Einstein
Posted Date:-2021-06-30 06:17:00
NH3 oxidation number?
1.-1
2.1
3.0
4.-3
Posted Date:-2021-06-30 06:17:00
Permanent Hardness of water can be removed by adding
1.Bleaching powder
2.Chlorine
3.Wasshing soda
4.Potassium permanganate
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
SI unit of equivalent conductance
1. ohm/cm
2.Siemens m2/equivalent
3.Siemens/equivalent
4.mho/cm
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Temporary hardness is due to the presence of
1.Calcium carbonate
2.calcium bicarbonate
3.magnesium sulphate
4.calcium sulphate
Posted Date:-2021-06-30 06:17:00
The absolute value of charge on electron was determined by
1.J.J.Thomson
2.R.A. Millikan
3.Rutherford
4.Chadwick
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
The enzyme that converts glucose to ethyl alcohol is
1.Maltase
2.Zymase
3.Diastase
4.Invertase
Posted Date:-2021-06-30 06:17:00
The purest form of iron is
1.wrought iron
2.steel
3.pig iron
4. nickel steel
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
what is the chemical name of the compound Cu2CO3
1.copper (ii) carbonate
2.copper (iii) carbonate
3.copper (i) carbonate
4. copper carbonate
Posted Date:-2021-06-30 06:17:00
What is the element present in urea
1.CHO
2. CNO
3.CNH
4. CONH
Posted Date:-2021-06-30 06:17:00
What is the IUPAC name for the following compound? H3C?C?C?H
1.Acetylene
2.Methyl acetylene
3.Butanol
4.Decanoic Acid
Posted Date:-2021-06-30 06:17:00
What is the oxidation number of sulfur in H2S?
1.2
2.-2
3.1
4.-1
Posted Date:-2021-06-30 06:17:00
What is the structure of IF7 ?
1.Triagonal bipyramid
2.Pentagonal bipyramid
3. Square pyramid
4.tetrahedral
Posted Date:-2021-06-30 06:17:00
What is the third most common gas found in the air we breathe ?
1.Argon
2.Neon
3.Carbondioxide
4.Hydrogen
Posted Date:-2021-06-30 06:17:00
When formaldehyde and potassium hydroxide are heated we get
1.Acetylene
2.Methyl alcohol
3.Methane
4. Ethyl formate
Posted Date:-2021-06-30 06:17:00
When water freezes its density
1.decreases
2.remains constant
3.increases
4. become zero
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Which of the following is a non metal that remains liquid at room temperature ?
1.Chlorine
2. Phosphorous
3.Bromine
4.Helium
Posted Date:-2021-06-30 06:17:00
Which of the Following is an Amorphous solid?
1. Quartz Glass(Sio2)
2.Chrome Alum
3.Silicon Carbide(SiC)
4.Graphite
Posted Date:-2021-06-30 06:17:00
Which of the following is NOT a compound?
1.Ammonia
2.Milk
3.Sodiumchloride
4.Chalk
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Which one of the following elements is essential for construction is nuclear reactors
1.Cobalt
2.Nickel
3.Zirconium
4.Tungsten
Posted Date:-2021-06-30 06:17:00
Which one of the following is not a mixture
1.air
2.mercury
3.milk
4.cement
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
Which one of the following substances does not have a melting point
1.bromine
2.sodium chloride
3.mercury
4.glass
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00
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
Posted Date:-2021-06-30 06:17:00