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Metallic nature and basic nature of the oxides _____ as we move along a period

Aluminium is obtained by the electrolysis of its oxide, __.

Explain some chemical properties of carbon and its compound.

What current strength would be required to produce hydrogen gas at the rate of $1.12c{m}^3{s}^{-1}$(STP) by the electrolysis of aqueous NaCl solution with 96.5% current efficiency ?

In the following reaction:

the product A is:

One molecule of hydrated CuSO₄ contains:

Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound. But, both conduct electricity in their aqueous solutions. Explain.

From the given table, identify the set of metals cannot be obtained by carbon reduction.

Four samples are prepared by adding:
A. a pinch of copper sulphate to water
B. a spatula of copper sulphate to water
C. a spatula of chalk powder to water
D. milk to water
Which among these is not a suspension?

Give reasons for the following –
a) Why is sodium kept immersed in kerosene oil?
b) Why calcium metal after reaction with water starts floating on it?
c) Why plaster of Paris should be stored in a moisture proof container?
d) Why is baking soda used as an antacid?
e) Why does an aqueous solution of acid conduct electricity?

Question 42
An element is placed in 2nd Group and 3rd Period of the Periodic Table, burns in presence of oxygen to form a basic oxide.

(a) Identify the element.

(b) Write the electronic configuration.

(c) Write the balanced equation when it burns in the presence of air.

(d) Write a balanced equation when this oxide is dissolved in water.

(e) Draw the electron dot structure for the formation of this oxide.

The number of malaria patients in a village increased tremendously when a large number of frogs were exported from the village. What could be the cause for it? Explain with the help of food chain.

Urea is a very important nitrogenous fertilizer. Its formula is $CO{N}_2{H}_4$ Calculate the percentage of nitrogen in urea (C = 12, O = 16, N = 14 and H = 1).

Johann Dobereiner classified elements in group of three elements called as

The number of covalent bonds in pentane (molecular formular $C_5{H}_{12}$) is :
(a) 5 (b) 12 (c) 17 (d) 16

Exothermic Vs endothermic reactions (with examples)

In acid solution, the reaction

MnO₄^- → Mn²⁺ shows:

Salicyclic acid is treated with bromine under two different conditions.

Predict the nature of [X] and [Y] in the above reactions

In propane, the number of Carbon-Carbon single bond is/are:

Some organic compounds are given. Identify alcohol from the following.

Why should we balance a chemical equation?

Match Column I with Column II with reference to Haber's process:

$$\begin{array}{ccccc}& ColumnI& & ColumnII& \\ A.& Medicine& p.& AmmoniumNitrate& \\ B.& LaboratoryReagents& q.& AmmoniumSulphate& \\ C.& Fertilizers& r.& AmmoniumSolution& \\ D.& Explosive& s.& AmmoniumCarbonate& \end{array}$$

Which of the following statement(s) is/are not true regarding a covalent bond?

Select the correct statement regarding the influence of catalyst on chemical equilibrium.

The IUPAC name of the compound $C_2{H}_5-\underset{C{H}_2}{\underset{||}{C}}-C{H}_{2}OH$ is

Temperature of ice at 0⁰C does not change inspite of heating it, till it melts completely. Why?

The following equation represents the double displacement reaction.What is the precipitate formed in this reaction?

$AgN{O}_3\left(aq\right)+NaI\left(aq\right)\to AgI\left(s\right)+NaN{O}_3\left(aq\right)$

RI of diamond wrt air is 2.4 & glass w.r.t. air is 1.5. Calculate the RI of diamond wrt glass.

(a) What do you understand by amphoteric oxide ? (b) Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali. (c) Name the products formed.

(a) What is corrosion? What are the necessary conditions for corrosion?

(b) State under what conditions corrosion is faster.

(c) Corrosion can be an advantage in some cases.Explain.

A lorry carrier measures 10 m × 7 m × 5 m. Find the maximum number of wooden crates each measuring 1.5 m × 1.25 m × 0.5 m that can be transported.

Unsaturation in the organic compound can be tested by the help of :

(a) In the modern periodic Table, why does cobalt with a higher atomic mass of 58.93 appear before nickel having a lower atomic mass of 58.71?

(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

Name the group of chemical compounds which damages the ozone layer.

What do you understand by Mole? If 8.4 g X element includes $9.03\times {10}^{22}$ atoms and 0.1 mol $X_2{Y}_3$ compound is 16g, find atomic mass of Y element. (Avogadro number is $6.02\times {10}^{23})$ [5 MARKS]

Choose the best option regarding ester:

Statement 1: Ester is formed due to the reaction between ethanol and ethanoic acid.

Statement 2: Esters are sweet smelling substances.

Statement 3: Ester are formed due to the reaction between an acid and a carboxylic acid.

Statement 4: On treating with sodium hydroxide, ester is converted back to alcohol and sodium salt of carboxylic acid.

Statement 5: Preparation of soap involves treating sodium hydroxide with ester.

How is : (a) methane and (b) ethane prepared in the laboratory?

Which of these is/are not an application of electrolysis?

If an compound has 3 carbon atoms. Then how many different carbon skeleton are possible?

The incorrect physical property of sulphuric acid from the following is :

Question:

(a) A solution has a pH of 7. Explain how you would :

(i) increase ist pH; (ii) decrease its pH;

(b) If a solution changes the colour of litmus from red to blue, what can you say about its pH?

(c) What can you say about the pH of a solution, that liberates carbon dioxide from sodium carbonate ?

A certain alkaloid has 70.8% C,6.2% H and 4.1% N and rest O. The empirical formula of the alkaloid is

Name :

(a) a chloride which is insoluble in cold water but dissolves in hot water,

(b) a chloride which is insoluble,

(c) two sulphates which are insoluble,

(d) a basic salt,

(e) an acidic salt,

(f) a mixed salt,

(g) a complex salt,

(h) a double salt,

(i) a salt whose solubility increases with temperature,

(j) a salt whose solubility decreases with temperature.

Find the :
(a) Number of molecules in 73 g of HCl,
(b) Weight of 0.5 mole of $O_2$ ,
(c) Number of molecules in 1.8 g of $H_{2}O,$
(d) Number of moles in 10 g of $CaC{O}_3$
(e) Weight of 0.2 mole fo $H_2$ gas,
(f) Number of molecules in 3.2 g of $S{O}_2$

Select two non-biodegradable substances from the following waste generated in a kitchen: Spoilt food, paper bags, milk bags, vegetable peels, tin cans, used tea leaves.

Which of the following is true about dilute sulphuric acid?