Question

68. Which of the following are homogeneous in nature ?
(j) ice
(it) wood
(111) soil
(iv) air
(a) () and (iii)
(b) (i) and (iv)
(C) (i) and (iv)
(d) (i) and (iv)
63. Two chemical substances X and Y combine together to form a product P which contains both X and Y
X +
YP.
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following
statements concerning X, Y and P are correct?
(2) P is a compound
(ii) X and Y are compounds
(ili) X and Y are elements
(iv) P has a fixed composition
(a) (1). (i) and (ii)
(b) (i), (ii) and (iv)
(c) (ti), (it) and (iv)
(d) (i), (ii) and (iv)
7. Which of the following does not have a fixed melting point/boiling point ?
(a) gold
(b) ethanol
(C) air
(d) oxygen​

Answer 1

Answer:

Review on nanoparticles and nanostructured materials: history, sources, toxicity and regulations

Jaison Jeevanandam, Ahmed Barhoum, [...], and Michael K Danquah

Additional article information

Abstract

Nanomaterials (NMs) have gained prominence in technological advancements due to their tunable physical, chemical and biological properties with enhanced performance over their bulk counterparts. NMs are categorized depending on their size, composition, shape, and origin. The ability to predict the unique properties of NMs increases the value of each classification. Due to increased growth of production of NMs and their industrial applications, issues relating to toxicity are inevitable. The aim of this review is to compare synthetic (engineered) and naturally occurring nanoparticles (NPs) and nanostructured materials (NSMs) to identify their nanoscale properties and to define the specific knowledge gaps related to the risk assessment of NPs and NSMs in the environment. The review presents an overview of the history and classifications of NMs and gives an overview of the various sources of NPs and NSMs, from natural to synthetic, and their toxic effects towards mammalian cells and tissue. Additionally, the types of toxic reactions associated with NPs and NSMs and the regulations implemented by different countries to reduce the associated risks are also discussed.

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