Explore topic-wise InterviewSolutions in .

Complete the folllowing blands in the equation as indicated.
$Ca{H}_2\left(s\right)+2H_{2}O\left(aq\right)\to Ca\left(OH{)}_2\right(s)+2H_2(g)$
(a) moles : $1mole+\cdots \to \cdots +\cdots$
(b) Grams: $42g+\cdots \to \cdots +\cdots$
(c) Molecules : $6.02\times {10}^{23}+\cdots \to \cdots +\cdots$

Consider the following elements :

${}_{20}Ca{,}_{8}O,{}_{18}Ar,{}_{16}S,{}_{4}Be,{}_{2}He$

Which of the above elements would you expect to be :

(i) very stable? (ii) in group 2 of the periodic table?

(iii) in group 16 of the periodic table ?

Out of the following options, which two gases change the colour of damp red litmus paper?

The tenth elements in the periodic table resembles with the

Write the general equation for combustion of ammonia

Which of the following is an incorrect assumption for the kinetic theory?

(a) What is a universal indicator? For what purpose is it used?

(b) How does a universal indicator work?

(c) Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?

Which of the following is the correct mathematical representation of Charles's Law?

What is the atomicity of oxygen?

Zinc nitrate reacts with ammonium hydroxide to give a white gelatinous precipitate of X which is soluble in excess of ammonium hydroxide. What is X?

State the observation and give a balanced equation .

excess of ammonium hydroxide is added to a substance obtained by adding HCl in Silver nitrate solution.

Why is CuSO₄ the expected formula of Copper Sulphate and not Cu₂SO₄ when Copper has variable valency of Cu⁺ and Cu²⁺ ; Here the higher valency is used for the salt.

However in the case of Iron Sulphate the expected formula is FeSO₄ and not Fe₂(SO₄)₃ eventhough Iron also has variable valency of Fe²⁺ and Fe³⁺ ; Here the lesser valency is used for the salt.

The substances which are capable of adding oxygen to other substances are called___.

_{A drop of water is poured over a white powdery substance. Then it is observed that the substance turns blue. Answer the following questions :}

_{(i) What is the white powdery substance?}

_{(ii) Why does the substance change to blue colour?}

_{(iii) Write the chemical formula of the blue substance .}

_{(iv) Is the blue substance an acidic salt or a basic salt?}

_{(v) Give a reason for your answer in (iv).}

What are the differences between displacement and double displacement reactions ?

How to balance a chemical equation by partial method

Magnesium ribbon burns in air to produce white substance called magnesium oxide. Which type of reaction is this?

What happens when dilute sulphuric acid is added to zinc granules? Select the correct option.

A weak base BOH is titrated with a strong acid HA. When 10ml of HA is added, the pH is found to be 9.00 and when 25 ml is added, pH is 8.00. The volume of the acid required to reach the equivalence point

State on what special properties the use of each of these metals depends:

(a) aluminium, (b) zinc?

Copy and complete the following table :

$\begin{array}{ccc}\text{Column 1}& \text{Column 2}& \text{Column 3}\\ \text{Substance reacted}& \text{Dilute or}& \text{Gas}\\ \text{with acid}& \text{Concentrated}& \\ & \text{acid}& \\ & & \text{Hydrogen}\\ & & \text{Carbon dioxide}\\ & & \text{Only chlorine}\end{array}$

Find the number of electrons that can be accommodated in K-shell of an atom.

(a) What is the fundamental difference in the electronic configurations between the group 1 and group 2 elements?

(b) On the basis of electronic configuration, how will you identify :

(i) chemically similar elements?

(ii) the first element of a period?

Match the following statements

$\begin{array}{cc}\text{(a)f block elements}& \left(i\right)Group1and2\\ \text{(b)d block elements}& \left(ii\right)Group13to17\\ \text{(c)p block elements}& \left(iii\right)Group3to12\\ \text{(d)s block elements}& \left(iv\right)LanthanidesandActinides\end{array}$

2 gram of Lead Nitrate powder is taken in a boiling tube. The boiling tube is heated over a flame. Now answer the following

(A) State the colour of the fumes evolved and the Residue left.

(B) Name the type of chemical reaction that has taken place stating its balanced chemical equation

Which of the following non-metal is a liquid?
(a) carbon

(b) sulphur

(c) bromine

(d) iodine

The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was :
(a) glucose (b) urea (c) uric acid (d) vinegar

When a non-metal reacts with oxygen, it forms a non-metallic oxide. This non-metallic oxide when reacted with $H_{2}O$, form a substance, ‘X’ with pH value less than 7. Select the correct option regarding the substance, ‘X’.

1. 109.5

Protein-coated fat globules are called:

Which of the following processes is/are pyrometallurgical?

Consider various species generated when $H_{3}P{O}_4$ is dissolved in water. According to the Bronsted Lowry’s Concept among these, the conjugate acid of $HP{O}_4^{2-}$ is :

Avogadro's Law assumes :