Structure of Atom. HN

Multiple Choice

Which of the following is (are) the drawbacks of Dalton’s atomic theory ?

• Isotopes

• Isobars

• Non stiochiometric compounds

• All of these

Multiple Choice

Discovery of electron was done by

• J.J. Thomson

• William Crook

• J. Plucker

• Bohr

Multiple Choice

Cathode ray tube is also called as

• Crook’s tube

• Discharge tube

• Both of these

• None of these

Multiple Choice

Properties of cathode rays are

• Made up of positively charged particles

• Produce fluorescence of MgS screen

• They do not ionize the gas in which they pass

• The e/m_e ratio is independent of nature of gas & electrode

Multiple Choice

Mass of proton is ________ times the mass of electron

• 1840

• 1480

• 2000

• 10000

Multiple Choice

Charge of a proton will be

• – 1.60 × 10^–19 C

• + 16 × 10^–19 C

• + 1.60 × 10^–19 C

• + 1.60 × 10¹⁹ C

Multiple Choice

The e/m ratio of which gas depends on nature of the gas

• Cathode rays

• UV rays

• Canal rays

• X – rays

Multiple Choice

Canal rays are

• Electromagnetic waves

• A stream of positively charged gaseous ion

• A stream of electrons

• Neutrons

Multiple Choice

Neutron was discovered by

• J.J.Thomson

• Goldstein

• Chadwick

• J. Plucker

Multiple Choice

Nucleons are

• Electron & Proton

• Proton & Neutron

• Electron & Neutron

• All of these

Multiple Choice

The number of electron in a neutral atom of an element is equal to its :

• Atomic weight

• Equivalent weight

• Atomic number

• Electron affinity

Multiple Choice

Which has highest e/m ratio ?

• He²⁺

• H⁺

• He⁺

• H

Multiple Choice

The triad of nuclei that is isotonic

• ¹⁴C₆ , ¹⁴N₇ , ¹⁹F₉

• ¹²C₆ , ¹⁴N₇ , ¹⁹F₉

• ¹⁴C₆ , ¹⁴N₇ , ¹⁷F₉

• ¹⁴C₆ , ¹⁵N₇ , ¹⁷F₉

Multiple Choice

The ion that is Isoelectronic with CO is :

• CN ^–

• O₂⁺

• O₂

• N₂⁺

Multiple Choice

Isobar of calcium will be

• Ar

• K

• Cl

• Sc