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Why are bases slippery and taste bitter where as acids are not slippery and taste sour?

Why all ores are minerals but all minerals are not ores?

How to balance chemical equations step by step as required in CBSE board exams?

List some of the applications of Avogadro’s law.

An element A belongs to the third period and group 1 of the periodic table. Find out :

i. The number of valence electrons in its atoms.

ii. Valency of the element.

iii. Name of the element.

1. 25

What are the products of green chemistry?

An element 'X' is denoted by$\begin{array}{c}34\\ 16\end{array}X$ How many neutrons, electrons and protons are present respectively?

Petrochemicals obtained from crude oil are made up of different ________.

Give the balanced reactions for the following:

(a) Sodium is dropped in water,

(b) Magnesium reacts with boiling water,

(c) Red hot ion reacts with steam,

(d) Iron reacts with dilute HCl.

Balance the following chemical equation

Calcium hydroxide + carbon dioxide -calcium carbonate + water

In the following reaction:
$Mn{O}_2\left(s\right)+4HCl\left(aq\right)\to MnC{l}_2\left(aq\right)+C{l}_2\left(g\right)+2H_{2}O\left(l\right)$
Identify the oxidising and reducing agents.

The no of neutrons in 1.6 g of CH₄

(a) What happens when calcium reacts with chlorine? Write an equation for the reaction which takes place.
(b) What happens when magnesium reacts with a very dilute nitric acid? Write an equation for the reaction involved.

How is principal quantum number related to modern periodic table?

Wat is principal quantum number

In this students portal , when selected the chapter "introduction to chemistry " 6th grade the questions that I am able to see is of maths and not of chemistry .

Explain why, iron sheets are coated with zinc.

To produce sulphuric acid by contact process they use h2so4 instead of water why?

Select from the following list:

$F{e}_2{O}_3,NO,PbO,M{n}_2{O}_7$.

(a) Basic oxide...........

(b) Amphoteric oxide ...........

(c) Acidic oxide ...........

(d) Neutral oxide...........

Match the following and choose the correct answer.
(i) Evaporation (a) Liquid to gas at a fixed temperature
(ii) Vaporisation (b) Solid to gas
(iii) Sublimation (c) Gas to solid
(iv) Hoar frost (d) Liquid into gas at any temperature

Write a combination reaction involving two gases.

Colour of methyl orange and phenolphthalein in basic medium

One of the following is not an allotrope of carbon. This is :
(a) diamond (b) graphite (c) cumene (d) buckminsterfullerene

Which of the following metals cannot be obtained from their compounds by heating with carbon?

What is isomerism?

Metals, non-metals and metalloids are present in the:

The correct order of electron affinity is:

Which of the following acid is a strong electrolyte?

State the reason why carbon can neither form $C^{4+}$ cations nor $C^{4-}$ anions but forms covalent compound
Also state the reason to explain why covalent compounds:
(i) Are bad conductors of electricity.
(ii) Have low melting and boiling points.

In the reaction, identify the reactant X.

Ethanoic acid

Name :

(a) a yellow monoxide that dissolves in hot and concentrated caustic alkali.
(b) a white, insoluble oxide that dissolves when fused with caustic soda or caustic potash.
(c) a compound containing zinc in the anion.

What makes vitamin C tastes sour?

The Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man:

(a) the excessive cutting down of forest plants and trees

(b) the excessive killing of large herbivores

(c) the excessive killing of large carnivores

(d) the excessive use of poisonous chemicals called herbicides

(a) Name one metal which is stored in kerosene oil.
(b) Name one non-metal which is stored under water.

Identify the structure of ethene from the given options.

For isomers having the same empirical formula, the compound with ___ branched chain has a ___ boiling point.

Which of the following is 2,2-dimethyl butane?

When Mendeleev made the periodic table, the number of elements discovered till then were __.