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WorksheetsCRT 1 (CBSE 10th)
Total questions: 25
Worksheet time: 45mins
Which of the following statements about the given reaction are correct?
1. Iron metal is getting oxidized
2. Water is getting reduced
3. Water is acting as reducing agent
4. Water is acting as oxidizing agent
1, 2 and 3
3 and 4
1, 2 and 4
2 and 4
Which of the following are exothermic processes?
1. Reaction of water with quick lime
2. Dilution of an acid
3. Evaporation of water
4. Sublimation of camphor (crystals)
1 and 2
2 and 3
1 and 4
3 and 4
Which among the following is (are) double displacement reaction(s)?
(i) and (iv)
(ii)
(i) and (ii)
(iii) and (iv)
Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is
1 : 1
2 : 1
4 : 1
1 : 2
In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?
Lead sulphate (insoluble)
Lead acetate
Ammonium nitrate
Potassium sulphate
Which among the following changes are exothermic or endothermic in nature?
Decomposition of ferrous sulphate
Dilution of sulphuric acid
Dissolution of sodium hydroxide in water
Dissolution of ammonium chloride in water
Which among the following are physical changes?
(multi correct question)
Evaporation of petrol
Burning of Liquefied Petroleum Gas (LPG)
Heating of an iron rod to red hot
Curdling of milk
It is necessary to balance a chemical equation in order to satisfy the law of:
Conservation of motion
Conservation of momentum
Conservation of energy
Conservation of mass
Rusting of iron involves a chemical reaction which is a combination of:
Reduction as well as combination reactions
Oxidation as well as combination reactions
Reduction as well as displacement reactions
Oxidation as well as displacement reactions
When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:
Blue to green.
Green to blue.
Green to brown.
Green to yellow.
This is a set up of :
Distillation of water
Purification of water
Electrolysis of water
Hydrolysis
a
b
c
d
For some integer m, every even integer is of the form
m
m + 1
2m
2m +1
n2 ‒1 is divisible by 8, if n is
an integer
a natural number
an odd integer
an even integer
If the HCF of 65 and 117 is expressible in the form 65m ‒ 117, then the value of m is
(a)
If two positive integers a and b are written as a = x3y2 and b = xy3 , where x, y are prime numbers, then HCF ( a, b) is
xy
xy2
x3y3
x2y2
The product of a non-zero rational and an irrational number is
always irrational
always rational
rational or irrational
one
The least number that is divisible by all the numbers from 1 to 10 (both inclusive)
(a)
.......
Terminating decimal expansion
Non-Terminating Non repeating decimal expansion
Non-Terminating repeating decimal expansion
None of these
Which of the following is not irrational?
(2 – √3)2
(√2 + √3)2
(√2 -√3)(√2 + √3)
None
If b = 3, then any integer can be expressed as a =
3q, 3q+ 1, 3q + 2
3q
none of the above
3q+ 1
There are 312, 260 and 156 students in class X, XI and XII respectively. Buses are to be hired to take these students to a picnic. Find the maximum number of students who can sit in a bus if each bus takes equal number of students
(a)
There is a circular path around a sports field. Priya takes 18 minutes to drive one round of the field. Harish takes 12 minutes. Suppose they both start at the same point and at the same time and go in the same direction. After how many minutes will they meet ?
(a)
The largest number which divides 60 and 75, leaving remainders 8 and 10 respectively, is
(a)
If HCF (16, y) = 8 and LCM (16, y) = 48, then the value of y is
24
16
8
48
