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In an experiment,4.5 kg of fuel was burnt completely. The heat produced was measured to be 180,000 KJ .Calculate the calorific value of the fuel.

HOW IS PHOTOLYTIC DECOMPOSITION USED IN PHOTOGRAPHY?

Explain: 'Silver nitrate solution is kept in coloured reagent bottles in the laboratory.'

While studying saponification reaction for the preparation of soap, a teacher suggested to a student to add a small quantity of common salt to the reaction mixture. The function of common salt in this reaction is to

Complete and balance:

$\left(a\right)A{g}_{2}O\stackrel{△}{\to }\left(b\right)Mn{O}_2+Al\stackrel{△}{\to }\left(c\right)Cu\left(OH{)}_2\stackrel{△}{\to }\right(d\left)ZnC{O}_3\stackrel{△}{\to }\right(e\left)NaN{O}_3\stackrel{△}{\to }\right(f\left)Pb\right(NO{)}_2\stackrel{△}{\to }\left(g\right)AgN{O}_3\stackrel{△}{\to }\left(h\right)C{u}_{2}O+C{u}_{2}S\stackrel{△}{\to }\left(i\right)HgS+O_2\stackrel{△}{\to }$

How can we tell whether a base is strong or weak?

Which of the following condition(s) is/are correct for the formation of an electrovalent bond?

Question 2.1
Write the balanced equation for the following chemical reaction:
Hydrogen + Chlorine → Hydrogen chloride

Which molecule has a trigonal pyramidal shape?

Which of the following does not involve a chemical reaction ?

(a) digestion of food in our body

(b) process of respiration

(c) burning of candle wax when heated

(d) melting of candle wax on heating

Match the following compounds with their usage

$\begin{array}{cc}\text{Usage}& \text{Organic Compound}\\ \text{(i) Silk industry}& \text{(a) Power alcohol}\\ \text{(ii) Inner surface of cookware}& \text{(b) Teflon}\\ \text{(iii) Solvent in paint industry}& \text{(c) Methanol}\\ \text{(iv) Fuel in motor vehicles}& \text{(d) Ethanoic acid}\end{array}$

Which of the following is/are the property of an electrolyte?

How can the wastes such as paper, plastic and metal objects be disposed of?

Which of the following compound can form hydrogen bonds?

Hardness of water can be detected using:

A hydrocarbon with 5 carbons and there is a double bond between the $2^{nd}$ and the $3^{rd}$ carbons, what is it named as?

Question 44 (a)
Atomic number of a few elements are given below 10, 20, 7, 14. Identify the elements.

How can we convert baking soda to baking powder? What makes cakes so soft, spongy and fluffy?

Why it is advisable to freshly prepare Ferrous sulphate solution for experiments?

Which of these is neutral in nature?

Mole fractions of A and B in a mixture in which $6.023\times {10}^{23}$ molecules of A and $10.4\times {10}^{23}$ molecules of B are present are:

The second ionisation potential of a given atom is 12.08V. the ionisation potential must be

A) 12.08V

B) 13.6V

In this method of balancing chemical equations, trials are made to balance the equation by using the smallest whole number coefficient, the method is known as ___.

The following equation represents double displacement reaction,what is the precipitate in this reaction?

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

Nitrates do not react with dilute acids. A nitrate X reacts with both dil.HCl and dil.H₂SO₄ to form salts. Identify X?

During the formation of ammonia, the pressure of the system was raised. This results in the equilibrium shifting to the direction where there are __________ molecules.

To extract potassium $K$ from Karnalite ($KCl.MgC{l}_2.6H_{2}O$), the reduction process used is ___.

Which of the following is undergoing substitution reaction?

Atomic mass is defined as:

Which of the following cannot act as an indicator?

$400c{m}^3$ of a gas at 500 mm pressure is increased to $800c{m}^3$. Taking the temperature to remain unchanged, find the decrease in pressure.

In order to study saponification reaction, we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is

Which one of the following statements is not correct about the three states of matter i.e. solid, liquid and gaseous

The correct order of electric conductance at infinite dilution of LiCl, NaCl and KCl is

Which of the following statements is not correct about the trends when going from left to right across the periodic table?

Prepare a Common size Balance Sheet of the Xerox Ltd. Their Balance Sheet as at 31-03-2017 and 31-03-2018 was as follows:

$\begin{array}{ccc}\text{Particulars}& \text{31-03-2017}& \text{31-03-2018}\\ & \text{(Rs)}& \text{(Rs)}\\ I.\text{EQUITY AND LIABILITIES}& & \\ \left(1\right)\text{Shareholders' Funds:}& & \\ \text{(a) Share Capital}& 9,00,000& 12,00,000\\ \text{(b) Reserve and Surplus}& 4,00,000& 3,50,000\\ \left(2\right)\text{Current Liabilities :}& & \\ \text{(a) Trade Payables}& 2,00,000& 2,50,000\\ \text{Total}& 15,00,000& 18,00,000\\ II.\text{ASSETS}& & \\ \text{(1) Non-current Assets :}& & \\ \text{(a) Fixed Assets}& 10,00,000& 16,00,000\\ \text{(2) Current Assets}& 5,00,000& 2,00,000\\ \text{Total}& 15,00,000& 18,00,000\end{array}$

Complete and balance the following reactions, state whether dilute or conc. acid is used.
(a) $N{H}_{4}OH+HCl\to$

(b) $NaHS{O}_3+HCl\to$

(c) $Pb(N{O}_3{)}_2+HCl\to$

(d) $P{b}_3{O}_4+HCl\to$

(e) $Zn+HCl\to$

(f) $Ca(HC{O}_3{)}_2+HCl\to$

Which of the following is/are reduction reaction?

(a) What is "baking powder"? How does it make the cake soft and spongy?

(b) In addition to sodium hydrogen carbonate, baking powders contain a substance X. Name the substance X. What is the role of substance X in the baking powder?

Calcium Carbonate breaks into ___ at 1273K.