Who among the following laid the foundation of chemical sciences by establishing two important laws of chemical combination ?

[RRB NTPC CBT]

In 1784, who discovered the composition of water through his experiment with hydrogen and oxygen?

[SSC CPO 2023]

Who developed the theory of combustion as a chemical reaction with oxygen in the 18th century, that excluded phlogiston theory ?

[SSC CGL 2024]

Who, in the 1860s, undertook a thorough investigation of the gas laws expressing the relationships of pressure, temperature and volume in carbon dioxide?

[RRB NTPC CBT]

Name the law in Physics which states that equal volume of all gases under the same conditions of temperature and pressure contain equal numbers of molecules.

[SSC CGL 2019]

Who provided the basic theory about the nature of matter?

[RRB NTPC CBT]

In 1808, whose work provided a physical picture of how compounds are formed by the combination of two or more different types of atoms?

[SSC CGL 2023]

Who is the only scientist in the world to have won the Nobel Prize in Chemistry twice?

[SSC CGL 2019]

In which year Gay Lussac's Law of Gaseous Volumes was given by Gay Lussac?

[SSC CGL 2022]

In Charles's law _____.
(A) pressure is kept constant.
(B) The number of moles of gas is constant.
(C) Volume is directly proportional to temperature.

[SSC GD 2024]

The Nobel Prize in Chemistry 1951 was awarded jointly to Edwin Mattison McMillan and ______ for their discoveries in the chemistry of the transuranium elements

[SSC CGL 2022]

________ states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure.

[SSC CHSL 2022]

What was Antoine-Laurent Lavoisier's most important contribution to chemistry in 1789?

[SSC CGL 2024]

In 1937, who along with Sir Christopher Ingold proposed nucleophilic substitution reactions of alkyl halides and related compounds?

[SSC CHSL 2023]

One mole of an ideal gas occupies a volume of ______ litre at 273 K and 1 atm pressure

[SSC CGL 2021]

According to which of the following laws, the pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases?

[SSC CHSL 2022]

Who started the chemical revolution in the 18th century by naming oxygen and helping to organize chemical nomenclature ?

[SSC MTS 2023]

The total pressure of a mixture of ideal gases is the sum of partial pressures. This is__________ law of partial pressures.

[SSC CHSL 2022]

In which year did Antoine Lavoisier publish 'Methods of Chemical Nomenclature', which included the rules for naming chemical compounds that are still in use today?

[SSC CGL 2023]

In which of the following years did Antoine Lavoisier discover the law of conservation of mass and state that mass is conserved in a chemical reaction ?

[SSC CPO 2024]

Name the British Chemist who presented the atomic theory in 1808, on conservation of mass and law of definite proportions, which was a turning point in the study of motion.

[RRB NTPC CBT]

Who reconciled Dalton's atomic hypothesis with Gay-Lussac's results on the combination of volumes in 1811 ?

[SSC CGL 2024]

Which of the following statements are correct postulates of Dalton’s atomic theory?
A. All matter is made up of atoms. These atoms participate in chemical reactions.
B. Atoms might be created or destroyed during a chemical reaction.
C. Atoms of different elements vary in mass and chemical properties.
D. Compounds are combination of atoms in the ratio of whole or fractional numbers.
E. A compound will always have constant relative number and kind of atoms.

[SSC MTS 2024]

Who, in the 1860s, undertook a thorough investigation of the gas laws expressing the relationships of pressure, temperature and volume in carbon dioxide?

[SSC CHSL 2023]

Consider the following statements
A) A gas that follows Boyle's law, Charles' law and Avogadro law is called an ideal gas.
B) As per Gay Lussac's law, at constant volume, pressure of a fixed amount of a gas varies directly with the temperature.
C) Silicon is present in group 14 and period 3 of the periodic table.

[SSC GD 2024]

Which theory was published by John Dalton in 1808 to explain chemical reactions ?

[SSC MTS 2023]

At 10 × 104 Pa pressure and 300 K temperature, the volume of 0.09 mol CO2 gas is 22.4 × 10−3 m3. What will be the volume of the gas if the pressure is decreased to 2 × 104 Pa ?

[SSC MTS 2024]

In 1812, who described the hypothesis that equal volumes of different gases contain an equal number of molecules?

[SSC CHSL 2024]

According to which physical law, if the volume and number of molecules of a gas remain constant, then the pressure and temperature of the gas are directly proportional ?

[SSC GD 2024]

What is the relative charge of a proton and neutron?

[SSC MTS 2022]

According to which law, at constant temperature, the volume of a gas is inversely proportional to pressure ?

[RRB NTPC CBT]

In the early 1800s, who discovered that each chemical element is made up of a unique type of atom and that atoms differ by their mass?

[SSC CGL 2023]

Who coined the term 'zeroth law of thermodynamics' in 1931, which asserts that two bodies in equilibrium with a third are in equilibrium with each other?

[RRB NTPC CBT]

Who described in 1662 that when a gas was pumped into an enclosed space, it would shrink to fit in that space, but the pressure exerted by the gas on the container would increase?

[RRB NTPC CBT]

Which law, that was proposed in 1811, predicted that the same volume of gases at the same temperature and pressure would have the same number of molecules?

[SSC CGL 2022]

Identify the variable from the following that does not describe the behavior of the gas.

[RRB NTPC CBT]

At 1 bar pressure, the volume of a fixed amount of hydrogen gas is 2.27 litre. What will be the volume if the pressure is kept at 0.2 bar?

[SSC MTS 2024]

In 1662, who described the equation P1V1 = P2V2 , where P1 and V1 are the initial pressure and volume values, and P2 and V2 are the pressure and volume values of the gas after the transformation?

[RRB NTPC CBT]

Who described in 1662 that when a gas was pumped into an enclosed space, it would shrink to fit in that space, but the pressure exerted by the gas on the container would increase?

[SSC CHSL 2023]

Which two organic chemists are known for observing the peroxide effect in adding reagents to unsaturated compounds in 1933?

[SSC CGL 2024]

Which scientist synthesized an organic compound, urea, from an inorganic compound, ammonium cyanate?

[SSC CPO 2023]

What is the charge of an electron?

[SSC MTS 2024]

Which German chemist and physicist proposed that an aromatic compound must have an odd number of pairs of electrons, Which can mathematically be written as 4n + 2 (n = 0,1,2,3, etc.) in 1931?

[SSC CGL 2023]

The signs of charges of electron, proton and neutron are__________, respectively.

[SSC CPO 2024]

Who discovered that diborane reacts with aldehydes and ketones to produce dialkoxyboranes, Which are hydrolysed by water to produce alcohols?

[SSC CGL 2023]

Which French chemist was one of the first scientists to synthesize organic compounds such as formic acid, methane and acetylene from their elements?

[SSC CGL 2022]

In 1931, who recognised that an aromatic compound must have an odd number of pairs of electrons, which can mathematically be written as 4n+2 (n = 0,1,2,3 etc.)?

[SSC CGL 2022]

What does it mean when an object has a positive charge?

[SSC MTS 2022]

When did Louis Pasteur discover molecular chirality and observe that crystals of some compounds exist as mirror images which laid the foundation for modern stereochemistry ?

[SSC CHSL 2023]

Who received the Nobel Prize 'for his research in the stereochemistry of organic molecules and reactions' in 1975?

[SSC CGL 2023]