chemistry

INTRODUCTION, FUNDAMENTAL PARTICLES

1.        Which of the following is a fundamental particle?

	1) Proton		2) Neutron	3) Electron			4) All
2.	A neutral atom (At.no. >1) has
	1)	Electron and proton		2)	Neutron and electron
	3)	Neutron, electron and proton		4)	Neutron and proton
3.	The study of		discharge of electricity through gases at low			pressures led to the
						.
	discovery of						com
	1)	Electron	2) Nucleus	3)	Neu ron	4) Proton

4.        Electron is a particle having a

1)Negative charge of one unit and zero mass

2)Positive charge of one unit and zero mass

3)Negative charge of one unit and a mass of about 9.1 × 10^–31 kg

4) Negative charge of one unit and a mass of about 1.67 × 10^–27 kg.

5.       The value of e/m for an electron is

	1)	1.78 × 108 c/g	2) 1.6724 × 10–24 c/g		3) 0.005486 c/g	4) 1.00866 c/g
6.	Charge of electron is
	1)	1.602 × 10–10	Coulomb	2) 4.8 × 10–10 coulomb
		.		4) 4.8 × 10–10 e.s.u
	3)	1.602 × 10–19 e.s.u
7.	The e/m of proton is
	1)	1.78 × 108 c/g	2) 9.57 × 104 c/g	3) 19.14 × 104 c/g   4) 0.478 × 104 c/g
8.	Atomic number is equal to the
	1)	Number of neutrons in the nucleus		2) Number of protons in the nucleus
	3)	Sum of protons and neutrons		4) Atomic Mass of the element.

9.        The number of protons, electrons and neutrons in ⁸²₃₅ Br are respectively

1) 35, 35, 47               2) 35, 35, 45                3) 80, 80, 35            4) 45, 45, 35

10.  The number of neutrons in the Zn+2 ion (Mass no. of Zn = 65)

	1)	35			2) 33		3)	65	4) 67
11.	Which one of the following is an isobar of						7N14?
	1)	6C13			2) 6C12		3)	6C14	4) 7N15
12.	Number of protons in the nucleus of Lead atom is (For Pb, Z=82and A=208)
	1)82				2) 126		3)	208	4) 164
13.	The number of nucleons in Uranium--238 is (For U, Z=92)								.
	1)	92			2) 146		3)	238		com
									4)184
14.	The nucleus of an atom contains
	1)	Electrons and protons					2)	Protons nd neutrons
	3)	Electrons and beta particles					4)	Protons and alpha particles
15.	The isotopes of neutral atoms of an element  iffer in
	1)	Atomic Number			2) Mass Numb r		3) Chemical Properties   4) Both 1and3
16.	The nucleus of tritium (1H3) cons sts of
	1)	1 proton + 1 neutron					2)	1 proton + 3 neutrons
	3)1 proton + zero neutrons						4)	1 proton + 2 neutrons
17.	Sodium ion is i oelectronic with
	1)	Mg2+			2) N3-		3) Ne		4) All of the above
18.
	The ratio bet  een number of nuetrons present in C-14 and								Si-28 atoms is
	1)	1; 2			2) 4:7		3)	7:4	4) 2:1
19.	Rutherford's alpha ray scattering experiment showed for the first time that the
	atom has
					2) Proton	3) Electron			4) Neutron
	1)	Nucleus
20.	Nitride ion in AlN is composed of
	1)	7 protons + 7 electrons					2)	10 protons + 7 protons
	3)	7 protons + 10 electrons					4)	10 protons + 10 electrons