Explore topic-wise InterviewSolutions in .

(a) What is produced if an acid is added to a base?

(b) Why does dry HCl gas not change the color of dry litmus paper?

(c) What color does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?

Write complete balanced equations for the following reactions :

(a) Calcium (solid) + Water (liquid) $⟶$ Calcium hydroxide (solution) + Hydrogen (gas)

(b) Sulpher dioxide (gas) + Oxygen (gas) $⟶$ Sulphur trioxide (gas)

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution contains

The nodal plane in the $\pi$-bond of ethene is located in:

What are the various steps of the food chain called?

In general, covalent compounds

The total number of single bonds in a water molecule are:

What is precipitate?Please answer with a easy example of precipitate in a chemical reaction.

The enzyme that converts glucose into ethyl alcohol is

Identify the combination reactions among the following:

According to Huckel's rule, the number of π electrons to be taken while determining aromaticity in case of

The $I{P}_1,I{P}_2,I{P}_3,I{P}_4,I{P}_5$ of an element are 7.1, 14.3, 34.5, 46.8, 162.2 eV respectively. Which element among the following would that be?

(a) A gas cylinder contains 24 × 10²⁴ molecules of nitrogen gas. If Avogadro's number is 6 × 10²³ and the relative atomic mass of nitrogen is 14, calculate:

(i) Mass of nitrogen gas in the cylinder.

(ii) Volume of nitrogen at STP in dm³.



(b) Commercial sodium hydroxide weighing 30 g has some sodium chloride in it. The mixture on dissolving in water and subsequent treatment with excess silver nitrate solution formed a precipitate weighing 14.3 g.What is the percentage of sodium chloride in the commercial sample of sodium hydroxide? The equation for the reaction is

NaCl + AgNO₃ → AgCl + NaNO₃.

[Relative molecular mass of NaCl = 58; AgCl = 143]



(c) A certain gas 'X' occupies a volume of 100 cm³ at S.T.P. and weighs 0.5 g. Find its relative molecular mass.

Isobars have same.............. number but different ............... number.

The number of structural isomers of pentane is__.

PbS is the chemical formula for which mineral?

Conductivity of a solution of an electrolyte of concentration $0.1M$ filled in conductivity cell is $2.5S{m}^{-1}$. Resistance of this conductivity cell is $100ohm$. Resistance of the same cell when filled with $0.3M$ of the same solution is $800ohm$. The molar conductivity of $0.3M$ solution of the electrolyte will be:

Verma and Sharma were partners sharing profits in the ratio of 3 : 1 on 31-3-2011. Their Balance Sheet was as follows:

BALANCE SHEET OF VERMA AND SHARMA

as on 31-3-2011
$\begin{array}{cccc}\text{Liabilities}& \text{Amount}& \text{Assets}& \text{Amount}\\ & \text{(Rs)}& & \text{(Rs)}\\ \text{Capital :}& & \text{Land and Building}& 70,000\\ \text{Verma}1,20,000& & \text{Machinery}& 60,000\\ \text{Sharma}80,000& 2,00,000& \text{Debotrs}& 80,000\\ \text{Creditors}& 70,000& \text{Bank}& 60,000\\ & \overline{2,70,000}& & \overline{2,70,000}\end{array}$

The firm was dissolved on 1-4-2011 and the assets and liabilities were settled as follows :

(i) Creditors of Rs 50,000 took over land and building in full settlement of their claim.

(ii) Remaining creditors were paid in cash.

(iii) Machinery was sold at a depreciation of $30\%$

(iv) Debtors were collected at a cost of Rs 500.

(v) Expenses of realisation were Rs 1,700. Pass necessary Journal Entries for the dissolution of the firm.

Conversion of frost to water vapour is an example of

The product obtained when Iron reacts with dilute sulphuric acid is :

Complete the following reaction:

$2C{H}_{3}I+2Na\to ?+2NaI$

Explain the redox reaction with suitable example