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In brown ring test, a freshly prepared ferrous sulphate solution is used because:

Which of the following is the valence shell for the elements of the second period of the modern periodic table?

(a) M shell (b) K shell (c) L shell (d) N shell

The organic compounds having the same molecular formula but different structures are known as ..........

A crop field is termed as an artificial ecosystem. Why?

By the reduction of alkyl halides, we get alkanes. The best alkyl halide contains which halogen?

The things made up of aluminum develop an Al₂O₃ layer. It acts as a protective layer. But iron oxide layer does not behave like this. Why? Explain

Element A is in the $1^{st}$ group of the Modern Periodic Table. The formula of its ion will be :

The element having very high ionization enthalpy but zero electron gain enthalpy is

For one mole of a van der Waal's gas when b =o and T = 300 K, the PV vs $\frac{1}{V}$ plot is shown below. The value of the Van der Waal's constant "a" ($atm{L}^{2}mo{l}^{-2}$) is

What would happened to the railings on he road side if they are not painted ?why does it happen so?

Vapour density of a gas is 22. What is its molecular mass

Nitric acid belongs to the category of:

Which one of the following is incorrect?

Which of the following is true for the Modern periodic table?

Which of the following elements has the highest ionisation potential?

1. Write fully balanced equation when carbon dioxide is passed through ammonical brine solution.

Write the balanced chemical equation for the following reaction :

Zinc + Silver nitrate $⟶$ Zinc nitrate + Silver

What happens for the concentration of H+ ions on dilution?

The three elements predicted by Mendeleev from the gaps in his periodic table were known as eka-boron, eka-aluminium and eka-silicon. What names were given to these elements when they were discovered later on?

The IUPAC symbol for the element Rontgenium is:

Number of carbon and hydrogen atoms respectively in iso-butane respectively is

Conversion of ethanol to ethanoic acid is a/an:

The atomicity of Na is 1. What does it mean?

In the reaction $3Mn{O}_2+4Al\to 3Mn+2A{l}_2{O}_3$ the oxidising agent is

When copper turnings are added to silver nitrate solution, a blue coloured solution is formed after some time. It is because copper

Centchroman is a non-steroid substance used in which pill?

Why is it advised to add concentrated acid to water and not water to the acid?

What is difference between corrosion and rusting ?

Two gases methane and oxygen are mixed in an empty container at 25^oC the masses of both the gases are equal. Calculate the total pressure exerted by oxygen

LPG stands for liquefied petroleum gas. Varieties of LPG are marketed including a mixture of propane (60%) and butane (40%). If 10 litre of this mixture is burnt, find the total volume of carbon dioxide gas added to the atmosphere. Combustion reactions can be represented as:

Which of the following is the correct balanced chemical equation for the reaction of iron filings with steam?

Choose the correct answer from the choices A, B, C and D :

(i) The property which is characteristic of an electrovalent compound is that :

A. it is easily vaporized,

B. it has a high melting point,

C. it is a weak electrolyte,

D. it often exists as a liquid.

(ii) When a metal atom becomes an ion :

A. it loses electrons and is oxidized,

B. it gains electrons and is reduced,

C. it gains electrons and is oxidized,

D. it loses electrons and is reduced.

Find the percentage of
(a) oxygen in magnesium nitrate crystals $\left[Mg\right(N{O}_3{)}_{2}6H_{2}O]$.
(b) boron in $N{a}_2{B}_4{O}_7.10H_{2}O.[H=1,B=11,O=16,Na=23].$
(c) phosphorus in the fertilizer superphosphate $Ca(H_{2}P{O}_4{)}_2$

How do elements achieve octet configuration?

Vapour density of a gas is given by the ratio of

(a) Name the methods by which concentrated ore is converted to metallic oxide.

(b) State three objectives achieved during the roasting of ores.

Which of the following compounds is expected to be coloured?

(a) Of the two gases, ammonia and hydrogen chloride, which is more dense ? Name the method of collection of this gas.

(b) Give one example of a reaction between the above two gases which produces a solid compound.

(c) Write a balanced equation for a reaction in which ammonia is oxidized by :

(i) a metal oxide,

(ii) a gas which is not oxygen.

During the electrolytic extraction of Aluminium, purified alumina is mixed with $N{a}_3$ $Al{F}_6$ and $Ca{F}_2$. Why?

Given below are the elements with their atomic masses. Identify a set of elements which is not a Dobereiner's triad.

Find the neutral atom in the periodic table which has the same number of electrons as $K^{+}$ and $C{l}^{-}$. What is this number?

Question 11.
Common salt besides being used in kitchen can also be used as the raw material for making
(i) washing soda
(ii) bleaching powder
(iii) baking soda
(iv) slaked lime

Choose the correct option from the following:
(a) (i) and (ii)
(b) (i), (ii) and (iv)
(c) (i) and (iii)
(d) (i), (iii) and (iv)

How many valence electron does oxygen contain? How many electrons will it share with another oxygen atom?

During the production of sulphuric acid by the contact process, the three reactions represented by the equations below occur.

S(l) + O₂(g) → SO₂(g)

2SO₂(g) + O₂(g) → 2SO₃(g)

SO₃(g) + H₂SO₄(l) → H₂S₂O₇(l)

Which of the following statements is true for all three of these reactions?

Give formula of methly