A/an ___ flame is produced when the oxygen supply is sufficient.
1.red
2.orange
3.blue
4.green
Barium loses ____ electrons to achieve noble gas electron configuration.
1.1
2.2
3.3
4.4
Calcium salts used as fertilizer is:
1.Calcium Carbide
2.Calcium Carbonate
3.Calcium Cyanide
4.Calcium Sulphate
Dobereiner could identify only ......... triads from the elements known at that time.
1.1
2.3
3.4
4.2
During which change is energy absorbed?
1.Exothermic
2.Endothermic
3. Both A & B
4.Neither A nor B
Elements having same atomic numbers but different mass number are called ______.
1.isotones
2.Isotopes
3.isomopes
4.isobar
Hydrogenation process is associated with which of the following?
1.Rubber
2.Petroleum
3.Copper
4.Edible fats
If we take a small amount of washing soda and add approximately 1 mL of dilute hydrochloric acid to it, what will we observe?
1. only neutralisation reaction occurs, no gas is released
2.white-coloured precipitate is formed
3.CO2 gas comes out with brisk effervescence
4. H2 gas comes out with pop sound
In a compound the elements are always present in definite proportions by
1.mass
2.volume
3.size
4.No option is correct
In case of a standard hydrogen electrode
1.absolute electrode potential is not zero
2.absolute electrode potential is zero
3.both absolute and standard electrode potential values are zero
4.electrode potential is zero only at 25 deg C
Kidney stones are composed of ______.
1.9OL
2.Sodium Chloride
3.Magnesium Nitrate
4.Calcium Bicarbonate
Mass number is always equal to ______.
1.number of protons
2.number of neutrons
3.sum of number of protons and number of electrons
4.sum of number of protons and number of neutrons
Ozone is an ______ of oxygen.
1.Allotrope
2.Isotope
3.Isobar
4.Isotone
pH of the human blood is ______.
1.Slightly Acidic
2.Highly Acidic
3.Slightly Basic
4. Highly Basic
Rust is formed from iron and
1.Carbon
2.Oxygen
3.Hydrogen
4.All of the above
Sour taste of lemon is due to the presence of which of the following ?
1.Citric acid
2.Acetic acid
3.Oxalic acid
4.Formic acid
The conversion of hard water into soft water by boiling or adding calcium hydroxide is called _______.
1.Baker's process
2.Temp's process
3.Clarke's process
4.Lake's process
The hazardous component in most antifreeze is
1.Ethane alcohol
2.Ethylene Glycol
3.Ehtylene
4.Ethene
The most reactive of the following metals is
1.Al
2.Ca
3.Ni
4.Pb
The passage of an electric current through a conducting liquid causes ___________.
1.Galvanisation
2.Evaporation
3.Physical Reaction
4.Chemical Reaction
The phosphorus cycle differs from the biogeochemical cycles in that
1.does not have atmospheric reservoir
2.uses water more
3.have atmospheric reservoir
4.None of the above
The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.
1.Crystallisation
2.Melting point
3.Evaporation
4.Galvanisation
The vast amount of sea weeds present in oceans may produce an endless source of
1.Methane
2.Ocean thermal energy
3.Sea wave energy
4.Nuclear energy
tomic number of which of the following elements is greater than that of Zinc
1.Copper
2.Iron
3.Chromium
4.Bromine
What is a normal pH level in blood?
1.7.35 - 7.45
2.7.45 - 7.55
3.7.6 - 7.7
4.7 - 7.10
What is the general formula for a straight-chain alkane?
1.C2nH2n+3.
2.CnH2n+2
3. CnH2n
4.CnH3n+2.
What is the general formula of alkenes?
1.CnH2n
2.CnH2n+2
3.CnH2n-2
4.CnH2n-1
What is the natural source of Oxalic acid?
1.Tomato
2.Sour milk
3.Ant sting
4.Tamarind
What is the percentage of oxygen in Al2(SO4)3?
1.57.70%
2.56.10%
3.53.10%
4.52.60%
What is the product formed when sodium bicarbonate is heated strongly?
1.Sodium Carbonate
2.Sodium Hydroxide
3.Sodium Peroxide
4.Sodium Monoxide
What is the value of triple point (solid, liquid and gas) of Water?
1.273.16 C
2.-273.16 K
3.273.16 K
4.0 C
Which one of the following is not a semiconductor?
1.Silicon
2.Germanium
3.Quartz
4.Gallium arsenide
Which among the following is an endothermic reaction?
1.Respiration
2.Combustion
3.Sweating
4.Burning of natural gas
Which among the following is an example of solid sol?
1.Milk of magnesia
2.Foam
3.Coloured gemstones
4.Rubber
Which among the following is white phosphorus?
1.P1
2.P6
3.P4
4.P5
Which base is present in lime water?
1.Sodium hydroxide
2.Magnesium hydroxide
3.Calcium hydroxide
4.Ammonium hydroxide
Which base is present in milk of magnesia?
1.Magnesium hydroxide
2.Ammonium hydroxide
3.Sodium hydroxide
4.Calcium hydroxide
Which compound is a saturated hydrocarbon?
1.Alkene
2.Alkane
3.Alkine
4.All of the above
Which element has the lowest ionization energy?
1.He
2.Ne
3.Fr
4.R
Which molecule is used up in photosynthesis?
1.Water
2.Carbohydrates
3.Oxgen
4.Sugar
Which of the following can be beaten and converted into thin sheets?
1.Zinc
2.Phosphorus
3.Sulphur
4.Oxygen
Which of the following elements is used for vulcanizing rubber?
1.Sulphur
2.Chlorine
3.Bromine
4.Phosphorus
Which of the following inert gases is placed in period 4 of the periodic table?
1.Kr
2.Rn
3.Xe
4.Ar
Which of the following is a Synthetic rubber?
1.Leoprene
2.Monoprene
3.Neoprene
4.Isoprene
Which of the following is also known as Carbolic Acid?
1.Phenol
2.Hydroxide
3. Sulphuric Acid
4.Ethanol
Which of the following is an inert gas most commonly found in light bulbs?
1.Argon
2.Hydrogen
3.Oxygen
4.Radon
Which of the following is not a semiconductor?
1.CdS
2.NaCl
3.Si
4.Ge
Which process usually requires water?
1.Physical weathering
2. Mass wasting
3.Chemical weathering
4.Erosion
______ is made by mixing iron with carbon and metals like chromium, nickel and manganese.
1.Ship
2.Stainless Steel
3.Rust
4.Ozone