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What mass of Ca will contain the same number of atoms as are present in 3.2 g of S?

Write balanced equations to satisfy each statement.

(a) Acid + Active metal $\to$ Salt + Hydrogen

(b) Acid + Base $\to$ Salt + Water

(c) Acid + Carbonate $\to$ Salt + Water + Carbon dioxide

or bicarbonate

(d) Acid + Sulphite or bisulphite $\to$ Salt + Water + Sulphur dioxide

(e) Acid + Sulphide $\to$ Salt + Hydrogen Sulphide

The atomic radius decreases as we move across a period because:

Arrange the following as per instructions given in the brackets.

(a) Mg. Cl, Na, S, Si (decreasing order of atomic size)

(b) Cs, Na, Li, K, Rb (increasing metallic character)

(c) Na, K, Cl, S, Si (increasing ionisation potential)

(d) Cl, F, Br, I (increasing electron affinity)

(e) Cs, Na, Li, K, Rb (decreasing electronegativity)

(a) Name an alloy of copper. State its chemical composition and anyone use.
(b) Name five methods of preventing rusting of iron.
(c) What are the constituents of stainless steel? What are the special properties of stainless steel?

The structure of D-(+)-glucose is

The structure of L-$(-)$-glucose is

You have a beaker containing a pale green solution of iron sulphate. What changes will you observe after you place a zinc rod in the beaker?

If the following orbitals are hybridized, then the number of hybrid orbitals will be:
$2s$, $2p_x$, $2p_y$, $2p_z$

The name the compound in the image:___

Match the statements in column A with that in column B.

Column A Column B

(a) deliquescent substance (i)sodium bicarbonate

(b) hydroscopic substance (ii) magnesium chloride

(c) efflorescent substance (iii) conc. sulphuric acid

(d) substance causing temporary (iv) washing soda hardness

Which gas is evolved when sodium metal reacts with water?

What is galvanisation ? How does it protect iron from rusting?

Fluorination is a\an ______ reaction.

A, B and C sharing profits equally, dissolved their firm on 30th June 2013, on which date their Balance Sheet was as follows :

$\begin{array}{cccc}\text{Capital and Liabilities}& \text{Amount (Rs.)}& \text{Assets}& \text{Amount (Rs.)}\\ \text{Sundry Creditors}& 31,000& \text{Bank}& 6,300\\ \text{Reserve for Contingency}& 18,000& \text{Debtors}& 55,000\\ \text{Profit \& Loss A/c}& 12,000& \text{Stock}& 81,000\\ \text{A's Wife Loan}& 12,000& \text{Furniture}& 20,000\\ \text{Bank Loan at}12\%& 20,000& \text{Plant}& 53,700\\ \text{Capital A/cs : A}& 60,000& \text{Current Account : C}& 22,000\\ \text{B}& 50,000& & \\ \text{C}& 20,000& & \\ \text{Current A/cs :}& & & \\ \text{A}& 10,000& & \\ \text{B}& 5,000& & \\ & \overline{\underset{–}{\underset{–}{2,38,000}}}& & \overline{\underset{–}{\underset{–}{2,38,000}}}\end{array}$

(1) There is a bill for Rs. 5,000 under discount. This bill was received from 'R'. R proved insolvent and 60% were received from his estate.

(2) It was found that an investment not recorded in the books is worth Rs. 8,000. This is taken over by one of the creditors at this value.

(3) A agreed to accept furniture in full settlement of his wife's loan.

(4) Bank Loan was repaid alongwith interest for nine months.

(5) Assets realised as follows : Debtors Rs 24,500; Stock Rs 60,000; Plant Rs 28,000. Prepare necessary accounts.

Which organic compound among the following is not an isomer of $C{H}_3-CO-C{H}_{2}C{H}_{2}C{H}_{2}C{H}_3$?

During the formation of ferric thiocyanate and potassium nitrate from ferric nitrate and potassium thiocyanate, the red color is due to the formation of

Give three uses of :
(a) methane

(b) ethane.

The colour of iron sulphate salt is :

How washing soda is obtained from baking soda write balanced chemical equation

What are the products obtained from reaction of baking soda and water?

Fluorine molecule is formed by sharing a pair of electrons by fluorine atoms. What kind of bond is formed?

The total mass of ${10}^{22}$ molecular units of $CuS{O}_4.5H_{2}O$ is nearly

Question 50
(a) Write the formula and draw electron dot structure of carbon tetrachloride
(b) What is saponification? Write the reaction involved in this process.

Dobereiner's triad arranged the elements with similar properties into:

Strong electrolytes are those which

Sushama took 2 beakers. In the first beaker she dissolved common salt and petrol and in the second beaker she dissolved common salt and Water. She observed that the contents do not dissolve in beaker 1. Why?

Chlorine was used as a chief chemical weapon in World War I due to its?

Question 4

Which of the following are exothermic processes?

(i) Reaction of water with quicklime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (iii) and (iv)

Which of the following metals is less reactive than hydrogen?

Statement 1: Metal oxides are also called as basic oxides.
Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

Pick the odd member from the list giving reasons :

(a) Ammonia, sulphur dioxide, hydrogen chloride, carbon dioxide.

(b) Copper oxide, aluminium oxide, sodium oxide, magnesium oxide.

Why should foodstuffs with acid components not be stored in metallic containers?

Choose the incorrect statement from the following for a Galvanic cell.

List some of the uses of bases.

Priya is working on a nitrate which gives metal, $N{O}_2$, and $O_2$ on heating. This nitrate is ___?

All metals above hydrogen in activity series:

What is the colour of Nitric Acid?

Internal combustion engines, nuclear reactors, hydroelectric power, tube lights, and gas stoves all are example to prove_______.

Question 41
Properties of the elements are given below. Where would you locate the following elements in the periodic table?

(a) A soft metal stored under kerosene.

(b) An element with variable (more than one) valency stored under water.

(c) An element which is tetravalent and forms the basis of organic chemistry.

(d) An element which is an inert gas with atomic number 2.

(e) An element whose thin oxide layer is used to make other elements corrosion resistant by the process of “anodizing”.

Obtaining Zn from zinc oxide is a process of: