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Which of the following gas burns with a pop sound?

An element X has 7 electrons in its L shell. What is true about the element X?

I. It belongs to period 9 of modern periodic table.

II. Its atom contains 9 protons.

III. It has a valency of 7.

IV. Its atoms can accept an electron to acquire noble gas configuration.

Which of the following is not transported through a pipeline?

A metal is released in the electrolysis of a salt. It gets deposited on the:

Explain the trends in physical properties(point wise)

A.atomic radius (point wise)

B.Ionic radius (point wise)

C.Ionization Enthalpy (point wise)

D.Electron Gain Enthalpy (point wise)

E.Electronegative (point wise)

Do we get zinc from nature? If yes then from which substance?

A strip of copper was placed in a beaker containing zinc sulphate solution. On observing the strip next day, it was noticed that:

Which of the following phenomenon we can observe in part A of the figure given below.

You're given the equations, $\frac{c}{d}=\frac{d}{e}$ & $\frac{l}{m}=\frac{m}{n}$. Identify the mean proportionals of both.

The number of gram molecules of oxygen in $6.02\times {10}^{24}$ CO molecule is

pH of a solution is 5. Its hydroxyl ion concentration is

(a) (i) LPG stands for liquefied petroleum gas. VArieties of LPG are marketed including a mixture fo 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 cab be represented as:
$C_3{H}_{8\left(g\right)}+{50}_{2\left(g\right)}\to 3C{O}_{2\left(g\right)}+4H_2{O}_{\left(g\right)}2C_4{H}_{10\left(g\right)}+13O_{2\left(g\right)}\to 8C{O}_{2\left(g\right)}+10H_2{O}_{\left(g\right)}$
(ii)
Calculate the percentage of nitrogen and oxygen in ammonium nitrate. [Relative molecular mass of ammonium nitrate is 80, H = 1, N = 14, O = 16].
(b)4.5 moles of calcium carbonate are reacted with dilute hydrochloric acid.
(i) Write the equation for the reaction .
(ii) What is the mass of 4.5 moles of calcium carbonate ? (Relative molecular mas of calcium carbonate is 100).
(iii) What is the volume of carbon dioxide liberated at STP?
(iv) What mass of calcium chloride is formed?
(Relative molecular mass of calcium chloride is 111).
(v) How many moles of HCl are used in this reaction?

Metal A has an electronic configuration of 2,8,1 and metal B has 2,8,8,2 which is a more reactive metal.

(a) Identify A and B and give their reactions with dil.HCl and dil.$H_{2}S{O}_4$.

(b) Give the effect of heat on their:

(i) oxides, (ii) hydroxides,

(iii) carbonates, (iv) nitrates.

The unique type of bonds found in Nucleic acids, formed due to the condensation at the phosphorus end, are called _____.

Which gas is evolved when acids react with metal carbonates?

During Electrolysis of NaCl,

NaCl is taken in molten state so it conducts eletricity because of the free electrons, so why are the free electrns present only in its molten state and not in its solid state and therefore resulting in soid NaCl not conducting electricity.

Lemonade is prepared by mixing lemon juice and sugar in water. You wish to add ice to cool it. Should you add ice to the lemonade before or after dissolving sugar? In which case would it be possible to dissolve more sugar? Does water dissolve an equal amount of salt and sugar? What can be done to dissolve more salt in a saturated solution of water and salt? Name two other things that dissolve in water. [5 MARKS]

How many moles of hydrogen atoms are present in 1 mole of $H_{2}O$?

During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium (b) tin (c) zinc (d) copper

Which of the electrodes is at a higher potential in a voltaic cell using copper and zinc rods as electrodes and dilute $H_2{SO}_4$​ as an electrolyte?

Explain the manufacture of ethanol from molasses.

A pale yellow precipitate soluble in ammonium hydroxide solution indicates the presence of:

Which of the following is the correct order of decreasing atomic radius

A compound is formed when elements X and Y chemically combine with each other. X has a valency of 6 and Y has a valency of 4. The molecular formula of the compound will be _______.

From the list of given metals, which is the most ductile metal?

In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?

The reaction of dissociation of potassium hydroxide which is a strong base in aqueous solution is:

Explain the gradation in properties (valency, metallic and non metallic character) of elements in the modern periodic table. [3 MARKS]

Which of the following equation is balanced?

The colour of an aqueous solution of Zinc sulphate as observed in the laboratory is:

What happens when a cold and concentrated solution of sodium chloride reacts with ammonia and carbon dioxide? Write the chemical equation of the reaction which takes place.

Explain the meaning of malleability and ductility? [3 MARKS]

Which group of elements in the modern periodic table are referred as 'alkaline earth metals'?

What is a base? Give one example. [2 MARKS]

What volume of oxygen at STP is required to affect the combustion of 1 litres of ethylene $\left[C_2{H}_4\right]$ at ${273}^{\circ }C$ and 380 mm of Hg pressure?
$C_2{H}_4+3O_2\to 2C{O}_2+2H_{2}O$

State the effect of :

(a) an endothermic reaction.

(b) an exothermic reaction on the surroun dings.

ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C{H}_2$ - group.

Why sulphur trioxide formed in absorption tower in contact process is not absorbed directly in water

comment on the nature of bonds present in a molecule of XY when you have these additional information

1) the compound exist in the solid state.

2)it has a very high melting point.

3)its aqueous solution makes an excellent electrolyte.

Sodium chloride does not exist as molecules but aggregates of oppositely charged ions.explain

Why is chemical equation is calcium carbonate and marble the same?