Question

i. Na2CO3.10H2O is an example of:

(A) Anhydrous substance (B) Hydrated salt

(C) Hygroscopic substance (D) Drying agent

ii. Name the following law: “When elements are arranged in order of increasing atomic masses, the first

and eighth element have similar chemical properties like the eight notes of an octave of music”.

(A) Dobereiner Triads (B) Newland law of octaves

(C) Mendeleev periodic law (D) Modern periodic law

iii. Aurum is the latin name for the metal:

(A) Gold (B) Lead (C) Iron (D) Silver

iv. The valency of nitrogen in Nitrogen dioxide (NO2) is:

(A) One (B) Two (C) Three (D) Four

v. The elements which are very reactive and are converted into amalgams to decrease their reactivity:

(A) Noble gases (B) Alkaline earth metals (C) Halogens (D) Alkali metals
PLEASE TELL FAST​

Answer 1

Answer:

Answer is b, d, b, c, b I guess according to my study, but not sure