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Which of the following can form Dobereiner’s Triads: with Li(u = 6.9) and Na(u = 23)?

Which of the following formulae is/are correct to calculate the number of moles?

Write the chemical formula of ammonium chloride. Explain why an aqueous solution of ammonium chloride is acidic in nature? Illustrate your answer with the help of a chemical equation.

Name the salt which on hydrolysis forms

(a) acidic (b) basic and

(c) neutral solution. Give a balanced equation for each reaction

There is an element X with atomic number 16. A student was assigned a task to write down the features of the group to which this element belongs to. Help him find the group number of the element X so that he can complete his task.

Which of the following is/are poor conductors of heat?

Acetic acid smells like:

The major function of bacteria and fungi in an ecosystem is _____

Write the formulae of (a) methanoic acid, and (b) ethanoic acid.

What is the nature of the C-Cl bond in $CC{l}_4$ ?

How many valence electrons does oxygen have?

Choose the correct option regarding the uses of washing soda.

State the modern periodic law. Name the scientist who stated this law.

Gravity separation is also called __

The correct order of atomic size of $C,N,P,S$ is

The Dead Sea contains many dissolved salts and so people can easily float on it. Therefore Dead Sea is a ________ solution.

A lead storage battery containing 5.0L of $H_{2}S{O}_4$ solution is operated for $9.65\times {10}^{5}s$ with a steady current of 100 mA. Assuming volume of the solution remains constant, normality of $H_{2}S{O}_4$ will :

State the difference between Covalent Bonds and Ionic Bonds.

Calculate the atomic mass of $S$ - atom in grams?

Statement 1: Carbon always forms covalent bond with other elements.
Statement 2: $C^{+4}$ and $C^{-4}$ ions are highly unstable.

Difference between $n^{th}$ and $(n+1{)}^{th}$ Bohr's radius of `H' atom is equal to it's $(n-1{)}^{th}$ Bohr's radius. The value of n is approximately ___.

Roasting is used to process which of the following ores?

Which of these chemical equations is not balanced?

The atomic numbers fo four elements A, B, C and D are 6, 8, 10 and 12 respectively. The elements which can react to form ionic bonds (or ionic compound) are:
(a) A and D

(b) B and C

(c) A and C

(d) B and D

One of the following is a medicine for indigestion. That is:

(a) sodium hydroxide

(b) manganese hydroxide

(c) magnesium hydroxide

(d) potassium hydroxide

If the number of hydrogen atoms in an alkene is 16, then what is the name of this hydrocarbon compound?

Concentrated nitric acid, upon long standing, turns yellow–brown due to the formation of

An aqueous solution with pH = 0 is

Name the following:

(a) A metal which is liquid at room temperature.

(b) The process of heating an ore to a high temperature in the presence of air.

(c) The compound formed by the reaction between calcium oxide and silica.

(d) A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.

(e) Name an allotrope of a non-metal that allows electricity to pass through it.

Which of the two metals is more reactive: Copper or Silver?

What is observed when excess of ammonia is passed through an aqueous solution of lead nitrate.

Which of the following metals occur in the free or native state?

Which of the following is a sulphide ore of copper?

Identify the molecular formula of dimethyl ether from the given compounds.

One electrolysing $K_{2}S{O}_4$ solution using inert electrodes, 1.68L (STP) of gases was obtained. How many moles of $Mn{O}_4^{-}$ could be reduced to $M{n}^{2+}$ by the same quantity of electricity ?

The number of atoms in 4.25 g of $N{H}_3$ is approximately

Second electron gain enthalpy

Rusting of iron is a chemical change because