Chemistry

Valium – Tranquilizer

Morphine – Analgesic

Norethindrone – Antifertility drug

Vitamin B₁₂ – Pernicious anaemia

Density = $\frac{mass}{volume}$

Cu > Co > Fe > Cr > Zn

Kindly consider the following figure

Sphalerite is ore of zinc consists of ZnS during its concentration group 1 cyanides are used as depressants like NaCN

Major components of gun metal are Cu, Sn and Zn

JJ Thomson, through the cathode ray tube experiment, discovered electrons. He passes the electricity from the tube and sees rays coming from the negative end. These are tiny negatively charged particles, he named them electrons.

JJ Thomson's model of the atom proposed that an atom is like a sphere (pudding) and electrons are spread around it like a plum or chocolate chips. Basically atom is overall neutral.

The structure of an atom reflects how the atom is made, which includes the nucleus at the centre where protons and neutrons are present, and electrons revolving around the nucleus.

Mass of Na⁺ in 50 ml = 70 * 50 = 3500 mg

23000 mg of Na⁺ is present in 85000 mg of NaNO₃ (1 mole NaNO₃ contains 1 mole Na⁺)

$\therefore 3500$   mg Na⁺ will be present in   $\frac{85000}{23000}*3500$

= 12934.78 mg

= 12.93478 gm

$\cong 13$