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Why in laboratory acids are generally mixed with water to dilute them?

If E_f and E_b are the activation energies of the forward and reverse reactions and the reaction is known to be exothermic, then:

Statement 1: In the industrial areas gases like sulphur dioxide and nitrogen dioxide are present in large quantity.

Statement 2: The marble of Taj Mahal is fading away.

The highly reactive metals like sodium, potassium, magnesium etc are extracted by:

A student prepared the solutions of

1. an acid

2. a base in two separate beakers.

She forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?

Hydrochloric acid is acidic in aqueous solution because there are more ___ ions than ___ ions.

Name the ions present in CaS

You are given the following chemical equation :

$Mg\left(s\right)+CuO\left(s\right)⟶MgO\left(s\right)+Cu\left(s\right)$

This equation represents :

(a) decomposition reaction as well as displacement reaction

(b) combination reaction as well as double displacement reaction

(c) redox reaction as well as displacement reaction

(d) double displacement reaction as well as redox reaction

Consider the following complexes –

(i) $K_{2}PtC{l}_6$

(ii) $PtC{l}_4.2N{H}_3$

(iii) $PtC{l}_4.3N{H}_3$

(iv) $PtC{l}_4.5N{H}_3$

Their electrical conductance in aqueous solutions are:

Periods are __ (rows/columns) in the modern periodic table.

The diagram shows an apparatus for the laboratory preparation of hydrogen chloride.

(i) Identify A and B.

(ii) Write the equation for the reaction.

(iii) How would you check whether or not the gas jar is filled with hydrogen chloride?

(iv) What does the method of collection tell you about the density of hydrogen chloride?

Choose the correct option:

A solenoid of inductance $L=1\text{H}$ is connected across an AC supply of voltage, $V=100\sin \left(20t\right)$. The maximum energy stored in the solenoid is -

Why is aluminium containers used to transport nitric acid?

What type of isomerism is shown by 1-bromo propane and 2-bromo propane?

Why does magnesium powder reacts much more rapidly than magnesium ribbon with dilute sulphuric acid

$200c.c.$ of a gas measured at S.T.P. has a mass of $0.268g$. Molecular weight of the gas is

Which of the following reagents could be used to distinguish between dilute nitric acid and dilute hydrochloric acid?

Given that the standard potential ($E^{\circ }$) of $C{u}^{2+}/Cu$ and $C{u}^{+}/Cu$ are $0.340\text{V}$ and $0.522\text{V}$ respectively. The $E^{\circ }$ of $C{u}^{2+}/C{u}^{+}$ is:

Any chemical element (X) can be represented as${}_Z{X}^A$ where ‘Z’ is the atomic number and ‘A’ is the mass number. The Atomic number refers to the number of protons and the mass number refers to the sum of protons and neutrons in an atom. For an element, calcium which has 20 protons and 20 neutrons, identify the correct representation.

Group reagent for the precipitation of group II basic radicals for the qualitative analysis is :

Below is a flow chart describing the process of making rubber. Use it to help you copy and complete the process description that follows it. Remember to use the simple present tense, a mixture of actives and passives, and to add sequence markers where you see*

First rubber trees …….. in deep soil.*. When the trees …, fully ….., the bark of the tree …. and containers …. The latex …….. and is ……. to the factory. Here it ….. by treating it with acetic acid* the coagulated mass ….. It is then ….. into blocks or ….. into sheets. * …. in a current of warm air. Check: What tense did you use? Did you use sequence markers? Did you use a mixture of actives and passives?

Which of the following represents a possible food chain in a pound :

$\begin{array}{ccc}\text{Primary}& \text{Primary}& \text{Secondary}\\ \text{Producers}& \text{consumers}& \text{consumers}\\ \text{(a) green algae}& \text{fish}& \text{mosquito larvae}\\ \text{(b) fish}& \text{green algae}& \text{mosquito larvae}\\ \text{(c) mosquito larvae}& \text{fish}& \text{green algae}\\ \text{(d) green algae}& \text{mosquito larvae}& \text{fish}\end{array}$

On the basis of their position in the periodic table, maximum metallic character is present in which element :

Name a compound prepared by ammonia and is used as :

(a) Explosive, (b) Fertilizers,

(c) Medicine, (d) Laboratory reagent.