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What do you understand by Mole? . If, 8.4 g X element includes $9.03\times {10}^{22}$ atoms and 0.1mol $X_2{Y}_3$ compound is 16g find atomic mass of Y element. (Avogadro number is $6.02\times {10}^{23})$ [5 MARKS]

The major cause for depletion of ozone layer in stratosphere is due to the

In the species

i) 4.0g of $NaOH$ ii) 4.8g of $S{O}_2$

iii) 4.0 g of $C{O}_2$ iv) 2.8 g of $CaO$,

decreasing order of the weight of oxygen is

Which of the following is not a non-biodegradable material?

(a) nylon socks

(b) plastic school bag

(c) jute carry bag

(d) polyester clothes

The information given below describes the properties of particles of a certain type of mixture.
1. The particles do not have fixed positions and are spread out quite uniformly.
2. The particles move freely and slide past one another
3. When a laser beam is passed through it, it clearly shows the path of the laser beam.
Which of the following shows the given properties?

What happens when 1,2-dibromoethane is boiled with alcoholic potassium hydroxide?

Which of the following salt solutions ($0.1M$ each) will have the lowest pH values?

Which material was used by the Harappans for making vessels?

The functional group present in propanal is :
(a) $-OH$ (b) $-COOH$ (c) $-CO-$ (d) $-CHO$

Which of the following has coordinate bond?

State Mendeleev's periodic law.

Complete the following reaction:
$C{H}_{3}C{H}_{2}OH+2\left[O\right]\underset{KMn{O}_4}{\overset{alk}{\to }}{H}_{2}O+$ ___ .

Ozone at the higher levels of the atmosphere is a product of UV radiation acting on the _______ molecules.

Which of the following is the most malleable metal?

The C-C bond length is minimum in ___

Question 22

A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
(a) What changes do you expect?
(b) Are these changes chemical in nature?
(c) Write a word equation for the chemical change, if any.

Zinc oxide reacts with both NaOH and HCl, thus it is called ________.

Which one of the following is used to make non-stick cookware

On heating, Carbonates of mercury and silver decompose into ___ .

50 mL of $H_2$ gas diffuses through a small hole from a vessel in 20 min. Time taken by 40 mL of $O_2$ gas to diffuse under similar conditions will be :

The molarity of the solution containing 2.8% mass-volume solution of KOH. (Given atomic mass of K = 39) is

The order of stability of cyclohexane conformations is :

(a) How do alkaline earth metals occur in nature ?

(b) Write the electronic configuration of the first two alkaline earth metals.

Soil helps to-

The name of the following compound is :

Name the metal which is extracted from the ore called 'Rock salt'
(b) Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
(c) Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equation of the reactions involved.
(d) In the electrolytic refining of a metal M, what would you tak eas anode, cathode and electrolyte?
(e) Name any five metals which are purified by electrolytic refining method.

Ammonia is a strong _______ (oxidizing/reducing) agent.

Select the reaction which is not an exothermic reaction?

Write a note on Aqua Regia? Give one use of it?

Which of these are true about ionic compounds?

Na2CO3+Hcl,_______≥NaCL+NaHCO3. Na2CO3+HcL________≥NaCL+H2o+CO2 why is it written like that ,is this equation both write?

If $0.5mole$ of $BaC{l}_2$ is mixed with $0.2mole$ of $N{a}_{3}P{O}_4$, the maximum number of moles of $B{a}_3(P{O}_4{)}_2$ formed are

3,7-Dimethylocta-1,3,6-triene is the IUPAC name of which of the following compounds?

If W is atomic weight and N is the atomic number of an element, then

When water is added to quicklime rise in temperature is observed. This is an example of _______ reaction.

Can can you give me list of 20 elements of periodic table which we use in our day to day life with their uses

Which among the following in a food chain flows unidirectionally?

Which of the following anion is colourless?

34 gm of Ammonia is decomposed to _________ gm of Nitrogen and _____ gm of Hydrogen, _____ is the ratio of hydrogen to nitrogen by mass. The options in blanks are respectively

Which of the following is/are the uses of chlorine?

Copper sulphate solution (250 ml) was electrolyzed using a platinum anode and copper cathode. A constant current of 2 mA was passed for 16 minute. It was found that after electrolysis, the absorbance of the solution was reduced to 50% of its original value. Calculate the concentration of copper sulphate ion in the solution to begin with.

In electrolysis, oxidation takes place at ___