Chemistry

Which of the following statements is wrong about isotopes ?

Options:

• A. they possess different mass number
• B. they possess different physical properties
• C. they possess same chemical properties
• D. they possess different position in the periodic table

View Answer

D. they possess different position in the periodic table

Paramagnetic behaviour of substance is measured by a balance called___________________?

Options:

• A. Analytical balance
• B. Guoys balance
• C. Electrical balance
• D. Single beam balance

View Answer

B. Guoys balance

Qualitative analysis is carried out for _________________?

Options:

• A. identification of elements
• B. estimation of amounts of elements
• C. molar ration of elements
• D. molar volume of elements

View Answer

A. identification of elements

Combustion analysis is performed to determine__________________?

Options:

• A. Empirical formula
• B. Molecular mass
• C. Molecular formula
• D. Formula mass

View Answer

A. Empirical formula

Isotopes differ in_________________?

Options:

• A. properties which depend upon mass
• B. arrangement of electrons in orbitals
• C. chemical properties
• D. all of the above

View Answer

A. properties which depend upon mass

Which of the following methods is used to estimate hydrogen in an organic compound ?

Options:

• A. Combustion method
• B. Dumas method
• C. Kjeldahls method
• D. All of the above methods are for different purposes

View Answer

A. Combustion method

The nucleus of an atom of every element will always contain____________________?

Options:

• A. neutrons
• B. protons and electrons
• C. protons
• D. protons and neutrons

View Answer

C. protons

When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether ?

Options:

• A. 0.5
• B. 1
• C. 1.5
• D. 2

View Answer

D. 2

Dempsters mass spectrometer has number of zones / parts_________________?

Options:

• A. 5
• B. 4
• C. 3
• D. 2

View Answer

A. 5

All the following variables are used to describle gases except__________________?

Options:

• A. pressure
• B. volume
• C. moles
• D. density

View Answer

D. density