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What is Newland’s law of octaves? Explain with an example.

Zine oxide reacts with carbon, on heating, to form zinc metal and carbon monoxide. Write a balanced chemical equation for this reation. Name (i) oxidising agent, and (ii) reducing agent, in this reaction.

How does number of (i) valence electrons (ii) valency ;vary on the moving from left to right :

(a) in the second period of a periodic table ?

(b) in the third period of a periodic table ?

Which of the following represent a double displacement reaction?

Element x is electropositive and y is electronegative. Both elements are univalent, the compound formed by their combination will be

The ionic radii (in $A^{\circ }$ of $N^3,O^{2-}and{F}^{-}$ respectively are

What is a triad?

In the electroplating process, the object to be electroplated is made as___.

What happens when calcium reacts with water?

Vinegar is a solution of about :

(a) 5 to 8 per cent ethanoic acid in alcohol (b) 5 to 8 per cent ethanoic acid in water

(c) 50 to 80 per cent ethanoic acid in water (d) 50 to 80 per cent ethanoic acid in alcohol

100 sq cm of water gas is exploded with 100sq cm of oxygen and the residual gases are cooled to room temperature . Find the volume composition of the resulting mixture.

Identify the type of reaction.

M Ltd took over assets of Rs.9,00,00,000 and liabilities of Rs.70,00,000 of S Ltd and issued 8% Debentures of Rs.100 each. Record necessary entries in the books of M Ltd.

The given compound belongs to the family of

(a) Draw a labelled diagram for the laboratory preparation of hydrogen chloride gas.
(b) Give the balanced equation for the reaction.
(c) Name the drying agent used in drying hydrogen chloride gas.
(d) Phosphorus pentoxide and calcium oxide are good drying agents but they cannot be used to dry hydrogen chloride gas. Why?

What is the difference between chloride of lime and calcium chloride?

In modern periodic Law, the properties of the elements are a periodic function of their:

Alkali metals are characterized by:

bile and pancreatic juices change the pH of the chyme in the dudenum. what changes occurs in the pH? can you explain the requairements of changing the pH from the perspective of enzymes requirement as we saw in the previous question?

Among the given options, choose the correct option/s for the glass that is most commonly used to make laboratory glassware.

Which of the following ratio will be more than unity?

The Kelvin temperature scale is___.

The functional group present in ethanol is

An ionized gas contains both positive and negative ions. If it is subjected simultaneously to an electric field along the +x direction and a magnetic field along the +z direction, then

For each of the salt: A, B, C and D, suggest a suitable method for its preparation.

(a) A is a sodium salt.

(b) B is an insoluble salt.

(c) C is a soluble salt of copper.

(d) D is a soluble salt of zinc.

(a)What is the main application of Avogadro's Law?
(b) How does Avogadro's Law explain Gay-Lussac's law of combining volume?

A dilute solution of sodium carbonate was added to two test tubes – one containing dil $HCl$ (A) and the other containing dilute $NaOH$ (B). The correct observation was

The quantity of solute present in a given amount of solution represents :

Energy can exist in several forms and may change from one form to another.For each of the following,state the energy changes that occur in:

(a) the unwinding of a watch spring,

(b) a loaded truck when started and set in motion,

(c) a car going uphill,

(d) photosynthesis in green leaves,

(e) charging of a battery,

(f) respiration,

(g) burning of a match stick.

(h) explosion of crackers.

(a) Name the chemical compound which is electrolysed in a molten state to obtain aluminium metal. Which gas is evolved during this process?
(b) Name the chemical compound which is electrolysed in a molten state to obtain sodium metal. Which gas is produced in this process?
(c) Name the gas produced when calamine ore is calcined.
(d) Name the gas evolved when cinnabar ore is roasted.

What is the chemical name of washing soda? Name three raw materials used in making washing soda by Solvay process.

The number of elements in each of the long periods are__.

Even when the coating of zinc is broken, why is the galvanized article is still protected against rusting??

Which radiations are absorbed by the ozone layer?

Examples of decomposition reaction

Difference between soap and detergent?

Which of the following elements would lose an electron easily?

(a) Mg (b) Na (c) K (d) Ca

The X and Y form the above equation respectively are:

$C{H}_{3}COO{C}_2{H}_5$ $\stackrel{NaOH}{\to }$X + Y

A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:

(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water
(III) The beaker containing solution appears cold when touched from outside
(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :

A hydrocarbon with 6-Carbons in a chain can be named using which root word?

State two advantages of using disposable paper cups over disposable plastic cups.